CN109503166A - A kind of flatbed lithium ion battery graphite cathode material and preparation method - Google Patents
A kind of flatbed lithium ion battery graphite cathode material and preparation method Download PDFInfo
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- CN109503166A CN109503166A CN201811149763.7A CN201811149763A CN109503166A CN 109503166 A CN109503166 A CN 109503166A CN 201811149763 A CN201811149763 A CN 201811149763A CN 109503166 A CN109503166 A CN 109503166A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 83
- 239000010439 graphite Substances 0.000 title claims abstract description 83
- 239000010406 cathode material Substances 0.000 title claims abstract description 34
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 107
- 239000000463 material Substances 0.000 claims abstract description 45
- 239000002006 petroleum coke Substances 0.000 claims abstract description 44
- 239000000853 adhesive Substances 0.000 claims abstract description 24
- 230000001070 adhesive effect Effects 0.000 claims abstract description 24
- 239000007787 solid Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 16
- 238000012986 modification Methods 0.000 claims abstract description 9
- 230000004048 modification Effects 0.000 claims abstract description 9
- 238000000465 moulding Methods 0.000 claims abstract description 9
- 238000005119 centrifugation Methods 0.000 claims abstract description 5
- 239000007773 negative electrode material Substances 0.000 claims abstract description 4
- 239000007767 bonding agent Substances 0.000 claims description 17
- 230000004044 response Effects 0.000 claims description 11
- 229920002521 macromolecule Polymers 0.000 claims description 7
- 238000012216 screening Methods 0.000 claims description 7
- 229920000642 polymer Polymers 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 5
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000005034 decoration Methods 0.000 claims description 3
- 239000011322 oil system pitch Substances 0.000 claims description 3
- 239000005011 phenolic resin Substances 0.000 claims description 3
- 229920001568 phenolic resin Polymers 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims description 2
- 230000008439 repair process Effects 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052744 lithium Inorganic materials 0.000 abstract description 5
- 230000006378 damage Effects 0.000 abstract description 4
- 210000001787 dendrite Anatomy 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- 238000003032 molecular docking Methods 0.000 description 3
- 238000007086 side reaction Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002789 polymer coal Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000011271 tar pitch Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/522—Graphite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/528—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components
- C04B35/532—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components containing a carbonisable binder
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a kind of flatbed lithium ion battery graphite cathode material and its preparation methods, be by after petroleum coke particles surface modification class solid petroleum coke particles and forming adhesive homogenized, be heat-treated centrifugal mixer simultaneously and be extruded from type, wherein heat treatment and whipping process form centrifugation extruding force to mixed material, so that the big plane of class solid structure petroleum coke particles is mutually butted molding to get the graphite particle negative electrode material of microcosmic flatbed structure.Graphite cathode material of the invention has the characteristics that platform model, structural stability and intensity are preferable, strengthen the bulk density of graphite, reduce the secondary destruction of particle structure in process, cycle life of the graphite particle material in lithium battery applications system can be extended, reduce surface negative reaction and reaction process produces gas, Li dendrite etc., greatly improves the security performance of material.
Description
Technical field
The present invention relates to technical field of lithium ion, in particular to a kind of flatbed lithium ion battery graphite cathode material
Material and its preparation method.
Background technique
Lithium electric energy industry is quickly grown in recent years, and lithium electricity related industry is also synchronous to be rapidly developed, and the world prohibits fuel oil at present
Automobile cry is increasingly surging, and fuel vehicle injunction is brought into schedule by the multiple countries in the whole world, for this purpose, graphite cathode material is caused to need
The amount of asking is also increasing.One of important link in graphite cathode material precursor preparation technique is exactly graphite microscopic particulate structure
Molding, this concerning arrive graphite cathode material comprehensive performance, meanwhile, graphite microstructure modelling reasonability, concerning arrive graphite
Reasonability of the material in the applicable cases in the fields such as power.In negative electrode material precursor construction forming process, graphite cathode material
The exploitation of material has to be designed with power vehicle lithium battery using key factor for guiding, from angle is applied, charges
Time, cycle life, security performance are important consideration index.
