CN109301164A - Multidimensional lithium ion battery negative electrode sheet and preparation method thereof - Google Patents
Multidimensional lithium ion battery negative electrode sheet and preparation method thereof Download PDFInfo
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
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Abstract
The present invention provides a kind of multidimensional anode plate for lithium ionic cell, the multidimensional anode plate for lithium ionic cell is the combination electrode of layer structure, including negative current collector, in the graphene quantum dot layer of negative current collector surface fitting setting, in the graphene quantum dot layer away from the silicon material layer of the surface of negative current collector fitting setting, the carbon material layer of the surface fitting setting far from the graphene quantum dot layer is carried on the back in the silicon material layer, carries on the back the ceramic layer of the surface fitting setting far from the silicon material layer in the carbon material layer.Multidimensional negative electrode of lithium ion battery provided by the invention, effectively can inhibit silicon to expand, and solve lithium ion battery silicon and alleviate the solution serious bulk effect of silicon materials, improve the cycle performance of lithium ion battery.
Description
Technical field
The invention belongs to technical field of lithium ion more particularly to a kind of multidimensional anode plate for lithium ionic cell and its preparations
Method.
Background technique
Due to the raising of electric car course continuation mileage, the requirement to battery capacity is also higher and higher, existing graphite-like material
Expect the battery core requirement for having been unable to meet high capacity as negative electrode of lithium ion battery, therefore develops new negative electrode material system and compel in eyebrow
Eyelash.Silicon is not easy to cause Li dendrite in electrode surface due to its high capacity, metastable embedding lithium structure, high discharge platform
The main object that the advantages that formation is studied as everybody.But after embedding lithium, the volume expansion of silicon is up to 300%, leads to silicon materials
It is excessively poor as negative electrode of lithium ion battery cycle performance.
Summary of the invention
The purpose of the present invention is to provide a kind of multidimensional anode plate for lithium ionic cell and preparation method thereof, it is intended to solve existing
Anode plate for lithium ionic cell silicon materials bulk effect it is serious, the problem of influencing negative electrode of lithium ion battery cycle performance.
For achieving the above object, The technical solution adopted by the invention is as follows:
One aspect of the present invention provides a kind of multidimensional anode plate for lithium ionic cell, and the multidimensional anode plate for lithium ionic cell is layer
The combination electrode of shape structure, including negative current collector, the graphene quantum dot layer that fitting is arranged on the negative current collector surface,
In the graphene quantum dot layer away from the silicon material layer of the surface of negative current collector fitting setting, in the silicon material layer
The carbon material layer for carrying on the back the surface fitting setting far from the graphene quantum dot layer, is carried on the back in the carbon material layer far from the silicon material
The ceramic layer of the surface fitting setting of the bed of material.
Preferably, the thickness of the graphene quantum dot layer is less than or equal to 5 nanometers.
Preferably, the silicon material layer is at three-dimensional net structure.
Preferably, the silicon material layer with a thickness of 10-20 microns.
Preferably, the material of the silicon material layer is selected from least one of silicon-carbide particle, silicon carbide fibre.
Preferably, the ceramic layer with a thickness of 1-8 microns.
Preferably, the average grain diameter of ceramic particle is 0.2-1 microns in the ceramic layer.
And another aspect of the present invention provides a kind of preparation method of multidimensional anode plate for lithium ionic cell, including following step
It is rapid:
Negative current collector is provided, graphene quantum dot is deposited on the negative current collector surface, prepares graphene quantum dot
Layer；
Silicon materials are coated away from the surface of the negative current collector in the graphene quantum dot layer, form silicon material layer；
Deviate from the surface depositing carbon material of the graphene quantum dot layer in the silicon material layer, prepares carbon material layer；
Deviate from the surface deposit ceramic materials of the silicon material layer in the carbon material layer, prepares ceramic layer.
Preferably, graphene quantum dot layer is prepared using the method for pressure atomization, specific method the following steps are included:
Configuration quality percentage composition is the graphene quantum dot solution of 1%-5%；
By spray gun graphene quantum dot solution described in the negative current collector surface pressing atomizing spraying, graphite is formed
Alkene quantum dot layer.
