CN108933240A - A kind of preparation method and negative electrode material of high-density lithium ion battery negative electrode material - Google Patents
A kind of preparation method and negative electrode material of high-density lithium ion battery negative electrode material Download PDFInfo
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Abstract
The high-density lithium ion battery negative electrode material that the present invention provides a kind of preparation method of high-density lithium ion battery negative electrode material and obtains.The method makes the modified negative electrode material of high-energy density have fine and close internal structure, reduces graphite particle internal void, reduces expansion, so as to improve the cycle performance of material, improve discharge capacity and cycle efficieny.The high-density lithium ion battery negative electrode material that the present invention obtains mainly has the advantage that a. tap density >=1.10g/cm3；B. chemical property discharge capacity is in 360mAh/g or more；C. good cycle, 300 capacity retention ratio >=95% of cycle-index, preferable to the adaptability of electrolyte, the ability of electrolyte resistance is strong.In addition, preparation method of the invention is simple, the prospect with industrialized production.
Description
Technical field
The invention belongs to technical field of material chemistry, and in particular to a kind of preparation method of high-density lithium ion battery negative electrode material
And negative electrode material.
Background technique
In recent years, the more and more functionalization of consumer electronics product in this way need the energy density of battery higher and higher.
Therefore it improves the specific capacity of lithium ion battery negative material, reduce emphasis of the irreversible capacity as research and development for the first time.Lithium from
Sub- secondary battery cathode material mainly includes at present artificial graphite and natural graphite class, artificial graphite mainly based on graphite-like
It is to be prepared using burnt class carbon precursor graphitization, preparation cost is higher, and energy density is promoted relatively difficult.Natural graphite
There is high degree of graphitization and ideal layer structure, while its low manufacture cost after treatment, layer structure adds in crushing
It will appear gap during work, will increase the consumption of electrolyte in this way, reduce first charge discharge efficiency, can also make battery phase after cycling
There is circulation and jumps the decaying of precipice formula.Therefore, this patent purpose is that natural graphite existing structure is overcome to be modified place to natural graphite
Reason.
Chinese patent 201611195178.1, which is disclosed, carries out densification modification for natural graphite, will be weighed using external pressure
Matter oil pressure plays filling effect to material internal, obtains amorphous carbon structural material by carbonization treatment.At the static pressure such as the method
Natural graphite can be compressed under the effect of external force after reason, and intralayer defects can reduce, but since natural graphite material is relatively soft,
Obtained densification effect is bad.Chinese patent 201410784439.8 discloses self-baking mesocarbon microspheres by molding
Preforming, hot isostatic pressing and graphitizable high temperature processing, crushing and classification obtain graphite material, but in the pulverization process process in later period
A large amount of fault in material can be introduced, is had a certain impact to the chemical property of material.
Summary of the invention
In order to solve the internal voids that existing natural graphite generates during the preparation process, improves internal voids structure, cause
Densification process process solves internal voids and exists to cause more electrolyte consume, reduction material energy densities and cycle performance
Defect, the present invention provide a kind of high-density lithium ion battery cathode material preparation method, with modification natural stone of the invention
Ink has the performance of first charge-discharge efficiency height and high guarantor's liquid as the lithium ion battery of negative electrode material.
The object of the present invention is to provide a kind of preparation methods of high-density lithium ion battery negative electrode material.
It is a further object of the present invention to provide a kind of high-density lithium ion battery negative electrode materials that above-mentioned preparation method obtains.
The preparation method of the high-density lithium ion battery negative electrode material of specific embodiment according to the present invention, including following step
It is rapid:
(1) it is the high-purity natural graphite of 10:1~100 and carbonaceous mesophase spherules by weight ratio, is sufficiently mixed, obtains mixture；
The high-purity natural graphite is ash content less than 0.05%, and iron content is less than the spherical natural graphite of 100ppm；
(2) mixture that step (1) obtains compression molding is carried out to handle to obtain block；
(3) block for obtaining step (2) carries out disaggregation processing, obtains modified powder；
(4) modified powder that step (3) obtains is stirred with noncrystalline carbon precursor, before the noncrystalline charcoal
The weight ratio for driving body and high-purity natural graphite is 0.5~5:10, is carried out at charing in inert gas at 600~1500 DEG C
Reason, obtains high-density lithium ion battery negative electrode material.
