CN109742356A - A kind of preparation method of graphite cathode material - Google Patents
A kind of preparation method of graphite cathode material Download PDFInfo
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Abstract
The present invention provides a kind of preparation methods of graphite cathode material, first micro- expansion layer natural graphite is heat-treated, then micro- expansion layer natural graphite after heat treatment is mixed with binder, mixture is subjected to kneading granulation, it is carbonized, sieves to get graphite cathode material of the present invention is arrived in an inert atmosphere again.The present invention solves graphite in the prior art and expands that layer rear surface pattern is roughening, tap density decline, is unfavorable for the problems such as processing of negative electrode slurry.
Description
Technical field
The present invention relates to lithium ion battery negative material preparation and its applied technical fields, and in particular to a kind of graphite cathode
The preparation method of material.
Background technique
Carbon material has many advantages, such as that capacity height, Li insertion extraction good reversibility, potential plateau is low and cycle performance is excellent, is
It the main negative electrode material of 3C electronic product and is widely applied, and gradually expanding is electric car (EV) and mixing is electric
Electrical automobile (HEV) uses power supply.Therefore, development and application high performance electrode material is vital.Currently, lithium ion battery master
Will using graphite type material as negative electrode material, traditional graphite negative electrodes material in its cyclic process there are Cycle Difference, it is forthright again
Can be poor the problems such as.
Lithium ion can only be embedded in from the end face of graphite, therefore the diffusion coefficient of lithium ion disengaging graphite linings is small, directly
Lead to the high rate performance that lithium ion battery is poor.In addition, under high magnification when charge and discharge, when lithium ion has little time to diffuse into stone
When between layer of ink, lithium ion concentrates on negative electrode surface and is reduced into the high metal Li dendrite of activity.Metal Li dendrite holds
It is easily reacted with electrolyte, consumes electrolyte, reduce battery capacity, the serious curtailment cycle life of battery.And lithium metal
Dendrite is easy to pierce through diaphragm, causes positive and negative anodes directly to contact, so as to cause battery short circuit, brings safety problem.
The method of high rate performance is improved mainly there are two aspect, method is first is that reduce the granularity of graphite cathode material.Granularity
Small, lithium ion diffusion length is short, and multiplying power discharging property improves.But when undersized, the packed density of active material is reduced, from
And battery capacity is caused to decline.Second is that expanding the interlamellar spacing of graphite material, raising lithium ion changes method in the diffusion velocity of interlayer
Kind high rate performance.From the foregoing, it will be observed that expanding interlamellar spacing is to obtain good rate capability, active matter in the case where keeping certain particle size
The optimal path for the graphite cathode material that matter packed density is high, preparation battery capacity is high.
It is raw material that the preparation process for expanding layer natural graphite micro- at present, which mainly passes through graphite, and inorganic acid or organic acid are intercalation
Agent expands its interlamellar spacing slightly, to improve its high rate performance under certain oxidant effect.But expand after layer, graphite
Surface topography it is roughening, jolt ramming can also decline, these are all unfavorable for the processing of negative electrode slurry.
Summary of the invention
The purpose of the invention is to overcome the deficiencies of the prior art and provide a kind of preparation side of new graphite cathode material
Method.
The present invention is achieved by the following technical programs:
A kind of preparation method of graphite cathode material, comprising the following steps:
S1, micro- expansion layer natural graphite is heat-treated, then carries out micro- expansion layer natural graphite after heat treatment with binder
Mixing, then mixture is subjected to kneading granulation, it is granulated and obtains the particle that granule size is 5 μm -30 μm；
S2,5 μm -30 μm of particle is carbonized in an inert atmosphere, sieves particle after carbonization, screenings is 5 μm -30
μm graphite cathode material.
Preferably, in step S1, micro- granular size for expanding layer natural graphite is 5 μm -30 μm.
Preferably, in step S1, micro- volume expansion multiple for expanding layer natural graphite is 1.1-5 times.