Preferably, the preparation method of the silicon material layer includes:
After the graphene quantum dot layer surface depositing silicon, hot-pressing processing is carried out, silicon materials is made to be in three dimensional network
Network structure, the silicon material layer that there is three-dimensional net structure through being dried preparation.
Multidimensional anode plate for lithium ionic cell provided by the invention is the combination electrode of layer structure, is included in negative pole currect collecting
Graphene quantum dot layer, silicon material layer, carbon material layer and the ceramic layer of setting are successively bonded on body.It has the advantage that
Firstly, the present invention uses graphene quantum dot as priming coat (graphene quantum dot layer), cathode collection can be increased
The corrosion resistance of fluid, improves the migration rate of lithium ion, while improving adhesion strength of the silicon materials on negative current collector, effectively
Solve the problems, such as silicium cathode piece poor adhesion.
Secondly, the present invention by silicon material layer and carbon material layer setting the quantum dot graphene layer and the ceramic layer it
Between, and the silicon material layer is bonded the quantum dot graphene layer and is arranged, it, can by carbon material layer fitting ceramic layer setting
With the small outside expansion to inhibit silicon materials of the volume change using carbon material, the serious bulk effect of silicon materials is reduced.
Again, the present invention is that ceramic layer is arranged in the position far from negative current collector in outermost layer, and the ceramic layer can not only
Pole piece is improved to the wetability of electrolyte, and the ceramic layer has preferable thermal insulation, can prevented in battery charging and discharging
Only Fire explosion caused by high-temperature battery short circuit, promotes the security performance of battery.
To sum up, multidimensional negative electrode of lithium ion battery provided by the invention, effectively can inhibit silicon to expand, and solve lithium ion battery
Silicon, which is alleviated, solves the serious bulk effect of silicon materials, improves the cycle performance of lithium ion battery.
The preparation method of multidimensional anode plate for lithium ionic cell provided by the invention need to be only sequentially prepared on negative current collector
Graphene quantum dot layer, silicon material layer, carbon material layer and ceramic layer, method are relatively simple, it is often more important that, what is obtained is more
Negative electrode of lithium ion battery is tieed up, effectively silicon can be inhibited to expand, lithium ion battery silicon is solved and alleviates the solution serious volume of silicon materials
Effect improves the cycle performance of lithium ion battery.
Specific embodiment
In order to which technical problems, technical solutions and advantageous effects to be solved by the present invention are more clearly understood, below in conjunction with
Embodiment, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used to explain
The present invention is not intended to limit the present invention.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include one or more of the features.In the description of the present invention,
The meaning of " plurality " is two or more, unless otherwise specifically defined.
On the one hand the embodiment of the present invention provides a kind of multidimensional anode plate for lithium ionic cell, the multidimensional negative electrode of lithium ion battery
Piece is the combination electrode of layer structure, including negative current collector, in the graphene amount of negative current collector surface fitting setting
Son point layer, in the graphene quantum dot layer away from the silicon material layer of the surface of negative current collector fitting setting, described
Silicon material layer carries on the back the carbon material layer of the surface fitting setting far from the graphene quantum dot layer, carries on the back in the carbon material layer separate
The ceramic layer of the surface fitting setting of the silicon material layer.
Multidimensional anode plate for lithium ionic cell provided in an embodiment of the present invention is the combination electrode of layer structure, is included in negative
Graphene quantum dot layer, silicon material layer, carbon material layer and the ceramic layer of setting are successively bonded on the collector of pole.With following excellent
Point:
Firstly, the embodiment of the present invention uses graphene quantum dot as priming coat (graphene quantum dot layer), can increase
The corrosion resistance of negative current collector, improves the migration rate of lithium ion, while improving adherency of the silicon materials on negative current collector
Power effectively solves the problems, such as silicium cathode piece poor adhesion.
