CN108023117A - Lithium ion battery of high-energy-density and preparation method thereof - Google Patents
Lithium ion battery of high-energy-density and preparation method thereof Download PDFInfo
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- CN108023117A CN108023117A CN201711249048.6A CN201711249048A CN108023117A CN 108023117 A CN108023117 A CN 108023117A CN 201711249048 A CN201711249048 A CN 201711249048A CN 108023117 A CN108023117 A CN 108023117A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The present invention relates to field of lithium ion battery, specifically, there is provided a kind of lithium ion battery of high-energy-density and preparation method thereof.The outermost negative plate of battery core of the lithium ion battery with high energy density is provided with the negative plate of cathode size for single side, and the side without slurry is outwardly.The outermost negative plate of battery core of above-mentioned lithium ion battery with high energy density is provided with the negative plate of cathode size for single side, and the existing outermost negative plate of battery core is the two-sided negative plate for being provided with cathode size, therefore the quality of battery core is relative to existing battery core quality smaller, and the capacity of battery is constant, energy density is capacity divided by quality, therefore energy density is improved, and cost is lower.
Description
Technical field
The present invention relates to field of lithium ion battery, a kind of lithium ion battery in particular to high-energy-density and its
Preparation method.
Background technology
With the continuous renewal and development of lithium battery technology, the advantages of its light, Gao Rong, long-life, gradually obtains consumer
Favor.Lithium battery market expands to the multiple fields such as camera, DVD, boat film, toy via mobile phone.In recent years, lithium-ion electric
Pond due to have the advantages that voltage is high, recycle often, storage time it is long, not only obtain on a portable electronic device wide
General application, and it is widely used in the large and medium-sized electrical equipment aspect such as electric automobile, electric bicycle and electric tool.
With the popularization of the mobile internet devices such as smart mobile phone and laptop, electric bicycle and battery-operated motor cycle
Deng the popularization of electric vehicle, and the development of the aeronautical and space technology such as unmanned plane and space probe, lithium ion battery
The demand for development of higher can be faced with, and high-energy-density is as one of research direction of high performance lithium ion battery.
In view of this, it is special to propose the present invention.
The content of the invention
The first object of the present invention is to provide a kind of lithium ion battery with high energy density, and the lithium ion battery has energy
The advantages of metric density is high low with cost.
The second object of the present invention is to provide a kind of preparation method of lithium ion battery with high energy density, this method technique
Science is simple, workable, and the lithium ion battery with high energy density being prepared using the above method has energy density more
High, the advantages of cost is lower.
In order to realize the above-mentioned purpose of the present invention, spy uses following technical scheme：
In a first aspect, the present invention provides a kind of lithium ion battery with high energy density, the battery core of the lithium ion battery is most
The negative plate of outer layer is provided with the negative plate of cathode size for single side, and the side without slurry is outwardly.
Second aspect, the present invention provides a kind of preparation method of above-mentioned lithium ion battery with high energy density, including it is following
Step：
(a) respectively by the both sides of anode sizing agent and cathode size coated on plus plate current-collecting body and negative current collector, Ran Houjin
Row is dry and is compacted, and forms two-sided positive plate and two-sided negative plate；
(b) cathode size is coated on to the side of negative current collector, is then dried and is compacted, forms single side anode
Piece；
(c) two-sided positive plate, two-sided negative plate and single side negative plate are cut into required size respectively and are assembled into electricity
Core, wherein single side negative plate are arranged at outermost layer, and the side without slurry is outwardly；
(d) battery core is loaded in housing, electrolyte is then injected into housing, then seal, be finally melted into and partial volume
Up to the lithium ion battery with high energy density.
As further preferred technical solution, in step (a), anode sizing agent is coated on to the both sides of plus plate current-collecting body,
Then it is dry at a temperature of 110-140 DEG C, then rolled using two pairs of rollers, compacted density 2.3-2.8g/cm3, formed it is two-sided just
Pole piece.
As further preferred technical solution, in step (a), cathode size is coated on to the both sides of negative current collector,
Then it is dry at a temperature of 95-110 DEG C, then rolled using two pairs of rollers, compacted density 1.5-2g/cm3, form two-sided anode
Piece.
As further preferred technical solution, in step (b), cathode size is coated on to the side of negative current collector,
Then it is dry at a temperature of 95-110 DEG C, then rolled using two pairs of rollers, compacted density 1.5-2g/cm3, form single side anode
Piece.
