CN106252662A - A kind of preparation method of low bulk graphite - Google Patents
A kind of preparation method of low bulk graphite Download PDFInfo
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- CN106252662A CN106252662A CN201610743253.7A CN201610743253A CN106252662A CN 106252662 A CN106252662 A CN 106252662A CN 201610743253 A CN201610743253 A CN 201610743253A CN 106252662 A CN106252662 A CN 106252662A
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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
- 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
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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Abstract
The present invention relates to graphite cathode material technical field, the preparation method of a kind of low bulk graphite, it is characterised in that comprise the steps: that (1), crystalline flake graphite raw material carry out pulverizing Shape correction and becomes D50 at the particle diameter of 5～10 μm；(2), crystalline flake graphite raw material, easy graphited binding agent and graphitization catalyst are mixed；(3), under inert gas shielding, carry out Low Temperature Heat Treatment 10～20 hours with 300～800 DEG C, be then cooled to room temperature；(4), under inert gas shielding, catalyzed graphitization high-temperature process 24～48 hours are carried out with 2800～3200 DEG C；(5), batch mixing screening, obtain low bulk graphite.The present invention compared with prior art, preparation method simple possible, it is adaptable to industrialized production；The graphite expansion prepared is low, and discharge capacity is big and good cycle, the high comprehensive performance of its button cell made.
Description
Technical field
The present invention relates to graphite cathode material technical field, the preparation method of a kind of low bulk graphite.
Background technology
In recent years, along with the miniaturization of electronic installation, the secondary cell of more capacity is had increasing need for.Attract people's attention especially
Be lithium ion battery, compared with NI-G or Ni-MH battery, use lithium ion battery there is higher energy density.Although at present
Have been directed towards improving battery capacity and carried out widely studied, but, along with the raising to battery performance requirements, need to carry further
High battery capacity.
As cathode material of lithium ion battery, have studied the such as granular material such as metal or graphite at present.With
The increase of battery capacity, it is accordingly required in particular to can be with higher electrode density (such as 1.75g/cm3Or higher than 1.75g/cm3) make
Negative material.
The carbon cathode material of lithium rechargeable battery is presently mainly graphite microparticles.Wherein, native graphite class is natural stone
Ink carries out surface modification after nodularization again, and native graphite has preferable layer structure, has the highest capacitance (＞ 350mAh/
G), but there is structural instability in it, easily causes the common insertion of solvent molecule so that it is synusia comes off in charge and discharge process, causes
Cycle performance of battery is poor, poor stability.Common graphous graphite powder is in irregular shape, big (the usual ＞ 5m of specific surface area2/ g), cause
Materials processing poor performance, efficiency is low first, and ash rate is higher, and is difficult to ensure that batch is stable.Special Delanium-graphitization
MCMB, Stability Analysis of Structures, little (the ＜ 2.0m of specific surface area2/ g), good cycle, safety is good, therefore for a long time one
Straight in occupation of lithium ion carbon cathode material market, but its cost of manufacture is high, and reversible lithium storage capacity is only at about 310mAh/g.
Therefore, for overcoming native graphite and the deficiency of common Delanium each performance, prior art is all to natural stone
Ink or Delanium are modified processing.Chinese patent CN1397598 uses spray granulation, at graphite microparticles Surface coating one
Layer charcoal, obtaining internal is graphite, and outer layer is the carbon coated graphite microparticles of the nucleocapsid structure of charcoal, and modifying agent used is resin；In
State's patent CN1691373, uses covering (Colophonium class) to be modified natural graphite nodule processing, makes native graphite surface obtain
Micro encapsulation ground clad.Japan Patent JP2000003708 mechanically carries out rounding to graphite material, then at weight
Oil, tar or Colophonium impregnate, then separates and wash.Japan Patent JP2000182617 is to use native graphite etc.
With Colophonium or resin or its mixture Co carbonization, this method can reduce graphite material specific surface area, but at covering amount and bag
Cover and be difficult in effect reach preferably to control.