Secondly, silicon material layer and carbon material layer are arranged in the quantum dot graphene layer and the pottery embodiment of the present invention
Between enamel coating, and the silicon material layer is bonded the quantum dot graphene layer and is arranged, the carbon material layer is bonded ceramic layer
Setting can use the small outside expansion to inhibit silicon materials of volume change of carbon material, reduce the serious volume effect of silicon materials
It answers.
Again, the embodiment of the present invention is that ceramic layer, the ceramic layer is arranged in the position far from negative current collector in outermost layer
Pole piece can not only be improved to the wetability of electrolyte, and the ceramic layer has preferable thermal insulation, it can be in battery charge and discharge
When electric, Fire explosion caused by high-temperature battery short circuit is prevented, the security performance of battery is promoted.
To sum up, multidimensional negative electrode of lithium ion battery provided in an embodiment of the present invention, effectively can inhibit silicon to expand, solve lithium from
Sub- battery silicon, which is alleviated, solves the serious bulk effect of silicon materials, improves the cycle performance of lithium ion battery.
Specifically, graphene quantum dot layer is directly arranged in negative electrode tab collection liquid surface in the embodiment of the present invention, can increase
The corrosion resistance of collector, and due to graphene it is outstanding lead electronic capability and high specific surface area, can adsorb more
Electrolyte can reduce the internal resistance of battery core to further increase the electron conduction and ionic conductivity of lithium ion battery；Together
When active force between foil and negative electrode material is greater than due to the active force between graphene and negative electrode material, so as to be promoted
The adhesion property of silicon material layer.The graphene quantum dot layer be laciniation, the graphene quantum dot layer of laciniation,
Be conducive to enhance the contact area between negative electrode material and graphene to increase, to further increase the electric conductivity of pole piece
In the embodiment of the present invention, the thickness of the graphene quantum dot layer is as thin as possible.Preferably, can be in negative electrode tab
Collection liquid surface is formed on the basis of complete layer structure, and the thickness of the graphene quantum dot layer is less than or equal to 5 nanometers.It is described
The thickness of graphene quantum dot layer is blocked up, on the one hand, lithium ion battery cost can be dramatically increased, simultaneously because the thickness of negative electrode tab
It determines relatively, will affect the thickness of other materials layer, on the other hand, the adhesion strength on negative current collector surface reduces, in work
It is difficult to form preferable film layer in skill, it is often more important that, although blocked up graphene quantum dot layer is able to ascend moving for lithium ion
Rate is moved, but battery multiplying power and cycle performance can be reduced simultaneously.
In the embodiment of the present invention, silicon material layer setting is deviated from into the negative pole currect collecting in the graphene quantum dot layer
The surface of body, adhesion property get a promotion.The silicon materials of silicon material layer described in the embodiment of the present invention select the high (silicon of silicone content
Mass percentage is more than or equal to 60%, to guarantee its embedding lithium capacity) silicon-carbide particle, at least one in silicon carbide fibre
Kind, particularly preferably silicon-carbon fiber.
It is further preferred that the silicon material layer is at three-dimensional net structure.The silicon material layer of three-dimensional net structure, can
Quickly to transmit lithium ion and electronics, it is also possible to the bulking effect of silicon is effectively suppressed after lithium ion is embedded in, from
And improve the cycle performance of lithium ion battery.
Preferably, the silicon material layer with a thickness of 10-20 microns.If the thickness of the silicon material layer is excessively thin, lithium from
The capacity of sub- battery does not reach requirement；If the thickness of the silicon material layer is blocked up, on the one hand, due to silicon materials itself brittleness compared with
Greatly, the reduction of pliability of silicon material layer, meanwhile, the adhesion strength of silicon material layer can be reduced；On the other hand, silicon material layer is blocked up, silicon
Volume expansion is more serious.
The embodiment of the present invention is in the silicon material layer away from the graphene quantum dot layer i.e. far from the negative current collector
Surface be arranged carbon material layer.The carbon material layer is arranged in silicon material layer outer layer, can inhibit the outside expansion of silicon materials, drops
The low serious bulk effect of silicon materials.