However, the microstructure molding mode that graphite cathode material practical commercial uses at present is relatively single, to microcosmic
The artificial control ability of structure finished product is not strong, and there are carried out more after randomness or shaping structures by later period reprocessing for majority
Decorations are studied for a second time courses one has flunked, consume excess resource, and later period structural modification is often with the introducing of many side reaction factors, such as graphite particle
Surface-active point, functional group's denaturation introduce new uncertain factor to the security performance of material, lead to the application and peace of material
Full performance cannot ensure.
In view of this, how to screen and prepare former, the graphite with class geometry microstructure it is necessory to study
Grain；How suitable graphite particle bonding agent is screened to ensure with mobility required for flatbed shaping structures；How to lead to
The thermal reaction characteristic formulation heat treatment mode for crossing bonding agent and graphite original particle itself come into full contact with the two can, form platform
Type structure；How suitable molding equipment is formulated by the thermal reaction characteristic of bonding agent and graphite original particle itself to form it into
Have the flatbed structure graphite particle compared with strong structure intensity, and then overcomes the shortcoming of existing graphite cathode material.
Summary of the invention
It is an object of the present invention to be directed to the above-mentioned deficiency of the prior art, a kind of flatbed lithium ion battery stone is provided
Black negative electrode material and its preparation method, graphite microscopic particles have the characteristics that platform model, structural stability and intensity are preferable, reinforce
The bulk density of graphite reduces the secondary destruction of particle structure in process, can extend the cycle life of particle, subtract
Lack surface negative reaction and reaction process produces gas, Li dendrite etc., greatly improves the security performance of material.
The technical scheme adopted by the invention to achieve the purpose is as follows:
A kind of flatbed lithium ion battery graphite cathode material, the flatbed lithium ion battery are with graphite cathode material
It homogenized by class solid petroleum coke particles after surface modification with bonding agent, be heat-treated centrifugal mixer simultaneously and be extruded from
Type.This flatbed structural model graphite cathode material structure, further strengthens graphite particle stability and molding structure
Intensity, while overcoming the countersabotage of graphite cathode material structure in process, and then the security performance of reinforcement material, it keeps away
Exempt from graphite particle and side reaction occurs in the lithium battery mould group course of work.
Preferably, the surface modification includes carrying out corner angle, grinding and screening to acicular petroleum coke particle；It repairs on surface
Decorations can reduce individual particles surface defect, avoid grain forming in the process since individual particles surface defect causes flatbed
Grain generates defect and influences shaped granule structural strength.The flatbed lithium ion battery has platform mould with graphite cathode material
Type, structural stability and intensity are preferably graphitized particle.
Preferably, the median particle diameter DV50 of the acicular petroleum coke particle is 5-30 μm.
Preferably, the mass percent of the petroleum coke particles and forming adhesive is petroleum coke particles 1-30%, glues
Meet agent 70-99%.
Preferably, the median particle diameter DV50 of the forming adhesive is 1-20 μm.Preferably, the forming adhesive
For macromolecule high polymer bonding agent, macromolecule high polymer bonding agent is one or more in coal, oil system pitch or phenolic resin
A kind of preparation method of flatbed lithium ion battery graphite cathode material above-mentioned, including the following steps:
S1: modifying acicular petroleum coke particle surface, including goes corner angle, grinding and screening sub-material, is modified
Class solid structure petroleum coke particles afterwards；
S2: class solid structure petroleum coke particles being mixed with forming adhesive and are homogenized to obtain mixed material, it
Mixed material is heat-treated afterwards, while high-speed stirred is carried out to mixed material in fixed thermal response container, to mixture
Material forms centrifugation extruding force, and forming adhesive makes the big plane phase of class solid structure petroleum coke particles under the effect of strong centrifugal force
The mutually graphite particle that docking forms to get microcosmic flatbed structure.