Preferably, in step S1, the heat treatment are as follows: with 2 DEG C/min~5 DEG C/min heating rate, by room temperature
To 200 DEG C~1500 DEG C, constant temperature time 3-8h.
Preferably, in step S1, micro- expansion layer natural graphite after heat treatment is mixed with binder, forms mixing
Object；Wherein, micro- content for expanding layer natural graphite is the 50%~98% of mixture by mass percentage, the binder
Content be by mass percentage the 2%~50% of mixture, micro- expansion the sum of the layer natural graphite and the content of binder are
100%。
Preferably, in step S1, the binder is selected from coal tar pitch and petroleum asphalt, mesophase pitch, resinae, cellulose
And one of macromolecule hydrocarbon or a variety of.
Preferably, in step S1, the mixed mode is in VC mixing, V-type mixing, the mixing of Y type and air-flow mixing
It is one or more.
Preferably, in step S1, the heating temperature that the kneading is granulated is 300-650 DEG C, constant temperature time 2-8h.
Preferably, in step S2, the inert atmosphere is nitrogen, helium, neon, argon gas, Krypton, one in xenon atmosphere
Kind is a variety of.
Preferably, in step S2, the carbonization is with 2 DEG C/min~5 DEG C/min heating rate, by room temperature to 600
DEG C~1500 DEG C, constant temperature time 3-8h.
Compared with prior art, the present invention lithium ion insertion hinders first is that making full use of micro- expansion layer natural graphite interlamellar spacing big
Power is small, and for micro- expansion layer natural graphite after Overheating Treatment, there are more active sites on surface, is more advantageous to the insertion of lithium ion, and
Be conducive to the uniform combination of binder, it is easier to carry out the cladding of next step.Second is that using the method being granulated that micro- expansion layer is natural
Graphite, which is bonded together, forms an irregular graphite particle, and graphite particle is in anisotropic elastic solid, lithium ion diffusion system
Number is big, and high rate performance is excellent, and has carried out carbon coating and carbonization treatment to the graphite cathode material, further improves graphite
The dynamic performance of negative electrode material.Third is that integration is granulated and cladding process, save the cost.The technology ensure that the granularity of particle,
It can be realized higher compacted density simultaneously, dynamic performance is substantially improved, and cycle performance also greatly improves.
The present invention is by the Surface heat-treatent to micro- expansion layer natural graphite, under the premise of keeping the structure of graphite flake layer,
More active sites (oxygen-containing functional group/or defect) are generated on surface.Be granulated cladding process treatment process in, binder with have
Micro- expansion layer natural graphite of more oxygen-containing functional group uniformly combines, while realizing that micro- expansion layer natural graphite is granulated.After carbonization, lithium
Ion diffusion admittance increases, and high rate performance is more preferable, also improves tap density, solves graphite in the prior art and expands table after layer
Face pattern is roughening, tap density decline, is unfavorable for the problems such as processing of negative electrode slurry.
Detailed description of the invention
Fig. 1 is process flow diagram of the invention.
Fig. 2 is the scanning electron microscope (SEM) photograph of graphite cathode material prepared by the present invention.
Fig. 3 is all charging and discharging curves of head of graphite cathode material prepared by the present invention.
Fig. 4 is appearance of the graphite cathode material for preparing respectively of the embodiment of the present invention 1 and comparative example 1 after 1C is recycled 300 weeks
Measure conservation rate comparison diagram.
Specific embodiment
Combined with specific embodiments below 1~10 and comparative example 1 the invention will be further described, comparative example 1 be existing skill
Art, Examples 1 to 10 are specific implementation case of the invention.