Specifically, the material of the carbon material layer may be selected from but not limited to artificial graphite, composite graphite, preferably artificial stone
Ink.Preferably, the carbon material layer is adjusted with a thickness of according to the thickness of the thickness of the negative electrode tab and other materials layer
It is whole, but be preferably controlled within 30 microns, to guarantee that battery has preferable capacity.
Ceramic layer is arranged away from the surface of the silicon material layer in outermost layer, that is, carbon material layer in the embodiment of the present invention, by
Van der Waals force between ceramic layer and electrolyte is better than negative electrode material or basement membrane, and strong active force can increase the leaching of electrolyte
Guarantor's liquid measure that pole piece can be improved in profit speed and porous structure mentions to provide more electrolyte for following cycle process
High circulation performance.Specifically, the material of the ceramic layer is selected from but not limited to Al2O3、TiO2、SiO2、MgO、ZnO、ZrO2In
It is a kind of.It is preferred that SiO2, Al2O3.The ceramic layer with a thickness of 1-8 microns, further preferably 1-3 microns.Due to the ceramics
The ceramic material of layer itself does not provide capacity, and the too thick energy density that can reduce entire battery core of ceramic layer increases moving for lithium ion
Path is moved, the chemical property of lithium ion battery, effect too thin and that rationality is not achieved are influenced.It is further preferred that the pottery
The average grain diameter of ceramic particle is 0.2-1 microns in enamel coating, can not only guarantee that ceramic particle dispersed well but also can guarantee pole
The uniformity of piece entirety and the bending property of pole piece.The average grain diameter control of the ceramic particle in the range, assigns institute
State the preferable flexible of ceramic layer.If the partial size of ceramic particle is larger, uniformity coefficient and the pole of pole piece entirety will affect
The bendability of piece, if ceramic particle is less than normal, dispersion is one and is difficult to solve the problems, such as.
Multidimensional negative electrode of lithium ion battery provided in an embodiment of the present invention, can be prepared by following methods.
Correspondingly, on the other hand the embodiment of the present invention provides a kind of preparation method of multidimensional anode plate for lithium ionic cell, wrap
Include following steps:
S01., negative current collector is provided, graphene quantum dot is deposited on the negative current collector surface, prepares graphene amount
Son point layer；
S02. silicon materials are coated away from the surface of the negative current collector in the graphene quantum dot layer, forms silicon materials
Layer；
S03. the surface depositing carbon material for deviating from the graphene quantum dot layer in the silicon material layer, prepares carbon material
Layer；
S04. the surface deposit ceramic materials for deviating from the silicon material layer in the carbon material layer, prepare ceramic layer.
The preparation method of multidimensional anode plate for lithium ionic cell provided in an embodiment of the present invention, only need on negative current collector according to
Secondary to prepare graphene quantum dot layer, silicon material layer, carbon material layer and ceramic layer, method is relatively simple, it is often more important that, it obtains
The multidimensional negative electrode of lithium ion battery arrived, effectively can inhibit silicon to expand, and it is serious to solve lithium ion battery silicon alleviation solution silicon materials
Bulk effect, improve the cycle performance of lithium ion battery.
Specifically, the negative current collector can be selected from copper foil in above-mentioned steps S01.It is heavy on the negative current collector surface
Product graphene quantum dot, the graphene quantum dot are the graphene quantum dot of Nano grade.Preferably, using pressure atomization
Method prepares graphene quantum dot layer.In this way, graphene quantum dot solution can be made uniformly to be sprayed onto negative current collector
On, and coating thickness keeps uniform, thickness range controls within 5 microns.
Specifically, using the method for pressure atomization prepare graphene quantum dot layer method the following steps are included:
S011. configuration quality percentage composition is the graphene quantum dot solution of 1%-5%；
Wherein, the concentration of graphene quantum dot solution has a certain impact to the processing performance of graphene quantum dot.Specifically
, if the excessive concentration of graphene quantum dot solution, the homogeneity of graphene quantum dot solution is poor, is unfavorable for being formed uniform
Film layer, and the film thickness uniformity formed accordingly reduces.In short, the excessive concentration of graphene quantum dot solution is unfavorable for preparing
Form the graphene quantum dot layer of homogeneity.