Preferred forming adhesive has good heat characteristic, after raw material homogenizes, by combining bonding agent and graphite
Heat characteristic of grain itself sets reasonable heat treatment process, and material moves in fixed thermal response container in heat treatment process, together
When by the control of stirring structure and temperature and stirring linear velocity, different degrees of centrifugation is generated to material in temperature-rise period and is squeezed
Pressure.Geometry independence graphite particle is in forming process, due to receiving under stronger external force, two particle surface faces
The lesser plane of product is switched to particle and the larger plane of particle surface and puts down with larger because the effect of external force can not stablize docking
Face forms docking, and big plane is mutually butted molding.Since bond area is larger, intensity also accordingly reaches between such individual particles
It maximizes, strong guarantee is provided for microcosmic flatbed structural generation and generation structural strength, simultaneously because in high linear speed
The offspring formed under the conditions of degree, shaped granule surface are formed since bonding unstable structure graphite particle will substantially reduce
Afterwards, cooperate appropriate linear velocity (3-20m/s), while with the rising of temperature, bonding agent bonding force is strengthened, further stablize
Graphite particle structure can mention significantly to obtain preferably being graphitized particle with platform model, structural stability and intensity
The safety and processing of liter graphite and application performance.
Preferably, the heat treatment process is the temperature programming under protective atmosphere, 10~15 DEG C/min of heating rate, heat
Temperature ranges are 25-900 DEG C.
Preferably, the volume accounting of the internal volume of the fixation thermal response container and mixed material is 3-5:1.
Preferably, the high-speed stirred is 600~1200r/min.
Compared with prior art, the invention has the following beneficial effects:
1. flatbed lithium ion battery graphite cathode material of the invention and its preparation method, by acicular petroleum coke particle
Class solid petroleum coke particles after surface modification and bonding agent, which homogenized, is heat-treated centrifugal mixer simultaneously is extruded from type
, there is platform model, structural stability and intensity to be preferably graphitized particle.
2. the present invention is innovatively by graphite particle microstructure hardware and software platform, compared to the graphite particle applied at present,
The bulk density of graphite can be further strengthened, graphite can be promoted and apply the energy purpose designed and graphite stone in process
Ink makeup furnace volume, reduces processing cost.
3. flatbed structure graphite grain structure intensity of the invention and stability are more preferable, it can effectively reduce particle and adding
The secondary destruction of structure, can extend the cycle life of particle during work.
4. flatbed structure graphite particle packing of the invention is reasonable, the destruction journey of the roll-in particle after film can be reduced
Degree reduces and generates new end face due to destroying, and then improves the cycle life of material, reduces surface negative reaction, reduces reaction
Process produces situations such as gas, Li dendrite, greatly promotes the security performance of material.
Above-mentioned is the general introduction of inventive technique scheme, below in conjunction with attached drawing and specific embodiment, is done further to the present invention
Explanation.
Detailed description of the invention
Fig. 1 is the electron microscopic picture of the flatbed lithium ion battery graphite cathode material of the present embodiment 1；
Fig. 2 is another electron microscopic picture of the flatbed lithium ion battery graphite cathode material of the present embodiment 1；
Fig. 3 is microstructure schematic diagram after the ordinary graphite particle film of the prior art；
Fig. 4 is microstructure schematic diagram after the ordinary graphite particle film roll-in of the prior art；
Fig. 5 is the petroleum coke particles microstructure schematic diagram of the absolute construction after modifying in the present embodiment；
Fig. 6 is flatbed molded graphite particle microstructure schematic diagram in the present embodiment；
Fig. 7 is microstructure schematic diagram after flatbed molded graphite particle roll-in in the present embodiment.
Specific embodiment:
In order to which the purpose of the present invention and technical solution and advantage is more clearly understood, make below in conjunction with drawings and examples
It is described in detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to limit this hair
It is bright.