As further preferred technical solution, anode sizing agent includes positive electrode, and positive electrode includes cobalt acid lithium, mangaic acid
At least one of lithium, nickel-cobalt-manganese ternary battery material or LiFePO4.
As further preferred technical solution, the positive electrode includes the mixture of LiMn2O4 and LiFePO4.
As further preferred technical solution, the mass ratio of LiMn2O4 and LiFePO4 is 1:1~1:5.
As further preferred technical solution, cathode size includes negative material, and negative material includes native graphite, people
Make at least one of graphite, carbon silicium cathode material, soft carbon or hard carbon.
As further preferred technical solution, the negative material includes the mixture of Delanium and hard carbon.
Compared with prior art, beneficial effects of the present invention are：
The outermost negative plate of battery core of lithium ion battery with high energy density provided by the invention is provided with anode for single side
The negative plate of slurry, and the outermost negative plate of existing battery core is the two-sided negative plate for being provided with cathode size, therefore battery core
Quality relative to existing battery core quality smaller, and the capacity of battery is constant, and energy density is capacity divided by quality, therefore energy
Metric density is improved, and cost is lower.Wherein, the reason for capacity of battery is constant be：Of positive plate in lithium ion battery
Number is less than negative plate, i.e., negative plate is relatively rich, therefore the capacity of battery is mainly determined by the active principle in positive plate,
The content of its active principle does not change, therefore battery capacity is constant.
Two kinds of different negative plates are prepared in the preparation method of lithium ion battery with high energy density provided by the invention, i.e.,
Two-sided negative plate and single side negative plate, craft science is simple, workable, and the high-energy being prepared using the above method is close
Degree lithium ion battery has the advantages that energy density higher, cost are lower.
Embodiment
Embodiment of the present invention is described in detail below in conjunction with embodiment, but those skilled in the art will
Understand, the following example is merely to illustrate the present invention, and is not construed as limiting the scope of the invention.It is not specified in embodiment specific
Condition person, the condition suggested according to normal condition or manufacturer carry out.
In a first aspect, the present invention provides a kind of lithium ion battery with high energy density, the battery core of the lithium ion battery is most
The negative plate of outer layer is provided with the negative plate of cathode size for single side, and the side without slurry is outwardly.
The outermost negative plate of battery core of above-mentioned lithium ion battery with high energy density is provided with the negative of cathode size for single side
Pole piece, and the outermost negative plate of existing battery core is the two-sided negative plate for being provided with cathode size, therefore the quality phase of battery core
For existing battery core quality smaller, and the capacity of battery is constant, and energy density is capacity divided by quality, therefore energy density obtains
To improve, and cost is lower.Wherein, the reason for capacity of battery is constant be：The number of positive plate is less than negative in lithium ion battery
Pole piece, i.e. negative plate are relatively rich, therefore the capacity of battery is mainly determined by the active principle in positive plate, its working substance
The content of matter does not change, therefore battery capacity is constant.
In the present invention, " negative plate for being provided with cathode size " should be interpreted broadly：When battery is stacked, above-mentioned anode
Piece is independently of other negative plates；When battery is takeup type, above-mentioned negative plate is the end of whole negative plate, and the end only single side is set
It is equipped with cathode size.
It should be appreciated that " the outermost negative plate of battery core " refers to be located at the outermost anode of battery core in all negative plates
Piece；" side of no slurry is outwardly " refers to be not provided with the side of cathode size towards the outside of battery core.
Second aspect, the present invention provides a kind of preparation method of above-mentioned lithium ion battery with high energy density, including it is following
Step：
(a) respectively by the both sides of anode sizing agent and cathode size coated on plus plate current-collecting body and negative current collector, Ran Houjin
Row is dry and is compacted, and forms two-sided positive plate and two-sided negative plate；
(b) cathode size is coated on to the side of negative current collector, is then dried and is compacted, forms single side anode
Piece；
(c) two-sided positive plate, two-sided negative plate and single side negative plate are cut into required size respectively and are assembled into electricity
Core, wherein single side negative plate are arranged at outermost layer, and the side without slurry is outwardly；
(d) battery core is loaded in housing, electrolyte is then injected into housing, then seal, be finally melted into and partial volume
Up to the lithium ion battery with high energy density.
Two kinds of different negative plates, i.e., two-sided anode are prepared in the preparation method of above-mentioned lithium ion battery with high energy density
Piece and single side negative plate, craft science is simple, workable, the high energy density lithium ion being prepared using the above method
Battery has the advantages that energy density higher, cost are lower.