S012. pass through spray gun graphene quantum dot solution described in the negative current collector surface pressing atomizing spraying, shape
At graphene quantum dot layer.
It, can be dry together to form fitting after having deposited silicon materials after depositing graphene quantum dot solution in the step
Graphene quantum dot layer and silicon material layer.
In above-mentioned steps S02, the silicon material layer can be prepared by coating method, specifically, can be used coating machine into
Row coating, thickness control when coating are 20-80 micron, and thickness is not to be exceeded 100 microns, it is preferable that the silicon materials after drying
Layer is 10-20 microns.
Preferably, the preparation method of the silicon material layer includes:
After the graphene quantum dot layer surface depositing silicon, hot-pressing processing is carried out, silicon materials is made to be in three dimensional network
Network structure, the silicon material layer that there is three-dimensional net structure through being dried preparation.Silicon material layer with three-dimensional net structure can
Quickly to transmit lithium ion and electronics, meanwhile, but also the expansion of silicon is effectively suppressed after lithium ion insertion.
By post-depositional silicon materials or the silicon materials for depositing the step S02 graphene quantum dot deposited and step S03
Heating, drying is carried out, graphene quantum dot layer and silicon material layer are obtained.
In above-mentioned steps S03, deviate from the surface depositing carbon material of the graphene quantum dot layer in the silicon material layer, it is excellent
Choosing is realized using solution processing method, to obtain the uniform film layer of thickness.
In above-mentioned steps S04, deviates from the surface deposit ceramic materials of the silicon material layer in the carbon material layer, preferably adopt
It is realized with plasma spraying method, to obtain the strong film layer of the good homogeneity of adhesive force.
It is illustrated combined with specific embodiments below.
Embodiment 1
A kind of preparation method of multidimensional anode plate for lithium ionic cell, comprising the following steps:
One layer of graphene is coated on negative electrode of lithium ion battery collector prepares the graphene amount that mass percentage is 1%
Son point solution, using pressure atomization method by spray gun the negative copper foil surface pressing atomizing spraying formed with a thickness of
The laciniation of 2nm；
Disperse the abundant ball milling of silicon materials to form uniform silicon slurry and be added in coating machine charging spout, coating speed 6m/
Min, coating thickness are controlled at 60 μm.Sample prepared by rate-determining steps one at the uniform velocity passes through coating machine, and silicon layer thickness is in 55 μ after drying
M, then 300 DEG C of hot pressing are used, the silicon layer with a thickness of 12 μm is formed, silicon materials form three-dimensional net structure, at 100 DEG C of dryings
It manages spare；
Artificial graphite S360-L1 is prepared into uniform and stable solution, pole piece is immersed in the solution after 12h, at 80 DEG C
The carbon-coating with a thickness of 10 μm is formed after middle baking；
SiO using plasma spraying method, by partial size at 0.8-1.0 μm2About 1 μm of uniform deposition a layer thickness.
Embodiment 2
A kind of preparation method of multidimensional anode plate for lithium ionic cell, comprising the following steps:
One layer of graphene is coated on negative electrode of lithium ion battery collector prepares the graphene that mass percentage is 2.5%
Quantum dot solution, using pressure atomization method by spray gun the negative copper foil surface pressing atomizing spraying formed with a thickness of
The laciniation of 3.5nm；
Disperse the abundant ball milling of silicon materials to form uniform silicon slurry and be added in coating machine charging spout, coating speed 3m/
Min, coating thickness are controlled at 80 μm.Sample prepared by rate-determining steps one at the uniform velocity passes through coating machine, and silicon layer thickness is in 65 μ after drying
M, then 300 DEG C of hot pressing are used, the silicon layer with a thickness of 20 μm is formed, silicon materials form three-dimensional net structure, at 100 DEG C of dryings
It manages spare；
Composite graphite RG-B is prepared into uniform and stable solution, pole piece is immersed in the solution after 12h, dries in 80 DEG C
The carbon-coating with a thickness of 20 μm is formed after roasting；
Al using plasma spraying method, by partial size at 1.0 μm2O3About 3 μm of uniform deposition a layer thickness.