Comparative example 1
Micro- expansion layer natural graphite: by certain technique that graphite flake layer is micro- swelling, both can be relieved the embedding de- process of lithium ion causes
Volume expansion and contraction, improve the cycle performance of graphite cathode, and lithium ion diffusion admittance can be widened, it is forthright again to improve it
Energy.Micro- expansion layer natural graphite, CMC and SBR are uniformly mixed by the mass ratio of 96.5 ︰, 1.5 ︰ 2, slurry is made, is coated on copper foil
On, working electrode is made by drying, roll-in and punching.Button cell is assembled in the glove box full of argon gas and carries out, with gold
Belonging to lithium foil is to electrode, and diaphragm is poly- second/propylene composite micro porous film, and electrolyte is 1M LiPF6/ (EC:EMC) (3:7), electrification
It learns performance test to carry out on cell tester, charge-discharge magnification 0.1C, voltage range is between 0.005-2V.It takes off for the first time
Lithium capacity is 362.3mAh/g, coulombic efficiency 93.1%.Using this graphite material as cathode, cobalt acid lithium is anode, 1M LiPF6/
(EC:DMC:EMC) (1:1:1) is that electrolyte makes full battery, and charging/discharging voltage range is 3.0-4.2V, carries out room temperature using 1C
Charge and discharge cycles, 1C and 5C carry out multiplying power discharging property test.Capacity retention ratio is 80.1%, 5C/1C's after 1C is recycled 300 weeks
Capacity retention ratio is 79.5%.
Embodiment 1
As shown in Figure 1, micro- expansion layer natural graphite that average grain diameter is 5 μm and volume expansion multiple is 2 times is placed in tube furnace
In, in air atmosphere, 200 DEG C are warming up to 3 DEG C/min, constant temperature 3h.After cooling, VC is carried out with coal tar pitch to mix, mix
At homogeneous material, the mass ratio of coal tar pitch in the mixture is 40%.Add mixture to while stirring/while heating device, heating
Temperature is 300 DEG C -650 DEG C, and constant temperature time is 2-8 hours.Then cooling sample is placed on the carbide furnace full of nitrogen atmosphere
Middle carbonization is warming up to 800 DEG C with 3 DEG C/min, constant temperature 3h.Particle is sieved after carbonization, screenings is 10.8 μm of stone
Black negative electrode material.
Button cell is prepared using method identical with comparative example and carries out electrochemical property test, taking off lithium capacity for the first time is
358.6mAh/g, coulombic efficiency 96.1%.Using this graphite material as cathode, cobalt acid lithium is anode, 1M LiPF6/ (EC:DMC:
EMC) (1:1:1) is that electrolyte makes full battery, and charging/discharging voltage range is 3.0-4.2V, carries out room temperature charge and discharge using 1C and follows
Ring, 1C and 5C carry out multiplying power discharging property test.The electron microscope of the graphite cathode material of preparation is as shown in Fig. 2, the graphite prepared
The all charging and discharging curves of the head of negative electrode material are as shown in Figure 3.The appearance that capacity retention ratio of the 1C circulation after 300 weeks is 90.9%, 5C/1C
Measuring conservation rate is 87.6%, as shown in Figure 4.
Embodiment 2
Micro- expansion layer natural graphite that average grain diameter is 10.1 μm and volume expansion multiple is 1.5 times is placed in tube furnace,
Under air atmosphere, 600 DEG C are warming up to 2 DEG C/min, constant temperature 3h.After cooling, VC is carried out with asphalt to mix, be mixed into
Even material, the mass ratio of coal tar pitch in the mixture are 10%.Add mixture to while stirring/while heating device, heating temperature
It is 300 DEG C -650 DEG C, constant temperature time is 2-8 hours.Then cooling sample is placed on carbon in the carbide furnace full of helium atmosphere
Change, is warming up to 950 DEG C with 2 DEG C/min, constant temperature 3h.Particle is sieved after carbonization, screenings is that 17.6 μm of graphite is negative
Pole material.
Button cell is prepared using method identical with comparative example and carries out electrochemical property test, taking off lithium capacity for the first time is
358.3mAh/g, coulombic efficiency 92.7%.Using this graphite material as cathode, cobalt acid lithium is anode, 1M LiPF6/ (EC:DMC:
EMC) (1:1:1) is that electrolyte makes full battery, and charging/discharging voltage range is 3.0-4.2V, carries out room temperature charge and discharge using 1C and follows
Ring, 1C and 5C carry out multiplying power discharging property test.Capacity retention ratio after 1C is recycled 300 weeks is protected for the capacity of 91.5%, 5C/1C
Holdup is 89.2%.