The common ground of these methods above-mentioned is that graphite microparticles all carries out certain shaping, spheroidising, carries out the most again
Surface is modified, the nucleocapsid structure of last thermally treated formation graphite, and internal is nodularization micro crystal graphite, and outside is pyrolytic carbon layer.Core
Shell structure reduces the specific surface area of material, thus reduces irreversible capacity first, plays good effect.But, these change
The defect of property method is fairly obvious.As due to the better crystallinity degree of graphite, aspect orientation prosperity, only allowed lithium ion along the limit of graphite
Boundary embeds and abjection, thus these method of modifying lithium ion the evolving paths are long, are not suitable for large current charge electric discharge；These methods are adopted
Feed particles generally large, anisotropy is obvious, and therefore fast charging and discharging performance is poor；The raw material availability of these methods
Relatively low, general shaping yield only has about 50%；These methods are all to carry out based on Shape correction by raw material, in order to pursue relatively
Good sphericity, treatment process bothers, and processing cost increases.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, reduce further the expansion of lithium secondary battery graphite, from
And improve the cycle performance of material, it is thus provided that a kind of lithium secondary battery graphite with low bulk and preparation method thereof.
For achieving the above object, the preparation method of a kind of low bulk graphite is designed, it is characterised in that comprise the steps:
(1), crystalline flake graphite raw material carry out pulverize Shape correction become D50 at the particle diameter of 5～10 μm；(2), by crystalline flake graphite raw material, Yi Shi
Binding agent and the graphitization catalyst of inkization mix；(3), under inert gas shielding, carry out low with 300～800 DEG C
Warm processes 10～20 hours, is then cooled to room temperature；(4), under inert gas shielding, it is catalyzed with 2800～3200 DEG C
Graphitizable high temperature processes 24～48 hours；(5), batch mixing screening, obtain low bulk graphite；
Described easy to be graphited binding agent be asphalt, coal tar pitch, phenolic resin, epoxy resin, furane resins and
One or more in furfural resin；
Described graphitization catalyst is one or more in the carbide of silicon, ferrum, stannum or boron or oxide；
Consumption is crystalline flake graphite raw materials quality the 10～30% of described easy graphited binding agent；Described graphitization is catalyzed
The consumption of agent is the 1～10% of crystalline flake graphite raw materials quality.
The particle diameter of described asphalt or coal tar pitch is below 5 μm.
Described catalyzed graphitization high-temperature process is carried out in graphitization finishing stove.
Described room temperature is 5～40 DEG C.
The D50 particle diameter of the described low bulk graphite prepared is 10～30 μm；True density >=2.25g/cm3；Ash≤
0.10%；Specific surface area 1.0～2.0m2/g；Discharge capacity >=365mAh/g first；Discharging efficiency >=95% first.
The present invention compared with prior art, preparation method simple possible, it is adaptable to industrialized production；The graphite prepared is swollen
Swollen low, discharge capacity is big and good cycle, the high comprehensive performance of its button cell made, and mainly has the advantage that swollen
Swollen low, expand after circulation in 1000 weeks and can reach less than 6%；Chemical property is good, and discharge capacity is at more than 365mAh/g；Electric discharge
Platform and platform conservation rate are higher；High rate during charging-discharging is preferable；Good cycle, 1000 circulations, capacity holding >=
80%；Safety is preferable, 130 DEG C/60 minutes, the most quick-fried, do not rise；Preferable to electrolyte and other additive adaptability；Product
Matter is stable, almost without difference between batch.
Accompanying drawing explanation
Fig. 1 is the first charge-discharge curve of the graphite of preparation in the embodiment of the present invention 2.
Fig. 2 is the scanning electron microscope (SEM) photograph of the graphite of preparation in the embodiment of the present invention 2.
Detailed description of the invention
In conjunction with embodiment, the present invention is further described.
Raw material in embodiment is conventional commercial product.
Described asphalt is the MQ-100 mid temperature pitch that Dalian bright strengthening work Materials Co., Ltd produces；
Described coal tar pitch is the mid temperature pitch that Henan Bo Hai Chemical Co., Ltd. produces；
Described phenolic resin is 2130 phenolic resin that Wuxi City A Erzi Chemical Co., Ltd. produces；
Described epoxy resin is 128 epoxy resin that Wuxi City A Erzi Chemical Co., Ltd. produces；
Described furfural resin is the FL type furfural resin that Wuhan Yuancheng Technology Development Co., Ltd. produces；
Described furane resins are the GM type furane resins that Wuxi light Chemical Co., Ltd. produces.