Embodiment 3
A kind of preparation method of multidimensional anode plate for lithium ionic cell, comprising the following steps:
One layer of graphene is coated on negative electrode of lithium ion battery collector prepares the graphene amount that mass percentage is 5%
Son point solution, using pressure atomization method by spray gun the negative copper foil surface pressing atomizing spraying formed with a thickness of
The laciniation of 5nm；
Disperse the abundant ball milling of silicon materials to form uniform silicon slurry and be added in coating machine charging spout, coating speed 2m/
Min, coating thickness are controlled at 75 μm.Sample prepared by rate-determining steps one at the uniform velocity passes through coating machine, and silicon layer thickness is in 55 μ after drying
M, then 300 DEG C of hot pressing are used, the silicon layer with a thickness of 15 μm is formed, silicon materials form three-dimensional net structure, at 100 DEG C of dryings
It manages spare；
Artificial graphite EMG is prepared into uniform and stable solution, pole piece is immersed in the solution after 12h, dries in 80 DEG C
The carbon-coating with a thickness of 20 μm is formed after roasting；
Al using plasma spraying method, by partial size at 0.8-1.0 μm2O3About 3 μm of uniform deposition a layer thickness.
Comparative example 1
A kind of preparation method of ion battery negative electrode tab, comprising the following steps:
Cathode material (silicon-carbon collocation S360-L1) is prepared into the solid uniform sizing material containing about 48-50%, it is uniform by coating machine
Be coated on copper foil on, coating thickness be 50-60 μm, by 60-80 DEG C stage by stage toast after with a thickness of 25 μm or so.
Comparative example 2
A kind of preparation method of ion battery negative electrode tab, comprising the following steps:
Cathode material (silicon-carbon collocation RB-B) is prepared into the solid uniform sizing material containing about 48-50%, it is uniform by coating machine
Coated on copper foil, coating thickness is 100 μm, with a thickness of 45 μm or so after 60-80 DEG C is toasted stage by stage.
Comparative example 3
A kind of preparation method of ion battery negative electrode tab, comprising the following steps:
Cathode material (silicon-carbon collocation EMP) is prepared into the solid uniform sizing material containing about 48-50%, is uniformly applied by coating machine
It is overlying on copper foil, coating thickness is 110 μm, with a thickness of 50 μm or so after 60-80 DEG C is toasted stage by stage.
The conventional anode piece of multidimensional anode plate for lithium ionic cell, comparative example 1-3 preparation prepared by embodiment 1-3 is as lithium
Ion battery negative electrode tab, which is rolled ,-cutting-dries-winding-baking-fluid injection-ageing for 24 hours after carry out chemical property side
The test in face.Wherein just extremely nickelic 811, diaphragm PP/PE/PP, 18 μm, shell is steel shell.
The multidimensional anode plate for lithium ionic cell that embodiment 1-3 and comparative example 1-3 are provided carries out performance comparison, test side
Method are as follows:
(1) pole piece adhesion strength: one section of gummed paper is pasted onto negative electrode tab, and one end of negative electrode tab is clipped in tensile testing machine
In one fixture.Another fixture clamps the free end of gummed paper, and is peeled away gummed paper from steel plate with 180 degree angle.By holding
It is continuous gummed paper is removed into required power from cathode to measure peeling force, be converted to pole piece adhesion strength.
(2) the pole piece imbibition time: the pole piece under identical compacting, it is uniformly equidistant that equivalent electrolyte is added dropwise, observe and record electricity
Solution liquid is fully absorbed the time used by negative electrode tab.