Embodiment 3
Micro- expansion layer natural graphite that average grain diameter is 8.0 μm and volume expansion multiple is 1.5 times is placed in tube furnace, in nitrogen
Under gas atmosphere, 1000 DEG C are warming up to 5 DEG C/min, constant temperature 3h.After cooling, Y type is carried out with phenolic resin to mix, be mixed into
Even material, the mass ratio of phenolic resin in the mixture are 15%.Add mixture to while stirring/while heating device, heating temperature
Degree is 300 DEG C -650 DEG C, and constant temperature time is 2-8 hours.Then cooling sample is placed in the carbide furnace full of argon atmosphere
Carbonization, is warming up to 1200 DEG C with 5 DEG C/min, constant temperature 4h.Particle is sieved after carbonization, screenings is 10.5 μm of graphite
Negative electrode material.
Button cell is prepared using method identical with comparative example and carries out electrochemical property test, taking off lithium capacity for the first time is
360.1mAh/g, coulombic efficiency 93.1%.Using this graphite material as cathode, cobalt acid lithium is positive, 1M LiPF6/(EC:DMC:
EMC) (1:1:1) is that electrolyte makes full battery, and charging/discharging voltage range is 3.0-4.2V, carries out room temperature charge and discharge using 1C and follows
Ring, 1C and 5C carry out multiplying power discharging property test.Capacity retention ratio after 1C is recycled 300 weeks is protected for the capacity of 90.8%, 5C/1C
Holdup is 91.5%.
Embodiment 4
Micro- expansion layer natural graphite that average grain diameter is 14.5 μm and volume expansion multiple is 2.5 times is placed in tube furnace,
Under argon atmosphere, 1400 DEG C are warming up to 2 DEG C/min, constant temperature 5h.After cooling, Y type is carried out with coal tar pitch to mix, be mixed into
Even material, the mass ratio of coal tar pitch in the mixture are 25%.Add mixture to while stirring/while heating device, heating temperature
It is 300 DEG C -650 DEG C, constant temperature time is 2-8 hours.Then cooling sample is placed on carbon in the carbide furnace full of helium atmosphere
Change, is warming up to 1150 DEG C with 3 DEG C/min, constant temperature 4h.Particle is sieved after carbonization, screenings is that 23.6 μm of graphite is negative
Pole material.
Button cell is prepared using method identical with comparative example and carries out electrochemical property test, taking off lithium capacity for the first time is
359.7mAh/g, coulombic efficiency 93.0%.Using this graphite material as cathode, cobalt acid lithium is positive, 1M LiPF6/(EC:DMC:
EMC) (1:1:1) is that electrolyte makes full battery, and charging/discharging voltage range is 3.0-4.2V, carries out room temperature charge and discharge using 1C and follows
Ring, 1C and 5C carry out multiplying power discharging property test.Capacity retention ratio after 1C is recycled 300 weeks is protected for the capacity of 91.4%, 5C/1C
Holdup is 89.6%.
Embodiment 5
Micro- expansion layer natural graphite that average grain diameter is 7.3 μm and volume expansion multiple is 1 times is placed in tube furnace, in nitrogen
Under atmosphere, 800 DEG C are warming up to 3 DEG C/min, constant temperature 3h.After cooling, VC is carried out with coal tar pitch to mix, be mixed into uniform object
Material, the mass ratio of coal tar pitch in the mixture are 2%.Add mixture to while stirring/while heating device, heating temperature 300
DEG C -650 DEG C, constant temperature time is 2-8 hours.Then cooling sample is placed in the carbide furnace full of nitrogen atmosphere and is carbonized, with 3
DEG C/min is warming up to 1250 DEG C, constant temperature 4h.Particle is sieved after carbonization, screenings is 9.7 μm of graphite cathode material.