The above method be prepared for stack type lithium ion battery, relative to coiled lithium ion battery, there is internal resistance
Low, high-multiplying power discharge capacity is high, discharge platform is high, capacity density is high, energy density is high, thickness controllability is high, be unlikely to deform and
The advantages of size is flexible, application range are more extensive.
The drying temperature of electrode slice has certain influence for electrode slice, and drying temperature is too low to be increased drying time, extend
Production cycle, drying temperature is excessive, easily cracks, and influences properties of product；Compacted density has battery performance larger shadow
To ring, compacted density has substantial connection with electrode slice specific capacity, efficiency, internal resistance and cycle performance of battery, within the specific limits, pressure
Real density is bigger, and the capacity of battery is higher, but when compacted density is excessive or too small, can be unfavorable for the insertion of lithium ion and de-
Go out.
Considered based on above-mentioned, in a preferred embodiment, in step (a), anode sizing agent is coated on cathode collection
The both sides of fluid, it is then dry at a temperature of 110-140 DEG C, then rolled using two pairs of rollers, compacted density 2.3-2.8g/cm3,
Form two-sided positive plate.It is 110 DEG C that temperature when above-mentioned dry is typical but non-limiting, 115 DEG C, 120 DEG C, 125 DEG C, 130
DEG C, 135 DEG C or 140 DEG C；Typical but non-limiting above-mentioned compacted density is 2.3g/cm3、2.4g/cm3、2.5g/cm3、2.6g/
cm3、2.7g/cm3Or 2.8g/cm3。
Considered based on above-mentioned, in a preferred embodiment, in step (a), cathode size is coated on anode collection
The both sides of fluid, it is then dry at a temperature of 95-110 DEG C, then rolled using two pairs of rollers, compacted density 1.5-2g/cm3, shape
Into two-sided negative plate.It is 95 DEG C that temperature when above-mentioned dry is typical but non-limiting, 96 DEG C, 98 DEG C, 100 DEG C, 102 DEG C, 104
DEG C, 106 DEG C, 108 DEG C or 110 DEG C；Typical but non-limiting above-mentioned compacted density is 1.5g/cm3、1.6g/cm3、1.7g/
cm3、1.8g/cm3、1.9g/cm3Or 2g/cm3。
Considered based on above-mentioned, in a preferred embodiment, in step (b), cathode size is coated on anode collection
The side of fluid, it is then dry at a temperature of 95-110 DEG C, then rolled using two pairs of rollers, compacted density 1.5-2g/cm3, shape
Into single side negative plate.It is 95 DEG C that temperature when above-mentioned dry is typical but non-limiting, 96 DEG C, 98 DEG C, 100 DEG C, 102 DEG C, 104
DEG C, 106 DEG C, 108 DEG C or 110 DEG C；Typical but non-limiting above-mentioned compacted density is 1.5g/cm3、1.6g/cm3、1.7g/
cm3、1.8g/cm3、1.9g/cm3Or 2g/cm3。
In a preferred embodiment, anode sizing agent includes positive electrode, and positive electrode includes cobalt acid lithium, mangaic acid
At least one of lithium, nickel-cobalt-manganese ternary battery material or LiFePO4.Cobalt acid lithium appearance is in dark gray powder, chemical property
Superior, first discharge specific capacity is more than 135mAh/g, and tap density is big, helps to improve battery volume and capacity ratio, properties of product
Stabilization, uniformity are good；LiMn2O4 has the advantages that price is low, current potential is high, environmental-friendly, security performance is high；Nickel-cobalt-manganese ternary electricity
Pond lower cost for material, gram volume height (>150mAh/g), operating voltage and existing electrolyte matching are good (4.1V), security
It is good；The theoretical specific capacity of LiFePO4 is up to 170mAh/g, is current safest anode material for lithium-ion batteries, without any
Harmful heavy metal element, long lifespan, can be more than 2000 times with discharge and recharge under the conditions of 100%DOD.
It is cobalt acid lithium that positive electrode in the present invention is typical but non-limiting, LiMn2O4, nickel-cobalt-manganese ternary battery material,
The mixture of the mixture of LiFePO4, cobalt acid lithium and LiMn2O4, LiMn2O4 and LiFePO4, nickel-cobalt-manganese ternary battery material and
The mixture of LiFePO4, the mixture of cobalt acid lithium, LiMn2O4 and nickel-cobalt-manganese ternary battery material, LiMn2O4, nickel-cobalt-manganese ternary
Mixture of battery material and LiFePO4 etc..