(3) DCR:0.5C constant-current constant-voltage charging is to 4.2V, and 1C discharges 30min to 50%SOC, stands 1h, and 1C discharges 30s,
0.1s takes a little, according to 50%SOC quiescent voltage (U0) and pulsed discharge 0.1s voltage (U0.1s), can calculate battery core
50%SOC DCR value.
(4) battery core internal resistance: the impedance value under 1000HZ is tested using internal resistance test device
(5) high rate performance: 0.5C constant-current constant-voltage charging to 4.2V is discharged to 2.5V with (1C/3C) different multiplying, passes through indigo plant
Electric equipment is it can be concluded that the discharge capacity that different multiplying is discharged.
(6) cycle performance: multiplying power+0.5C/-1.0C, 25 DEG C of room temperature
Test result is as follows shown in table 1:
Table 1
Seen from table 1, compared to the conventional anode piece of comparative example 1-3 preparation, the multidimensional lithium of 1-3 of embodiment of the present invention preparation
Ion battery negative electrode tab has better pole piece adhesion strength, higher imbibition efficiency, lower battery core DCR and battery core internal resistance, together
When, there is better high rate performance and cycle performance.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of multidimensional anode plate for lithium ionic cell, which is characterized in that the multidimensional anode plate for lithium ionic cell is layer structure
Combination electrode, including negative current collector, in the graphene quantum dot layer of negative current collector surface fitting setting, described
Graphene quantum dot layer is carried on the back separate away from the silicon material layer of the surface of negative current collector fitting setting in the silicon material layer
The carbon material layer of the surface fitting setting of the graphene quantum dot layer, is carried on the back in the carbon material layer far from the silicon material layer
The ceramic layer of surface fitting setting.
2. multidimensional anode plate for lithium ionic cell as described in claim 1, which is characterized in that the thickness of the graphene quantum dot layer
Degree is less than or equal to 5 nanometers, and the graphene quantum dot layer is laciniation.
3. multidimensional anode plate for lithium ionic cell as described in claim 1, which is characterized in that the silicon material layer is at three-dimensional network
Structure.
4. multidimensional anode plate for lithium ionic cell as described in any one of claims 1-3, which is characterized in that the silicon material layer
With a thickness of 10-20 microns.
5. multidimensional anode plate for lithium ionic cell as described in any one of claims 1-3, which is characterized in that the silicon material layer
Material is selected from least one of silicon-carbide particle, silicon carbide fibre.
6. multidimensional anode plate for lithium ionic cell as described in any one of claims 1-3, which is characterized in that the thickness of the ceramic layer
Degree is 1-8 microns.
7. multidimensional anode plate for lithium ionic cell as described in any one of claims 1-3, which is characterized in that make pottery in the ceramic layer
The average grain diameter of porcelain particle is 0.2-1 microns.
8. a kind of preparation method of multidimensional anode plate for lithium ionic cell, which comprises the following steps:
Negative current collector is provided, graphene quantum dot is deposited on the negative current collector surface, prepares graphene quantum dot layer；
Silicon materials are coated away from the surface of the negative current collector in the graphene quantum dot layer, form silicon material layer；
Deviate from the surface depositing carbon material of the graphene quantum dot layer in the silicon material layer, prepares carbon material layer；
Deviate from the surface deposit ceramic materials of the silicon material layer in the carbon material layer, prepares ceramic layer.
9. the preparation method of multidimensional anode plate for lithium ionic cell as claimed in claim 8, which is characterized in that use pressure atomization
Method prepare graphene quantum dot layer, specific method the following steps are included:
Configuration quality percentage composition is the graphene quantum dot solution of 1%-5%；
By spray gun graphene quantum dot solution described in the negative current collector surface pressing atomizing spraying, graphene amount is formed
Son point layer.
10. the preparation method of multidimensional anode plate for lithium ionic cell as claimed in claim 8, which is characterized in that the silicon materials
Layer preparation method include:
After the graphene quantum dot layer surface depositing silicon, hot-pressing processing is carried out, silicon materials is made to be in three-dimensional network knot
Structure, the silicon material layer that there is three-dimensional net structure through being dried preparation.
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