Button cell is prepared using method identical with comparative example and carries out electrochemical property test, taking off lithium capacity for the first time is
348.3mAh/g, coulombic efficiency 92.7%.Using this graphite material as cathode, cobalt acid lithium is positive, 1M LiPF6/(EC:DMC:
EMC) (1:1:1) is that electrolyte makes full battery, and charging/discharging voltage range is 3.0-4.2V, carries out room temperature charge and discharge using 1C and follows
Ring, 1C and 5C carry out multiplying power discharging property test.Capacity retention ratio after 1C is recycled 300 weeks is protected for the capacity of 92.8%, 5C/1C
Holdup is 92.1%.
Embodiment 6
Micro- expansion layer natural graphite that average grain diameter is 14.2 μm and volume expansion multiple is 2 times is placed in tube furnace, in argon
Under gas atmosphere, 900 DEG C are warming up to 5 DEG C/min, constant temperature 6h.After cooling, VC is carried out with epoxy resin to mix, be mixed into uniformly
Material, the mass ratio of coal tar pitch in the mixture are 30%.Add mixture to while stirring/while heating device, heating temperature is
300 DEG C -650 DEG C, constant temperature time is 2-8 hours.Then cooling sample is placed in the carbide furnace full of nitrogen atmosphere and is carbonized,
850 DEG C are warming up to 3 DEG C/min, constant temperature 3h.Particle is sieved after carbonization, screenings is 18.8 μm of graphite cathode material
Material.
Button cell is prepared using method identical with comparative example and carries out electrochemical property test, taking off lithium capacity for the first time is
357.2mAh/g, coulombic efficiency 92.5%.Using this graphite material as cathode, cobalt acid lithium is positive, 1M LiPF6/(EC:DMC:
EMC) (1:1:1) is that electrolyte makes full battery, and charging/discharging voltage range is 3.0-4.2V, carries out room temperature charge and discharge using 1C and follows
Ring, 1C and 5C carry out multiplying power discharging property test.Capacity retention ratio after 1C is recycled 300 weeks is protected for the capacity of 90.7%, 5C/1C
Holdup is 92.5%.
Embodiment 7
Micro- expansion layer natural graphite that average grain diameter is 12.3 μm and volume expansion multiple is 1.5 times is placed in tube furnace,
Under nitrogen atmosphere, 1200 DEG C are warming up to 3 DEG C/min, constant temperature 3h.After cooling, VC is carried out with asphalt to mix, be mixed into
Homogeneous material, the mass ratio of coal tar pitch in the mixture are 25%.Add mixture to while stirring/while heating device, heating temperature
Degree is 300 DEG C -650 DEG C, and constant temperature time is 2-8 hours.Then cooling sample is placed in the carbide furnace full of neon atmosphere
Carbonization, is warming up to 1150 DEG C with 4 DEG C/min, constant temperature 3h.Particle is sieved after carbonization, screenings is 19.2 μm of graphite
Negative electrode material.
Button cell is prepared using method identical with comparative example and carries out electrochemical property test, taking off lithium capacity for the first time is
358.6mAh/g, coulombic efficiency 92.9%.Using this graphite material as cathode, cobalt acid lithium is positive, 1M LiPF6/(EC:DMC:
EMC) (1:1:1) is that electrolyte makes full battery, and charging/discharging voltage range is 3.0-4.2V, carries out room temperature charge and discharge using 1C and follows
Ring, 1C and 5C carry out multiplying power discharging property test.Capacity retention ratio after 1C is recycled 300 weeks is protected for the capacity of 91.3%, 5C/1C
Holdup is 93.3%.
Embodiment 8
Micro- expansion layer natural graphite that average grain diameter is 10.7 μm and volume expansion multiple is 1.5 times is placed in tube furnace,
Under air atmosphere, 1500 DEG C are warming up to 3 DEG C/min, constant temperature 4h.After cooling, VC is carried out with mesophase pitch to mix, mix
At homogeneous material, the mass ratio of mesophase pitch in the mixture is 25%.Add mixture to while stirring/while heating device,
Heating temperature is 300 DEG C -650 DEG C, and constant temperature time is 2-8 hours.Then cooling sample is placed on the carbon full of Krypton atmosphere
Change and be carbonized in furnace, is warming up to 1050 DEG C with 4 DEG C/min, sieves particle after constant temperature 4h. carbonization, screenings is 18.4 μm
Graphite cathode material.