In a preferred embodiment, the positive electrode includes the mixture of LiMn2O4 and LiFePO4.With manganese
The mixture of sour lithium and LiFePO4 is not only able to make battery price more moderate as positive electrode, and high/low temperature is followed
Ring performance is more preferable.
In a preferred embodiment, the mass ratio of LiMn2O4 and LiFePO4 is 1:1~1:5.Above-mentioned mass ratio
Typical but non-limiting is 1:1、1:2、1:3、1:4 or 1:5.The LiMn2O4 of above-mentioned mass ratio and the mixture of LiFePO4 are
Positive electrode can make the properties of battery more excellent.
In a preferred embodiment, cathode size includes negative material, and negative material includes native graphite, artificial
At least one of graphite, carbon silicium cathode material, soft carbon or hard carbon.Natural graphite negative electrode material is to use natural flakey crystalloid
Graphite handles to obtain through processes such as crushing, nodularization, classification, passivation, surfaces, what its high-crystallinity was naturally occurring；Delanium
Negative material is to calcine easy graphited carbon (such as petroleum coke, needle coke, pitch coke) at a certain temperature, then through crushing,
Classification, high temperature graphitization are made, its high-crystallinity is formed by high temperature graphitization；Carbon silicium cathode material, that is, carbon silicon Compound Negative
Pole material, its structure mainly have cladded type, embedded type and doping type, and nano level silicon-carbon cathode material has high lithium storage content
(its room temperature theoretical capacity is up to 3580mAh/g), far super graphite (372mAh/g), have good electron channel, it is less should
Become and promote SEI films to stablize the environment of growth；Soft carbon, that is, easy graphitized carbon, referring to can stone under the hot conditions more than 2000 DEG C
The amorphous carbon of inkization, crystallinity is low, crystallite dimension is small, interplanar distance is larger and the compatibility of electrolyte is good, first charge-discharge
Irreversible capacity it is higher, output voltage is relatively low, and without obvious charge and discharge platform current potential, common soft carbon has petroleum coke and needle-shaped
Jiao etc.；Hard carbon is also known as difficult graphitized carbon, is the pyrolytic carbon of high molecular polymer, and this kind of carbon is also difficult to stone in 3000 DEG C of high temperature
Mo Hua, hard carbon have resin carbon, organic polymer pyrolytic carbon, carbon black etc., and wherein poly furfuryl alcohol resin carbon is used as ion cathode material lithium,
For specific capacity up to 400mAh/g, its interplanar distance is appropriate, is conducive to the insertion of lithium without causing structure significantly to expand, and has very
Good charge-discharge performance.
It is native graphite that negative material in the present invention is typical but non-limiting, Delanium, and carbon silicium cathode material is soft
The mixture of the mixture of carbon, hard carbon, native graphite and Delanium, Delanium and hard carbon, carbon silicium cathode material and soft carbon
Mixture, the mixture of soft carbon and hard carbon, the mixture of native graphite, Delanium and carbon silicium cathode material, carbon silicium cathode
Mixture of material, soft carbon and hard carbon etc..
In a preferred embodiment, the negative material includes the mixture of Delanium and hard carbon.Further
Preferably, the mass ratio of Delanium and hard carbon is 4:1~1:2.Typical but non-limiting above-mentioned mass ratio is 4:1、3:1、
2:1、1:1 or 1:2.The Delanium of above-mentioned mass ratio and the mixture of hard carbon can make the properties of battery for negative material
It is more excellent.
It should be appreciated that unmentioned preparation process and parameter in the present invention, such as positive electrode or the grain of negative material
Conductive agent, the selection of binding agent and solvent and addition etc. are according to the routine of this area in footpath, anode sizing agent or cathode size
Selection, the present invention is to this and is not particularly limited.
With reference to embodiment and comparative example, the present invention will be further described in detail.