Embodiment 1
Crystalline flake graphite raw material: crystalline flake graphite raw material powder is broken into the powder that D50 is 9.1 μm, 200kg；
Easy graphited binding agent: particle diameter is at 5 μm following asphalt powder, 60kg；
Graphitization catalyst: SiO2, 16kg；
Under stirring, it is alternately added crystalline graphite powder, asphalt powder, SiO2Mix in mixing kettle.At nitrogen
Under the protection of gas, Low Temperature Heat Treatment 16 hours at a temperature of 500 DEG C, afterwards product is cooled to room temperature, then with 2800
DEG C carrying out 36 hours catalyzed graphitization high-temperature process, batch mixing sieves, and prepares the low bulk graphite that grain diameter D50 is 17.8 μm,
Its half-cell capacity 367.5mAh/g, efficiency 95.8% first.
Embodiment 2
Crystalline flake graphite raw material: crystalline flake graphite raw material powder is broken into the powder that D50 is 9.5 μm, 200kg；
Easy graphited binding agent: particle diameter is at 5 μm following asphalt powder, 20kg；
Graphitization catalyst: SiC, 6kg；
Under stirring, it is alternately added in crystalline graphite powder, asphalt powder, SiC to mixing kettle mixing.At nitrogen
Protection under, Low Temperature Heat Treatment 16 hours at a temperature of 500 DEG C, afterwards product is cooled to room temperature, then with 3000 DEG C
Carrying out 48 hours catalyzed graphitization high-temperature process, batch mixing sieves, and preparing grain diameter D50 is 18.3 μm low bulk graphite, and it is half years old
Battery capacity 368.1mAh/g, first efficiency 96.2%.
Embodiment 3
Crystalline flake graphite raw material: crystalline flake graphite raw material powder is broken into the powder that D50 is 5.1 μm, 200kg；
Easy graphited binding agent: particle diameter is at 5 μm following asphalt powder, 40kg；
Graphitization catalyst: SiO2, 10kg；
Under stirring, it is alternately added crystalline graphite powder, asphalt powder, SiO2Mix in mixing kettle.At nitrogen
Under the protection of gas, and Low Temperature Heat Treatment 10 hours at a temperature of 800 DEG C, afterwards product is cooled to room temperature, then with
3200 DEG C carry out 48 hours catalyzed graphitization high-temperature process, and batch mixing sieves, and preparing grain diameter D50 is 17.4 μm low bulk stones
Ink, its half-cell capacity 370.0mAh/g, efficiency 95.6% first.
Embodiment 4
Crystalline flake graphite raw material: crystalline flake graphite raw material powder is broken into the powder that D50 is 8.2 μm, 200kg；
Easy graphited binding agent: particle diameter is at 5 μm following asphalt powder, 50kg；
Graphitization catalyst: Fe2O3, 2kg；
Under stirring, it is alternately added crystalline graphite powder, asphalt powder, Fe2O3Mix in mixing kettle.At nitrogen
Under the protection of gas, and Low Temperature Heat Treatment 20 hours at a temperature of 300 DEG C, afterwards product is cooled to room temperature, then with
2800 DEG C carry out catalyzed graphitization high-temperature process batch mixing screening in 48 hours, and preparing grain diameter D50 is 10.6 μm low bulk graphite,
Its half-cell capacity 371.7mAh/g, efficiency 96.0% first.
Embodiment 5
Crystalline flake graphite raw material: crystalline flake graphite raw material powder is broken into the powder that D50 is 10.1 μm, 200kg；
Easy graphited binding agent: particle diameter is at 5 μm following asphalt powder, 40kg；
Graphitization catalyst: B2O3, 20kg；
Under stirring, it is alternately added crystalline graphite powder, asphalt powder, B2O3Mix in mixing kettle.At nitrogen
Protection under, and Low Temperature Heat Treatment 16 hours at a temperature of 500 DEG C, afterwards product is cooled to room temperature, then with 3200
DEG C carrying out 24 hours catalyzed graphitization high-temperature process, batch mixing sieves, and preparing grain diameter D50 is 30.4 μm low bulk graphite, its
Half-cell capacity 367.4mAh/g, efficiency 95.8% first.