Button cell is prepared using method identical with comparative example and carries out electrochemical property test, taking off lithium capacity for the first time is
359.1mAh/g, coulombic efficiency 92.8%.Using this graphite material as cathode, cobalt acid lithium is positive, 1M LiPF6/(EC:DMC:
EMC) (1:1:1) is that electrolyte makes full battery, and charging/discharging voltage range is 3.0-4.2V, carries out room temperature charge and discharge using 1C and follows
Ring, 1C and 5C carry out multiplying power discharging property test.Capacity retention ratio after 1C is recycled 300 weeks is protected for the capacity of 91.8%, 5C/1C
Holdup is 93.9%.
Embodiment 9
It is placed in average grain diameter is 27.0 μm and volume expansion multiple is 2 times micro- expansion layer natural graphite is broken in tube furnace,
Under air atmosphere, 600 DEG C are warming up to 3 DEG C/min, constant temperature 3h.After cooling, VC is carried out with coal tar pitch to mix, be mixed into uniformly
Material, the mass ratio of coal tar pitch in the mixture are 22%.Add mixture to while stirring/while heating device, heating temperature is
300 DEG C -650 DEG C, constant temperature time is 2-8 hours.Then cooling sample is placed in the carbide furnace full of nitrogen atmosphere and is carbonized,
850 DEG C are warming up to 2 DEG C/min, constant temperature 5h.Particle is sieved after carbonization, screenings is 29.8 μm of graphite cathode material
Material.
Button cell is prepared using method identical with comparative example and carries out electrochemical property test, taking off lithium capacity for the first time is
357.6mAh/g, coulombic efficiency 92.5%.Using this graphite material as cathode, cobalt acid lithium is positive, 1M LiPF6/(EC:DMC:
EMC) (1:1:1) is that electrolyte makes full battery, and charging/discharging voltage range is 3.0-4.2V, carries out room temperature charge and discharge using 1C and follows
Ring, 1C and 5C carry out multiplying power discharging property test.Capacity retention ratio after 1C is recycled 300 weeks is protected for the capacity of 89.7%, 5C/1C
Holdup is 88.2%.
Embodiment 10
Micro- expansion layer natural graphite that average grain diameter is 12.3 μm and volume expansion multiple is 5 times is placed in tube furnace, in oxygen
Under gas atmosphere, 1200 DEG C are warming up to 4 DEG C/min, constant temperature 8h.After cooling, VC is carried out with asphalt to mix, be mixed into
Even material, the mass ratio of asphalt in the mixture are 20%.Add mixture to while stirring/while heating device, heating temperature
Degree is 300 DEG C -650 DEG C, and constant temperature time is 2-8 hours.Then cooling sample is placed in the carbide furnace full of nitrogen atmosphere
Carbonization, is warming up to 800 DEG C with 3 DEG C/min, constant temperature 3h.Particle is sieved after carbonization, screenings is 18.7 μm of graphite
Negative electrode material.
Button cell is prepared using method identical with comparative example and carries out electrochemical property test, taking off lithium capacity for the first time is
358.2mAh/g, coulombic efficiency 92.2%.Using this graphite material as cathode, cobalt acid lithium is positive, 1M LiPF6/(EC:DMC:
EMC) (1:1:1) is that electrolyte makes full battery, and charging/discharging voltage range is 3.0-4.2V, carries out room temperature charge and discharge using 1C and follows
Ring, 1C and 5C carry out multiplying power discharging property test.Capacity retention ratio after 1C is recycled 300 weeks is protected for the capacity of 91.7%, 5C/1C
Holdup is 92.5%.
Performance test comparison
The graphite cathode material of graphite cathode material and prior art preparation prepared by above-described embodiment 1~10 is fabricated to button
Battery carries out electrochemical property test, and result is as shown in the table:
As can be seen from the above table, graphite cathode material prepared by the present invention has good cycle performance, 5C/1C capacity retention ratio
> 89% is much better than the 79.5% of comparative example.