The preparation method of the high-density lithium ion battery negative electrode material of specific embodiment according to the present invention, it is preferable that step
Suddenly in (1), the D50 value of the high-purity natural graphite is 6~20 μm, and the D50 value of the carbonaceous mesophase spherules is 8~25 μm.
D50 of the present invention is volume average particle size, refers to that the cumulative particle sizes percentile an of sample reaches 50%
When corresponding partial size, physical significance is that partial size is greater than its particle and accounts for 50%, and the particle less than it also accounts for 50%；The day
The pattern of right graphite can be the pattern of this field routine, such as spherical, spherical or elliposoidal.Carbonaceous mesophase spherules material is
The various common carbonaceous mesophase spherules materials of this field routine, for the carbonaceous mesophase spherules material after graphitization.
The preparation method of the high-density lithium ion battery negative electrode material of specific embodiment according to the present invention, it is preferable that step
Suddenly in (2), the pressure of the compression molding is 50~120MPa, and the time is 0.5~3h；It is further preferred that described be molded into
The pressure of type is 80~100MPa, and the time is 0.5~1h.Compression molding can reduce the defect inside natural graphite, to electrolysis
The consumption of liquid is reduced, and the pressure of compression molding and time have certain influence to the density of jolt ramming, when the pressure of compression molding
For 50~120MPa, the time is 0.5~3h thing, and tap density improves, when the pressure of compression molding is 80~100MPa, time
When for 0.5~1h, tap density is significantly greatly increased, and is reduced to binder demand, is promoted the active material quality of negative electrode material, is increased
Energy density.
The preparation method of the high-density lithium ion battery negative electrode material of specific embodiment according to the present invention, it is preferable that step
Suddenly in (3), the method for the disaggregation processing is to be mechanically pulverized, and it is round or stick latch structure that the cutter head used, which is mechanically pulverized,.Circle
Shape cutter head or stick latch structure disintegrating apparatus can reduce equipment in depolymehzation process and the extent of the destruction of material reduced surface and lacked
It falls into, promotes the surface characteristic of material.
The preparation method of the high-density lithium ion battery negative electrode material of specific embodiment according to the present invention, it is preferable that step
Suddenly in (3), the D50 value of the modified powder is 8~25 μm.Pass through mechanical disaggregation processing, the reunion of obtained modified powder
Phenomenon is improved, granularity refinement, is stablized.
The preparation method of the high-density lithium ion battery negative electrode material of specific embodiment according to the present invention, it is preferable that step
Suddenly in (4), the noncrystalline carbon precursor is coal tar pitch and/or asphalt；It is further preferred that the noncrystalline charcoal forerunner
Body is asphalt, and the control of asphalt sulfur is low, from a wealth of sources.
The preparation method of the high-density lithium ion battery negative electrode material of specific embodiment according to the present invention, it is preferable that step
Suddenly in (4), the average grain diameter of the noncrystalline carbon precursor is 1~5 μm, it is further preferred that the noncrystalline carbon precursor
Average grain diameter be 1~3 μm, the quantity of particle is more under the smaller phase homogenous quantities of granularity, and such pitch is assembled more in particle surface
Uniformly.
The preparation method of the high-density lithium ion battery negative electrode material of specific embodiment according to the present invention, it is preferable that step
Suddenly in (4), the temperature of the charing process is 1000~1200 DEG C, and the inert gas is nitrogen, and the purity of the nitrogen is
99.99% or more, the flow of the nitrogen is 0.1~2.0m3/h。
The specific embodiment of the invention also provides the high-density lithium ion battery negative electrode material that above-mentioned preparation method obtains.
The invention has the benefit that
The present invention a kind of preparation method of high-density lithium ion battery negative electrode material is provided and its obtained high density lithium from
Sub- cell negative electrode material.The method makes the modified negative electrode material of high-energy density have fine and close internal structure, reduces graphite
Particle internal void reduces expansion so as to improve the cycle performance of material, improves discharge capacity and cycle efficieny.The present invention obtains
To high-density lithium ion battery negative electrode material mainly have the advantage that
A. tap density >=1.10g/cm3；B. chemical property discharge capacity is in 360mAh/g or more；C. cycle performance
Good, the adaptability of 300 capacity retention ratio >=95% of cycle-index, material on electrolyte is preferable, and the ability of electrolyte resistance is strong.This
Outside, preparation method of the invention is simple, the prospect with industrialized production.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the cycle life curve for the battery that the negative electrode material obtained using embodiment 1 and comparative example 1 is obtained.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, technical solution of the present invention will be carried out below
Detailed description.Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are obtained all without making creative work
Other embodiment belongs to the range that the present invention is protected.