Embodiment 6
Crystalline flake graphite raw material: crystalline flake graphite raw material powder is broken into the powder that D50 is 7.5 μm, 200kg；
Easy graphited binding agent: particle diameter is at 5 μm following asphalt powder, 30kg；
Graphitization catalyst: SiC, 10kg；
Under stirring, it is alternately added in crystalline graphite powder, asphalt powder, SiC to mixing kettle mixing.At nitrogen
Protection under, and Low Temperature Heat Treatment 16 hours at a temperature of 500 DEG C, afterwards product is cooled to room temperature, then with 3200
DEG C carrying out 48 hours catalyzed graphitization high-temperature process, batch mixing sieves, and preparing grain diameter D50 is 16.8 μm low bulk graphite, its
Half-cell capacity 371.1mAh/g, efficiency 95.4% first.
Embodiment 7
Crystalline flake graphite raw material: crystalline flake graphite raw material powder is broken into the powder that D50 is 9.1 μm, 200kg；
Easy graphited binding agent: particle diameter is at the 5 following pitch powders of μm, 20kg；
Graphitization catalyst: SnO2, 6kg；
Under stirring, it is alternately added crystalline graphite powder, coal tar pitch powder, SnO2Mix in mixing kettle.At nitrogen
Protection under, and Low Temperature Heat Treatment 20 hours at a temperature of 500 DEG C, afterwards product is cooled to room temperature, then with 3200
DEG C carrying out 48 hours catalyzed graphitization high-temperature process, batch mixing sieves, and preparing grain diameter D50 is 17.1 μm low bulk graphite, its
Half-cell capacity 368.6mAh/g, efficiency 95.6% first.
Embodiment 8
Crystalline flake graphite raw material: crystalline flake graphite raw material powder is broken into the powder that D50 is 9.5 μm, 200kg；
Easy graphited binding agent: particle diameter is at the 5 following Phenolic resin powder of μm, 50kg；
Graphitization catalyst: SiO2, 16kg；
Under stirring, it is alternately added crystalline graphite powder, Phenolic resin powder, SiO2Mix in mixing kettle.At nitrogen
Under the protection of gas, and Low Temperature Heat Treatment 16 hours at a temperature of 500 DEG C, afterwards product is cooled to room temperature, then with
2800 DEG C carry out 48 hours catalyzed graphitization high-temperature process, and batch mixing sieves, and preparing grain diameter D50 is 17.9 μm low bulk stones
Ink, its half-cell capacity 367.7mAh/g, efficiency 95.3% first.
Embodiment 9
Crystalline flake graphite raw material: crystalline flake graphite raw material powder is broken into the powder that D50 is 9.5 μm, 200kg；
Easy graphited binding agent: particle diameter is at 5 μm following furane resins powder, 50kg；
Graphitization catalyst: SiC, 10kg；
Under stirring, it is alternately added in crystalline graphite powder, furane resins powder, SiC to mixing kettle mixing.At nitrogen
Protection under, and Low Temperature Heat Treatment 16 hours at a temperature of 500 DEG C, afterwards product is cooled to room temperature, then with 3000
DEG C carrying out 32 hours catalyzed graphitization high-temperature process, batch mixing sieves, and preparing grain diameter D50 is 19.3 μm low bulk graphite, its
Half-cell capacity 365.2mAh/g, efficiency 97.0% first.
Embodiment 10
Crystalline flake graphite raw material: crystalline flake graphite raw material powder is broken into the powder that D50 is 8.5 μm, 200kg；
Easy graphited binding agent: particle diameter is at 5 μm following furfural resin powder, 60kg；
Graphitization catalyst: SiC, 10kg；
Under stirring, it is alternately added in crystalline graphite powder, furfural resin powder, SiC to mixing kettle mixing.At nitrogen
Protection under, and Low Temperature Heat Treatment 16 hours at a temperature of 500 DEG C, afterwards product is cooled to room temperature, then at 2800
DEG C carrying out 48 hours catalyzed graphitization high-temperature process, batch mixing sieves, and preparing grain diameter D50 is 18.9 μm low bulk graphite, its
Half-cell capacity 369.1mAh/g, efficiency 94.7% first.