Black portions are represented as graphite particle in attached drawing 3-7, and microstructure is shown after the ordinary graphite particle film in Fig. 3
Internal voids are more between intention can be seen that molded graphite particle, influence graphite bulk density.Ordinary graphite particle in Fig. 4 applies
Particle is destroyed after microstructure schematic diagram can be seen that pole piece roll-in after deflector roll pressure, and it is stronger to generate side reaction for particle displacement
The new end face of activity.It can be seen that the independent graphite particle screened after modification has class solid structure in Fig. 5.It can be seen in Fig. 6
Flatbed molded graphite particle internal voids defect is small out, and bulk density is big.It can be seen that flatbed molded graphite particle in Fig. 7
Bond area is big, and stability is good, and structural strength is big, is not easy to be destroyed.
Embodiment 1: the preparation method and its graphite of a kind of flatbed lithium ion battery graphite cathode material of the present embodiment are negative
Pole material, including the following steps: firstly, modifying acicular petroleum coke particle surface, including go corner angle, grinding and screening
Sub-material, the class solid structure petroleum coke particles after being modified；Wherein, the median particle diameter DV50 of acicular petroleum coke particle is 5-
30μm.Class solid structure can be class rectangular parallelepiped structure or class cube structure etc..
Then class solid structure petroleum coke particles are mixed with forming adhesive and are homogenized to obtain mixed material,
The median particle diameter DV50 of middle forming adhesive is 1-20 μm.Forming adhesive is macromolecule high polymer bonding agent oil system pitch；Stone
The mass percent of oil coke particle and forming adhesive is petroleum coke particles 30%, bonding agent 70%.
Mixed material is heat-treated later, heat treatment process is the temperature programming under protective atmosphere, heating rate 10
DEG C/min, heat-treatment temperature range is 900 DEG C.High-speed stirred is carried out to mixed material in fixed thermal response container simultaneously,
The internal volume of middle fixed thermal response container and the volume accounting of mixed material are 3:1, and high-speed stirred rate is 1000r/min.
By controlling the linear velocity of temperature and whipping process, centrifugation extruding force is formed to mixed material, forming adhesive is in strong centrifugal force
The big plane of class solid structure petroleum coke particles is set to be mutually butted molding to get the graphite of microcosmic flatbed structure under effect
Grain, to be preferably graphitized particle with platform model, structural stability and intensity.
Embodiment 2: the preparation method and its graphite of a kind of flatbed lithium ion battery graphite cathode material of the present embodiment are negative
Pole material, including the following steps: firstly, modifying acicular petroleum coke particle surface, including go corner angle, grinding and screening
Sub-material, the class solid structure petroleum coke particles after being modified；Wherein, the median particle diameter DV50 of acicular petroleum coke particle is 5-
30μm。
Then class solid structure petroleum coke particles are mixed with forming adhesive and are homogenized to obtain mixed material,
The median particle diameter DV50 of middle forming adhesive is 1-20 μm.Forming adhesive is macromolecule high polymer coal tar pitch；Petroleum coke particles
Mass percent with forming adhesive is petroleum coke particles 20%, bonding agent 80%.
Mixed material is heat-treated later, heat treatment process is the temperature programming under protective atmosphere, heating rate 12
DEG C/min, heat-treatment temperature range is 500 DEG C.High-speed stirred is carried out to mixed material in fixed thermal response container simultaneously,
The internal volume of middle fixed thermal response container and the volume accounting of mixed material are 5:1, and high-speed stirred rate is 600r/min, i.e.,
The graphite particle of microcosmic flatbed structure is obtained, to be preferably graphitized particle with platform model, structural stability and intensity.
Embodiment 3: the preparation method and its graphite of a kind of flatbed lithium ion battery graphite cathode material of the present embodiment are negative
Pole material, including the following steps: firstly, modifying acicular petroleum coke particle surface, including go corner angle, grinding and screening
Sub-material, the class solid structure petroleum coke particles after being modified；Wherein, the median particle diameter DV50 of acicular petroleum coke particle is 5-
30μm。
Then class solid structure petroleum coke particles are mixed with forming adhesive and are homogenized to obtain mixed material,
The median particle diameter DV50 of middle forming adhesive is 1-20 μm.Forming adhesive is one in macromolecule high polymer bonding agent phenolic resin
Kind is a variety of；The mass percent of petroleum coke particles and forming adhesive is petroleum coke particles 10%, bonding agent 90%.