In following embodiments, the source of some materials is as follows, remaining is conventional commercial product:
Natural graphite is the spherical graphite of wide star electronics graphite Co., Ltd production, and D50 value is 6~20 μm.
Asphalt is the MQ-250 pitch that the production of Dehua work Materials Co., Ltd is believed in Liaoning；
Carbonaceous mesophase spherules are the interphase of TaiWan, China China Steel Chemical Co., Ltd. production；
Following percentages as described in the examples are weight percentage unless otherwise specified.
Embodiment 1
The preparation method of high-density lithium ion battery negative electrode material, comprising the following steps:
(1) it is 100:10 high-purity natural graphite and carbonaceous mesophase spherules by weight ratio, is sufficiently mixed, obtains mixture；Institute
The high-purity natural graphite stated is ash content less than 0.05%, and iron content is less than the spherical natural graphite of 100ppm, the high-purity natural
The D50 value of graphite is 15 μm, and the D50 value of the carbonaceous mesophase spherules agent is 8 μm；
(2) mixture that step (1) obtains is carried out compression molding to handle to obtain block, the pressure of the compression molding is
100MPa, time 1h；
(3) block for obtaining step (2) carries out disaggregation processing, obtains modified powder, the method for the disaggregation processing is
It is mechanically pulverized, it is circular configuration that the cutter head used, which is mechanically pulverized, and the D50 value of the modified powder is 25 μm；
(4) modified powder that step (3) obtains is stirred with noncrystalline carbon precursor, before the noncrystalline charcoal
Drive body is asphalt, and the average grain diameter of the asphalt is 5 μm, the weight of the asphalt and high-purity natural graphite
Than for 5:100, in 1100 DEG C of progress charing process in inert gas, the inert gas is the nitrogen that purity is 99.999%
Gas, the flow velocity of the nitrogen are 0.1m3/ h obtains high-density lithium ion battery negative electrode material.
Embodiment 2
The preparation method of high-density lithium ion battery negative electrode material, comprising the following steps:
(1) it is 100:10 high-purity natural graphite and carbonaceous mesophase spherules by weight ratio, is sufficiently mixed, obtains mixture；Institute
The high-purity natural graphite stated is ash content less than 0.05%, and iron content is less than the spherical natural graphite of 100ppm, the high-purity natural
The D50 value of graphite is 8 μm, and the D50 value of the carbonaceous mesophase spherules agent is 15 μm；
(2) mixture that step (1) obtains is carried out compression molding to handle to obtain block, the pressure of the compression molding is
100MPa, time 0.5h；
(3) block for obtaining step (2) carries out disaggregation processing, obtains modified powder, the method for the disaggregation processing is
It is mechanically pulverized, it is circular configuration that the cutter head used, which is mechanically pulverized, and the D50 value of the modified powder is 8 μm；
(4) modified powder that step (3) obtains is stirred with noncrystalline carbon precursor, before the noncrystalline charcoal
Drive body is asphalt, and the average grain diameter of the asphalt is 1 μm, the weight of the asphalt and high-purity natural graphite
Than for 5:100, in 1100 DEG C of progress charing process in inert gas, the inert gas is the nitrogen that purity is 99.990%
Gas, the flow velocity of the nitrogen are 0.1m3/ h obtains high-density lithium ion battery negative electrode material.
Embodiment 3
The preparation method of high-density lithium ion battery negative electrode material, comprising the following steps:
(1) it is 100:10 high-purity natural graphite and carbonaceous mesophase spherules by weight ratio, is sufficiently mixed, obtains mixture；Institute
The high-purity natural graphite stated is ash content less than 0.05%, and iron content is less than the spherical natural graphite of 100ppm, the high-purity natural
The D50 value of graphite is 15 μm, and the D50 value of the carbonaceous mesophase spherules agent is 8 μm；
(2) mixture that step (1) obtains is carried out compression molding to handle to obtain block, the pressure of the compression molding is
80MPa, time 1h；
(3) block for obtaining step (2) carries out disaggregation processing, obtains modified powder, the method for the disaggregation processing is
It is mechanically pulverized, it is circular configuration that the cutter head used, which is mechanically pulverized, and the D50 value of the modified powder is 25 μm；
(4) modified powder that step (3) obtains is stirred with noncrystalline carbon precursor, before the noncrystalline charcoal
Drive body is asphalt, and the average grain diameter of the asphalt is 3 μm, the weight of the asphalt and high-purity natural graphite
Than for 5:100, in 1100 DEG C of progress charing process in inert gas, the inert gas is the nitrogen that purity is 99.999%
Gas, the flow velocity of the nitrogen are 2m3/ h obtains high-density lithium ion battery negative electrode material.