Comparative example 1
Be alternately added under stirring below the spherical graphite powder 200kg and 5 μm that D50 is 9.5 μm asphalt powder 20kg,
Graphitization catalyst SiC 6kg mixes in mixing kettle.Under the protection of nitrogen, and Low Temperature Heat Treatment at a temperature of 500 DEG C
16 hours, afterwards product being cooled to room temperature, carry out 48 hours catalyzed graphitization high-temperature process then at 3000 DEG C, batch mixing sieves
Point, preparing grain diameter D50 is 19.4 μm graphite cathode materials, its half-cell capacity 367.0mAh/g, efficiency 89.7% first.
Comparative example 2
The asphalt powder 20kg of below the crystalline graphite powder 200kg and 5 μm that D50 is 9.5 μm it is alternately added under stirring
Mix in mixing kettle.Under the protection of nitrogen, and Low Temperature Heat Treatment 16 hours at a temperature of 500 DEG C, afterwards reaction is produced
Thing is cooled to room temperature, and batch mixing sieves, and preparing grain diameter D50 is 19.2 μm graphite cathode materials, its half-cell capacity
345.2mAh/g, first efficiency 91.3%.
Comparative example 3
The coal tar pitch powder 20kg being alternately added below the crystalline graphite powder 200kg and 5 μm that D50 is 7.1 μm under stirring arrives
Mixing kettle mixes.Under the protection of nitrogen, and Low Temperature Heat Treatment 16 hours at a temperature of 500 DEG C, afterwards by product
Being cooled to room temperature, carry out 48 hours graphitizable high temperatures then at 3200 DEG C and process, batch mixing sieves, and preparing grain diameter D50 is 25.6 μ
M graphite cathode material, its half-cell capacity 365.3mAh/g, efficiency 87.6% first.
Effect example
(1) graphite cathode material in embodiment 1～8 and comparative example 1～3 is carried out respectively particle diameter, true density,
Compacted density, specific surface area and ash grade test, and the results are shown in Table 2.Test the instrument title used and model is: grain
Footpath, laser fineness gage MS2000；True density, super constant temperature water tank SC-15；Ash, high-temperature electric resistance furnace SX2-2.5-12；Compacting
Density, pole piece milling train JZL235X35-B111；Specific surface area, specific surface area measuring instrument NOVA2000.
(2) use half-cell method of testing to the graphite cathode material in embodiment 1～10 and comparative example 1～3
Carrying out the test of discharge capacity and efficiency first, result is listed in table 2.
Half-cell method of testing is: graphite sample, containing 6～7% N-Methyl pyrrolidone and 2% of Kynoar
Conductive black, by the mass ratio mix homogeneously of 91.6: 6.6: 1.8, is applied on Copper Foil, and it is 110 that the pole piece coated is put into temperature
DEG C vacuum drying oven is vacuum dried 4 hours standby.Simulated battery is assemblied in the German Braun glove box of applying argon gas and carries out,
Electrolyte is 1M LiPF6+EC: DEC: DMC=1: 1: 1 (volume ratio), and metal lithium sheet is to electrode, and electrochemical property test exists
Carrying out on U.S. ArbinBT2000 type cell tester, charging/discharging voltage scope is 0.005 to 1.0V, and charge-discharge velocity is
0.1C。
(3) use full battery testing method that the low bulk graphite of embodiment 2 is tested.Full battery testing method is:
Using the graphite granule of embodiment 2 as negative pole, using cobalt acid lithium as positive pole, 1M LiPF6+EC: DMC: EMC=1: 1: 1 (volume
Than) solution makees electrolyte assembling and help battery, after test 1C charge and discharge 1000 weeks, capability retention is up to more than 80%, shows circulation
Performance is good.