Mixed material is heat-treated later, heat treatment process is the temperature programming under protective atmosphere, heating rate 13
DEG C/min, heat-treatment temperature range is 800 DEG C.High-speed stirred is carried out to mixed material in fixed thermal response container simultaneously,
The internal volume of middle fixed thermal response container and the volume accounting of mixed material are 4:1, and high-speed stirred rate is 900r/min.I.e.
The graphite particle of microcosmic flatbed structure is obtained, to be preferably graphitized particle with platform model, structural stability and intensity.
According to the disclosure and teachings of the above specification, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and is modified.Therefore, above description is not the limitation to invention, and the invention is not limited to be disclosed above and describe
Specific embodiment, to some modifications and changes such as those skilled in the art of invention embodiment essence
Variation, remodeling, the addition that the equivalence replacement of each raw material and addition, selection of concrete mode of auxiliary element etc. are made in range
Or the modifications such as replacement, it should also fall into the scope of the claims of the present invention.
Claims (10)
1. a kind of flatbed lithium ion battery graphite cathode material, which is characterized in that the flatbed lithium ion battery graphite
Negative electrode material be by after petroleum coke particles surface modification class solid petroleum coke particles and forming adhesive homogenized,
It is heat-treated centrifugal mixer extrusion forming simultaneously and obtains.
2. flatbed lithium ion battery graphite cathode material as described in claim 1, which is characterized in that repair on the surface
Decorations include carrying out corner angle, grinding and screening to acicular petroleum coke particle；The flatbed lithium ion battery graphite cathode material
Particle is preferably graphitized with platform model, structural stability and intensity.
3. flatbed lithium ion battery graphite cathode material as described in claim 1, which is characterized in that the petroleum coke
Particle is acicular petroleum coke particle, and median particle diameter DV50 is 5-30 μm.
4. flatbed lithium ion battery graphite cathode material as described in claim 1, which is characterized in that the class geometry
The mass percent of body petroleum coke particles and forming adhesive is class solid petroleum coke particles 1-30%, bonding agent 70-99%.
5. flatbed lithium ion battery graphite cathode material as described in claim 1, which is characterized in that the molding is viscous
The median particle diameter DV50 for connecing agent is 1-20 μm.
6. flatbed lithium ion battery graphite cathode material as described in claim 1, which is characterized in that the molding is viscous
Connecing agent is macromolecule high polymer bonding agent, and macromolecule high polymer bonding agent is a kind of or more in coal, oil system pitch or phenolic resin
Kind.
7. a kind of preparation method of any flatbed lithium ion battery graphite cathode material of claim 1-6, feature exist
In, including the following steps:
S1: modifying acicular petroleum coke particle surface, including goes corner angle, grinding and screening sub-material, after being modified
Class solid structure petroleum coke particles；
S2: class solid structure petroleum coke particles being mixed with forming adhesive and are homogenized to obtain mixed material, right later
Mixed material is heat-treated, while carrying out high-speed stirred to mixed material in fixed thermal response container, to mixed material shape
At centrifugation extruding force, forming adhesive keeps the big plane of class solid structure petroleum coke particles mutually right under the effect of strong centrifugal force
Type is connected into get the graphite particle of microcosmic flatbed structure.
8. the preparation method of flatbed lithium ion battery graphite cathode material as claimed in claim 7, which is characterized in that described
Heat treatment process is the temperature programming under protective atmosphere, heating rate 10~15 DEG C/min, heat-treatment temperature range 25-900
℃。
9. the preparation method of flatbed lithium ion battery graphite cathode material as claimed in claim 7, which is characterized in that described
The internal volume of fixed thermal response container and the volume accounting of mixed material are 3-5:1.
10. the preparation method of flatbed lithium ion battery graphite cathode material as claimed in claim 7, which is characterized in that described
High-speed stirred be 600~1200r/min.
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Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000058052A (en) * | 1998-08-05 | 2000-02-25 | Osaka Gas Co Ltd | Negative electrode carbon material for lithium secondary battery, its manufacture, and lithium secondary battery using the material |
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