Embodiment 1
A kind of lithium ion battery with high energy density, the outermost negative plate of battery core of the lithium ion battery are set for single side
There is the negative plate of cathode size, and the side without slurry is outwardly；
The preparation method of above-mentioned lithium ion battery with high energy density comprises the following steps：
(a) respectively by the both sides of anode sizing agent and cathode size coated on plus plate current-collecting body and negative current collector, Ran Houjin
Row is dry and is compacted, and forms two-sided positive plate and two-sided negative plate；The drying temperature of two-sided positive plate is 105 DEG C, compacted density
For 3.0g/cm3；The drying temperature of two-sided negative plate is 115 DEG C, compacted density 2.5g/cm3；
(b) cathode size is coated on to the side of negative current collector, is then dried and is compacted, forms single side anode
Piece；The drying temperature of single side negative plate is 115 DEG C, compacted density 2.5g/cm3；
Positive electrode is cobalt acid lithium；Negative material is native graphite；
(c) two-sided positive plate, two-sided negative plate and single side negative plate are cut into required size respectively and are assembled into electricity
Core, wherein single side negative plate are arranged at outermost layer, and the side without slurry is outwardly；
(d) battery core is loaded in housing, electrolyte is then injected into housing, then seal, be finally melted into and partial volume
Up to the lithium ion battery with high energy density.
Detected through lithium battery grading system, the capacity of the lithium ion battery in embodiment 1 is 30.51Ah, and energy density is
190.35Wh/kg, 1C cycle-index are 2267 times.
Embodiment 2
A kind of lithium ion battery with high energy density, as different from Example 1, the drying temperature of two-sided positive plate is 120
DEG C, compacted density 2.5g/cm3；The drying temperature of two-sided negative plate is 100 DEG C, compacted density 1.8g/cm3；Single side anode
The drying temperature of piece is 100 DEG C, compacted density 1.8g/cm3；Remaining each step and parameter are same as Example 1.
Detected through lithium battery grading system, the capacity of the lithium ion battery in embodiment 2 is 31.48Ah, and energy density is
189.92Wh/kg, 1C cycle-index are 2146 times.
Embodiment 3
A kind of lithium ion battery with high energy density, as different from Example 1, the drying temperature of two-sided positive plate is 110
DEG C, compacted density 2.3g/cm3；The drying temperature of two-sided negative plate is 95 DEG C, compacted density 1.5g/cm3；Single side negative plate
Drying temperature be 95 DEG C, compacted density 1.5g/cm3；Remaining each step and parameter are same as Example 1.
Detected through lithium battery grading system, the capacity of the lithium ion battery in embodiment 3 is 32.44Ah, and energy density is
191.28Wh/kg, 1C cycle-index are 2071 times.
Embodiment 4
A kind of lithium ion battery with high energy density, as different from Example 1, the drying temperature of two-sided positive plate is 140
DEG C, compacted density 2.8g/cm3；The drying temperature of two-sided negative plate is 110 DEG C, compacted density 2g/cm3；Single side negative plate
Drying temperature be 110 DEG C, compacted density 2g/cm3；Remaining each step and parameter are same as Example 1.
Detected through lithium battery grading system, the capacity of the lithium ion battery in embodiment 4 is 31.85Ah, and energy density is
190.39Wh/kg, 1C cycle-index are 2154 times.
Embodiment 5
A kind of lithium ion battery with high energy density, as different from Example 1, positive electrode are LiMn2O4 and LiFePO4
Mixture, the mass ratio of LiMn2O4 and LiFePO4 is 1:3；Remaining each step and parameter are same as Example 1.
Detected through lithium battery grading system, the capacity of the lithium ion battery in embodiment 5 is 30.48Ah, and energy density is
191.72Wh/kg, 1C cycle-index are 2089 times.
Embodiment 6
A kind of lithium ion battery with high energy density, as different from Example 1, negative material are Delanium and hard carbon
The mass ratio of mixture, Delanium and hard carbon is 2:1；Remaining each step and parameter are same as Example 1.
Detected through lithium battery grading system, the capacity of the lithium ion battery in embodiment 6 is 31.34Ah, and energy density is
192.19Wh/kg, 1C cycle-index are 2248 times.
Embodiment 7
Kind lithium ion battery with high energy density, as different from Example 1, positive electrode are LiMn2O4 and LiFePO4
The mass ratio of mixture, LiMn2O4 and LiFePO4 is 1:3；Negative material is the mixture of Delanium and hard carbon, artificial stone
The mass ratio of ink and hard carbon is 2:1；Remaining each step and parameter are same as Example 1.
Detected through lithium battery grading system, the capacity of the lithium ion battery in embodiment 7 is 32.98Ah, and energy density is
191.56Wh/kg, 1C cycle-index are 2469 times.