(4) to other relevant item test result of the resultant battery being made up of the low bulk graphite of embodiment 1～10 it is: put
Level platform (3.6V) >=75%, circulates 100 weeks platforms and keeps >=95%；Multiplying power discharging 3C capacity >=50%；1000 circulations are held
Amount keeps >=80%, and circulation expands≤6%；Overcharge, high temperature short circuit, the security performance measuring stability such as thermal shock good, the most on fire,
Not exploding, surface temperature is less than 150 DEG C；Preferable to electrolyte and other additive adaptability, do not analyse lithium；Product is stable, batch
Almost without difference between secondary；Over-charging is preferable；Pole piece processability is good.
The performance such as table 1 below of the low bulk graphite that the employing present invention prepares:
Table 1
The measure of merit such as table 2 below of the prepared low bulk graphite of above-mentioned 10 embodiments and comparative example:
Table 2
From the data of table 2 it can be seen that the discharging efficiency of comparative example 1 is low, only 89.7%, expansion rate 12.72%；
The discharge capacity of comparative example 2 is low, only 345.2mAh/g, expansion rate 8.6%；The expansion rate of comparative example 3
11.66%.Using low bulk graphite prepared by method described in this patent, specific surface area can control 1.0～2.0m2/ g, puts
Capacitance, up to more than 365mAh/g, expands less than 6%；Gram volume and discharging efficiency are higher, reduce the damage of irreversible capacity
Lose, improve energy density, reduce the consumption of positive pole；Specific surface area controls in suitable scope, both can guarantee that particle surface was thin
Hole is flourishing, is conducive to again suppression lithium-ion battery system to produce ballooning, and the security performance of battery is good；Over-charging is preferable；
Preferably voltage platform, discharge voltage quickly can reach plateau, as shown in Figure 1；Good cycle, holds after circulating 1000 times
Amount conservation rate can reach more than 80%；The section of the primary particle of crystalline graphite powder i.e. graphite granule has on the surface of graphite granule
Towards the specific morphology in various directions, see Fig. 2.Thus can improve discharge and recharge acceptance, decrease uptake discharge and recharge further
The expansion of process generation and electrolyte are to the immersion of pole plate.
Claims (5)
1. the preparation method of a low bulk graphite, it is characterised in that comprise the steps: that (1), crystalline flake graphite raw material carry out powder
Broken Shape correction becomes D50 at the particle diameter of 5～10 μm；(2), by crystalline flake graphite raw material, easy graphited binding agent and graphitization
Catalyst mixes；(3), under inert gas shielding, Low Temperature Heat Treatment 10～20 hours are carried out with 300～800 DEG C, then
It is cooled to room temperature；(4), under inert gas shielding, catalyzed graphitization high-temperature process 24～48 is carried out with 2800～3200 DEG C little
Time；(5), batch mixing screening, obtain low bulk graphite；
Described easy to be graphited binding agent is asphalt, coal tar pitch, phenolic resin, epoxy resin, furane resins and furfural
One or more in resin；
Described graphitization catalyst is one or more in the carbide of silicon, ferrum, stannum or boron or oxide；
Consumption is crystalline flake graphite raw materials quality the 10～30% of described easy graphited binding agent；Described graphitization catalyst
Consumption is the 1～10% of crystalline flake graphite raw materials quality.
The preparation method of a kind of low bulk graphite the most as claimed in claim 1, it is characterised in that described asphalt or coal drip
Blue or green particle diameter is below 5 μm.
The preparation method of a kind of low bulk graphite the most as claimed in claim 1, it is characterised in that described catalyzed graphitization is high
Temperature processes and carries out in graphitization finishing stove.
The preparation method of a kind of low bulk graphite the most as claimed in claim 1, it is characterised in that described room temperature is 5～40
℃。
The preparation method of a kind of low bulk graphite the most as claimed in claim 1, it is characterised in that prepared described low bulk stone
The D50 particle diameter of ink is 10～30 μm；True density >=2.25g/cm3；Ash≤0.10%；Specific surface area 1.0～2.0m2/g；First
Discharge capacity >=365mAh/g；Discharging efficiency >=95% first.
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