Embodiment 4
The preparation method of high-density lithium ion battery negative electrode material, comprising the following steps:
(1) it is 10:100 high-purity natural graphite and carbonaceous mesophase spherules by weight ratio, is sufficiently mixed, obtains mixture；Institute
The high-purity natural graphite stated is ash content less than 0.05%, and iron content is less than the spherical natural graphite of 100ppm, the high-purity natural
The D50 value of graphite is 15 μm, and the D50 value of the carbonaceous mesophase spherules agent is 8 μm；
(2) mixture that step (1) obtains is carried out compression molding to handle to obtain block, the pressure of the compression molding is
100MPa, time 1h；
(3) block for obtaining step (2) carries out disaggregation processing, obtains modified powder, the method for the disaggregation processing is
It is mechanically pulverized, it is circular configuration that the cutter head used, which is mechanically pulverized, and the D50 value of the modified powder is 8 μm；
(4) modified powder that step (3) obtains is stirred with noncrystalline carbon precursor, before the noncrystalline charcoal
Drive body is asphalt, and the average grain diameter of the asphalt is 3 μm, the weight of the asphalt and high-purity natural graphite
Than for 5:10, in 1100 DEG C of progress charing process in inert gas, the inert gas is the nitrogen that purity is 99.999%,
The flow velocity of the nitrogen is 0.5m3/ h obtains high-density lithium ion battery negative electrode material.
Embodiment 5
The preparation method of high-density lithium ion battery negative electrode material, comprising the following steps:
(1) high-purity natural graphite and carbonaceous mesophase spherules for being 55:55 by weight ratio, is sufficiently mixed, obtains mixture；Institute
The high-purity natural graphite stated is ash content less than 0.05%, and iron content is less than the spherical natural graphite of 100ppm, the high-purity natural
The D50 value of graphite is 15 μm, and the D50 value of the carbonaceous mesophase spherules agent is 8 μm；
(2) mixture that step (1) obtains is carried out compression molding to handle to obtain block, the pressure of the compression molding is
100MPa, time 1h；
(3) block for obtaining step (2) carries out disaggregation processing, obtains modified powder, the method for the disaggregation processing is
It is mechanically pulverized, it is circular configuration that the cutter head used, which is mechanically pulverized, and the D50 value of the modified powder is 8 μm；
(4) modified powder that step (3) obtains is stirred with noncrystalline carbon precursor, before the noncrystalline charcoal
Drive body is asphalt, and the average grain diameter of the asphalt is 3 μm, the weight of the asphalt and high-purity natural graphite
Than for 5:55, in 1100 DEG C of progress charing process in inert gas, the inert gas is the nitrogen that purity is 99.995%,
The flow velocity of the nitrogen is 0.5m3/ h obtains high-density lithium ion battery negative electrode material.
Embodiment 6
The preparation method of high-density lithium ion battery negative electrode material, comprising the following steps:
(1) high-purity natural graphite and carbonaceous mesophase spherules for being 100:10 by weight ratio, is sufficiently mixed, obtains mixture；
The high-purity natural graphite is ash content less than 0.05%, and iron content is less than the spherical natural graphite of 100ppm, high-purity day
The D50 value of right graphite is 15 μm, and the D50 value of the carbonaceous mesophase spherules agent is 8 μm；
(2) mixture that step (1) obtains is carried out compression molding to handle to obtain block, the pressure of the compression molding is
100MPa, time 1h；
(3) block for obtaining step (2) carries out disaggregation processing, obtains modified powder, the method for the disaggregation processing is
It is mechanically pulverized, it is circular configuration that the cutter head used, which is mechanically pulverized, and the D50 value of the modified powder is 8 μm；
(4) modified powder that step (3) obtains is stirred with noncrystalline carbon precursor, before the noncrystalline charcoal
Drive body is asphalt, and the average grain diameter of the asphalt is 3 μm, the weight of the asphalt and high-purity natural graphite
Than for 8:100, in 1100 DEG C of progress charing process in inert gas, the inert gas is the nitrogen that purity is 99.995%
Gas, the flow velocity of the nitrogen are 0.5m3/ h obtains high-density lithium ion battery negative electrode material.