Comparative example 1
A kind of lithium ion battery, its preparation method comprise the following steps：
(a) respectively by the both sides of anode sizing agent and cathode size coated on plus plate current-collecting body and negative current collector, Ran Houjin
Row is dry and is compacted, and forms two-sided positive plate and two-sided negative plate；The drying temperature of two-sided positive plate is 105 DEG C, compacted density
For 3.0g/cm3；The drying temperature of two-sided negative plate is 115 DEG C, compacted density 2.5g/cm3；
Positive electrode is cobalt acid lithium；Negative material is native graphite；
(c) two-sided positive plate and two-sided negative plate are cut into required size respectively and are assembled into battery core, wherein single side
Negative plate is arranged at outermost layer, and the side without slurry is outwardly；
(d) battery core is loaded in housing, electrolyte is then injected into housing, then seal, be finally melted into and partial volume
Up to the lithium ion battery with high energy density.
Detected through lithium battery grading system, the capacity of the lithium ion battery in comparative example 1 is 31.69Ah, and energy density is
170.43Wh/kg, 1C cycle-index are 2058 times.
Although being illustrated and the invention has been described with specific embodiment, but will be appreciated that without departing substantially from the present invention's
Many other change and modification can be made in the case of spirit and scope.It is, therefore, intended that in the following claims
Including belonging to all such changes and modifications in the scope of the invention.
Claims (10)
- A kind of 1. lithium ion battery with high energy density, it is characterised in that the outermost negative plate of battery core of the lithium ion battery The negative plate of cathode size is provided with for single side, and the side without slurry is outwardly.
- 2. the preparation method of the lithium ion battery with high energy density described in claim 1, it is characterised in that comprise the following steps：(a) respectively then the both sides of anode sizing agent and cathode size coated on plus plate current-collecting body and negative current collector are done Dry and compacting, forms two-sided positive plate and two-sided negative plate；(b) cathode size is coated on to the side of negative current collector, is then dried and is compacted, forms single side negative plate；(c) two-sided positive plate, two-sided negative plate and single side negative plate are cut into required size respectively and are assembled into battery core, its Middle single side negative plate is arranged at outermost layer, and the side without slurry is outwardly；(d) battery core is loaded in housing, electrolyte is then injected into housing, then sealed, finally carry out chemical conversion and partial volume to obtain the final product The lithium ion battery with high energy density.
- 3. the preparation method of lithium ion battery with high energy density according to claim 2, it is characterised in that in step (a), Anode sizing agent is coated on to the both sides of plus plate current-collecting body, it is then dry at a temperature of 110-140 DEG C, then rolled using two pairs of rollers, Compacted density is 2.3-2.8g/cm3, form two-sided positive plate.
- 4. the preparation method of lithium ion battery with high energy density according to claim 2, it is characterised in that in step (a), Cathode size is coated on to the both sides of negative current collector, it is then dry at a temperature of 95-110 DEG C, then rolled using two pairs of rollers, press Real density is 1.5-2g/cm3, form two-sided negative plate.
- 5. the preparation method of lithium ion battery with high energy density according to claim 2, it is characterised in that in step (b), Cathode size is coated on to the side of negative current collector, it is then dry at a temperature of 95-110 DEG C, then rolled using two pairs of rollers, press Real density is 1.5-2g/cm3, form single side negative plate.
- 6. according to the preparation method of claim 2-5 any one of them lithium ion battery with high energy densities, it is characterised in that just Pole slurry includes positive electrode, and positive electrode is included in cobalt acid lithium, LiMn2O4, nickel-cobalt-manganese ternary battery material or LiFePO4 It is at least one.
- 7. the preparation method of lithium ion battery with high energy density according to claim 6, it is characterised in that the cathode material Material includes the mixture of LiMn2O4 and LiFePO4.
- 8. the preparation method of lithium ion battery with high energy density according to claim 7, it is characterised in that LiMn2O4 and phosphorus The mass ratio of sour iron lithium is 1:1~1:5.
- 9. according to the preparation method of claim 2-5 any one of them lithium ion battery with high energy densities, it is characterised in that negative Pole slurry includes negative material, and negative material is included in native graphite, Delanium, carbon silicium cathode material, soft carbon or hard carbon It is at least one.
- 10. the preparation method of lithium ion battery with high energy density according to claim 9, it is characterised in that the anode Material includes the mixture of Delanium and hard carbon.
Priority Applications (1)
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| US11522222B2 (en) | 2018-09-21 | 2022-12-06 | Ningde Amperex Technology Limited | Electrolyte and electrochemical device |
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| CN112615062A (en) * | 2020-12-19 | 2021-04-06 | 山东聚信新能源科技有限公司 | High-energy-density laminated lithium ion battery pole group, manufacturing method thereof and battery |
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