Claims (10)
1. a kind of preparation method of graphite cathode material, which comprises the following steps:
S1, micro- expansion layer natural graphite is heat-treated, then carries out micro- expansion layer natural graphite after heat treatment with binder
Mixing, then mixture is subjected to kneading granulation, it is granulated and obtains the particle that granule size is 5 μm -30 μm；
S2,5 μm -30 μm of particle is carbonized in an inert atmosphere, sieves particle after carbonization, screenings is 5 μm -30
μm graphite cathode material.
2. a kind of preparation method of graphite cathode material according to claim 1, it is characterised in that: described in step S1
Micro- granular size for expanding layer natural graphite is 5 μm -30 μm.
3. a kind of preparation method of graphite cathode material according to claim 1, it is characterised in that: described in step S1
Micro- volume expansion multiple for expanding layer natural graphite is 1.1-5 times.
4. a kind of preparation method of graphite cathode material according to claim 1, it is characterised in that: described in step S1
Heat treatment are as follows: with 2 DEG C/min~5 DEG C/min heating rate, by room temperature to 200 DEG C~1500 DEG C, constant temperature time 3-8h.
5. a kind of preparation method of graphite cathode material according to claim 1, it is characterised in that:, will be hot in step S1
Treated, and micro- expansion layer natural graphite is mixed with binder, forms mixture；Wherein, micro- layer natural graphite of expanding contains
Amount is the 50%~98% of mixture by mass percentage, and the content of the binder is mixture by mass percentage
2%~50%, the sum of described micro- content for expanding layer natural graphite and binder is 100%.
6. a kind of preparation method of graphite cathode material according to claim 1 or 5, it is characterised in that: in step S1, institute
Stating binder is one in selected from coal tar pitch and petroleum asphalt, mesophase pitch, resinae, cellulose and macromolecule hydrocarbon
Kind is a variety of.
7. a kind of preparation method of graphite cathode material according to claim 1, it is characterised in that: described in step S1
Mixed mode is one of VC mixing, V-type mixing, the mixing of Y type and air-flow mixing or a variety of.
8. a kind of preparation method of graphite cathode material according to claim 1, it is characterised in that: described in step S1
The heating temperature that kneading is granulated is 300-650 DEG C, constant temperature time 2-8h.
9. a kind of preparation method of graphite cathode material according to claim 1, it is characterised in that: described in step S2
Inert atmosphere is one of nitrogen, helium, neon, argon gas, Krypton, xenon atmosphere or a variety of.
10. a kind of preparation method of graphite cathode material according to claim 1, it is characterised in that: described in step S2
Carbonization is with 2 DEG C/min~5 DEG C/min heating rate, by room temperature to 600 DEG C~1500 DEG C, constant temperature time 3-8h.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112047335A (en) * | 2020-08-31 | 2020-12-08 | 湖南宸宇富基新能源科技有限公司 | Combined treatment method for black powder of waste lithium ion battery |
| CN112624100A (en) * | 2020-12-22 | 2021-04-09 | 鸡西市唯大新材料科技有限公司 | Preparation method of micro-expanded natural graphite negative electrode material |
| CN112670463A (en) * | 2020-04-16 | 2021-04-16 | 宁波杉杉新材料科技有限公司 | Graphite negative electrode material and preparation method and application thereof |
| CN113113572A (en) * | 2021-03-11 | 2021-07-13 | 广东海洋大学 | High-rate natural graphite-based composite material for lithium ion battery and preparation method and application thereof |
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| CN113113572A (en) * | 2021-03-11 | 2021-07-13 | 广东海洋大学 | High-rate natural graphite-based composite material for lithium ion battery and preparation method and application thereof |
| CN113113572B (en) * | 2021-03-11 | 2022-10-21 | 广东海洋大学 | High-rate natural graphite-based composite material for lithium ion battery and preparation method and application thereof |
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