Embodiment 7
The preparation method of high-density lithium ion battery negative electrode material, comprising the following steps:
(1) high-purity natural graphite and carbonaceous mesophase spherules for being 10:100 by weight ratio, is sufficiently mixed, obtains mixture；
The high-purity natural graphite is ash content less than 0.05%, and iron content is less than the spherical natural graphite of 100ppm, high-purity day
The D50 value of right graphite is 20 μm, and the D50 value of the carbonaceous mesophase spherules agent is 25 μm；
(2) mixture that step (1) obtains is carried out compression molding to handle to obtain block, the pressure of the compression molding is
120MPa, time 0.5h；
(3) block for obtaining step (2) carries out disaggregation processing, obtains modified powder, the method for the disaggregation processing is
It is mechanically pulverized, it is stick latch structure that the cutter head used, which is mechanically pulverized, and the D50 value of the modified powder is 8 μm；
(4) modified powder that step (3) obtains is stirred with noncrystalline carbon precursor, before the noncrystalline charcoal
Body is driven as the mixture of asphalt and coal tar pitch, the weight ratio of the asphalt and coal tar pitch is 1:1, the asphalt
Average grain diameter with coal tar pitch mixture is 3 μm, the mixture and high-purity natural graphite of the asphalt and coal tar pitch
Weight ratio is 5:10, and in 1200 DEG C of progress charing process in inert gas, the inert gas is that purity is 99.995%
Nitrogen, the flow velocity of the nitrogen are 0.5m3/ h obtains high-density lithium ion battery negative electrode material.
Embodiment 8
The preparation method of high-density lithium ion battery negative electrode material, comprising the following steps:
(1) high-purity natural graphite and carbonaceous mesophase spherules for being 10:100 by weight ratio, is sufficiently mixed, obtains mixture；
The high-purity natural graphite is ash content less than 0.05%, and iron content is less than the spherical natural graphite of 100ppm, high-purity day
The D50 value of right graphite is 6 μm, and the D50 value of the carbonaceous mesophase spherules agent is 8 μm；
(2) mixture that step (1) obtains is carried out compression molding to handle to obtain block, the pressure of the compression molding is
50MPa, time 3h；
(3) block for obtaining step (2) carries out disaggregation processing, obtains modified powder, the method for the disaggregation processing is
It is mechanically pulverized, it is stick latch structure that the cutter head used, which is mechanically pulverized, and the D50 value of the modified powder is 8 μm；
(4) modified powder that step (3) obtains is stirred with noncrystalline carbon precursor, before the noncrystalline charcoal
Drive body is coal tar pitch, and the average grain diameter of the coal tar pitch is 3 μm, and the weight ratio of the asphalt and high-purity natural graphite is
5:10, in 1000 DEG C of progress charing process in inert gas, the inert gas is the nitrogen that purity is 99.995%, described
The flow velocity of nitrogen is 0.5m3/ h obtains high-density lithium ion battery negative electrode material.
Comparative example 1
The preparation method of lithium ion battery negative material, comprising the following steps:
(1) high-purity natural graphite and carbonaceous mesophase spherules for being 100:10 by weight ratio, is sufficiently mixed, obtains mixture；
The D50 value of the high-purity natural graphite is 15 μm, and the D50 value of the carbonaceous mesophase spherules agent is 8 μm；
(2) step (1) is obtained mixture to stir with noncrystalline carbon precursor, the noncrystalline carbon precursor
For asphalt, the weight ratio of the asphalt and high-purity natural graphite is 5:10, in inert gas 1100 DEG C into
Row charing process, the inert gas are the nitrogen that purity is 99.999%, and the flow velocity of the nitrogen is 0.5m3/ h, obtains lithium
Ion battery cathode material.
Test example
Study 1-6 of the embodiment of the present invention using the soft-package battery of model 423282 and lithium that comparative example 1 obtains from
The chemical property of sub- cell negative electrode material.
For cathode using deionized water as solvent, the formula of pole piece presses active material: CMC:SP:SBR=96.3:1.2:
The slurry that 1.0:1.5 is configured to 43% is coated on copper foil, and 1.65g/cc is arrived in cold pressing.
Anode uses NMP as solvent, by LiCoO2: it is 65% that SP:PVDF=95:2.5:2.5, which is configured to solid content,
Slurry is uniformly coated on aluminium foil.
The LiPF that electrolyte in soft-package battery is 1mol/L6, solvent using volume ratio 1:1:1 EC, DEC and EMC
Mixed solvent.Electro-chemical test carries out charge and discharge using 0.5C/0.5C, and charge and discharge blanking voltage is 3.0V/4.2V, wherein recycling
The EOT end of test recycles for 300, and 45 degree of test temperature.
Embodiment 1-6 and comparative example 1 are tested using above-mentioned electrochemical method, result is as shown in table 1.
The electrochemical property test result of 1 lithium ion battery negative material of table
From the results shown in Table 1, the embodiment of the present invention 1,2 is natural graphite and the centre of different-grain diameter collocation respectively
Phase carbosphere die mould scheme, first charge discharge efficiency has greatly improved compared with comparative example 1, and natural graphite inside lacks after illustrating die mould
Falling into reduces, and reduces to the consumption of electrolyte, and tap density increases after die mould, reduces to bonding agent demand, promotes negative electrode material
Active matter quality, increase energy density.Embodiment 3 is the processing scheme under different pressures, with 1 first charge discharge efficiency of comparative example
Also there is promotion, the circulation conservation rate of battery also has increase.Embodiment 4,5 is respectively the processing scheme of different proportion, with comparative example 1
All have greatly improved compared in efficiency, further having proved the method for the present invention may be implemented to improve natural graphite electrochemistry
The purpose of energy, can be improved the first charge discharge efficiency and capacity retention ratio of graphite material through the invention.
Fig. 1 is the loop test curve of the soft-package battery of embodiment 1 and comparative example 1.The raising of cycle performance in Fig. 1
The internal voids for further illustrating material after die mould reduce the cyclical stability that can promote material.Through the foregoing embodiment
There is very big advantage on data analytical proof method cycle performance of the invention.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of preparation method of high-density lithium ion battery negative electrode material, which comprises the following steps:
(1) it is the high-purity natural graphite of 10:1~100 and carbonaceous mesophase spherules by weight ratio, is sufficiently mixed, obtains mixture；It is described
High-purity natural graphite be ash content less than 0.05%, iron content be less than 100ppm spherical natural graphite；
(2) mixture that step (1) obtains compression molding is carried out to handle to obtain block；
(3) block for obtaining step (2) carries out disaggregation processing, obtains modified powder；
(4) modified powder that step (3) obtains is stirred with noncrystalline carbon precursor, the noncrystalline carbon precursor
Weight ratio with high-purity natural graphite is that 0.5~5:10 is obtained in 600~1500 DEG C of progress charing process in inert gas
To high-density lithium ion battery negative electrode material.
2. the preparation method of high-density lithium ion battery negative electrode material according to claim 1, which is characterized in that step
(1) in, the D50 value of the high-purity natural graphite is 6~20 μm, and the D50 value of the carbonaceous mesophase spherules is 8~25 μm.
3. the preparation method of high-density lithium ion battery negative electrode material according to claim 1, which is characterized in that step
(2) in, the pressure of the compression molding is 50~120MPa, and the time is 0.5~3h.
4. the preparation method of high-density lithium ion battery negative electrode material according to claim 3, which is characterized in that step
(2) in, the pressure of the compression molding is 80~100MPa, and the time is 0.5~1h.
5. the preparation method of high-density lithium ion battery negative electrode material according to claim 1, which is characterized in that step
(3) in, the D50 value of the modified powder is 8~25 μm.
6. the preparation method of high-density lithium ion battery negative electrode material according to claim 1, which is characterized in that step
(4) in, the noncrystalline carbon precursor is coal tar pitch and/or asphalt.
7. the preparation method of high-density lithium ion battery negative electrode material according to claim 6, which is characterized in that step
(4) in, the noncrystalline carbon precursor is asphalt.
8. the preparation method of high-density lithium ion battery negative electrode material according to claim 1, which is characterized in that step
(4) in, the average grain diameter of the noncrystalline carbon precursor is 1~5 μm.
9. the preparation method of high-density lithium ion battery negative electrode material according to claim 1, which is characterized in that step
(4) in, the temperature of the charing process is 1000~1200 DEG C, and the inert gas is nitrogen, and the purity of the nitrogen is
99.99% or more, the flow of the nitrogen is 0.1~2.0m3/h。
10. being obtained using the preparation method of any high-density lithium ion battery negative electrode material of claim 1-9 highly dense
Spend lithium ion battery negative material.
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