CN110203923A - A kind of lithium ion battery negative material and preparation method thereof - Google Patents
A kind of lithium ion battery negative material and preparation method thereof Download PDFInfo
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 74
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 239000000463 material Substances 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 90
- 229910021383 artificial graphite Inorganic materials 0.000 claims abstract description 89
- 229910052742 iron Inorganic materials 0.000 claims abstract description 45
- 238000009826 distribution Methods 0.000 claims abstract description 23
- 102220043159 rs587780996 Human genes 0.000 claims abstract description 16
- 102220042174 rs141655687 Human genes 0.000 claims abstract description 10
- 102220076495 rs200649587 Human genes 0.000 claims abstract description 10
- 238000007873 sieving Methods 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims description 58
- 230000004907 flux Effects 0.000 claims description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 16
- 239000010439 graphite Substances 0.000 claims description 13
- 229910002804 graphite Inorganic materials 0.000 claims description 10
- 235000013312 flour Nutrition 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 3
- 239000002969 artificial stone Substances 0.000 claims 1
- 230000002441 reversible effect Effects 0.000 description 13
- 239000002994 raw material Substances 0.000 description 10
- 230000006872 improvement Effects 0.000 description 8
- 239000002245 particle Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 239000011331 needle coke Substances 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 238000005087 graphitization Methods 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000002006 petroleum coke Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 241000209456 Plumbago Species 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000010406 cathode material Substances 0.000 description 3
- 235000013339 cereals Nutrition 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000001354 calcination Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910021382 natural graphite Inorganic materials 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910032387 LiCoO2 Inorganic materials 0.000 description 1
- 229910052493 LiFePO4 Inorganic materials 0.000 description 1
- 229910003005 LiNiO2 Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000011294 coal tar pitch Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 229910052571 earthenware Inorganic materials 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 229910002096 lithium permanganate Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000005486 organic electrolyte Substances 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 239000006253 pitch coke Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
- C01B32/21—After-treatment
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
- C01B32/21—After-treatment
- C01B32/215—Purification; Recovery or purification of graphite formed in iron making, e.g. kish graphite
-
- 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
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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
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
-
- 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)
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
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Abstract
The invention discloses a kind of lithium ion battery negative material, by artificial graphite electrode it is broken through except iron, crushing, spheroidization, classification, except magnetic and sieving after be made, size distribution are as follows: D10=5-10 μm, D50=10-30 μm, D90=30-50 μm.Correspondingly, the present invention also provides a kind of lithium ion battery negative materials and preparation method thereof.Preparation method of the invention is simple, low in cost.
Description
Technical field
The present invention relates to technical field of lithium ion battery negative more particularly to a kind of lithium ion battery negative material and
Preparation method.
Background technique
The energy is a big key factor of earth development, and material related with the energy is always the master of human development progress
Topic.Nowadays, petroleum-based energy i.e. will be exhausted, and as the electrochmical power source that can convert chemical energy to electric energy, then it can replace
The energy of the petroleum as human development progress.Nineteen ninety, Sony Corporation of Japan use graphite-structure carbon material as lithium ion battery
After cathode, lithium ion battery initially enters commercialization.The specific capacity of lithium ion battery is big, has extended cycle life, while can be defeated
Voltage out is high, self-discharge rate is low, temperature limit is wide, the advantages that good cycling stability, having a safety feature, is environmentally protective,
To be widely used in the electronic products such as mobile phone, notebook, video camera.Since the 21th century, lithium ion battery is applicable in model
It encloses more and more extensively, such as electric car, aerospace, military installations, people are also higher and higher to its performance and price request.
The chief component of lithium ion battery includes positive and negative anodes intercalation materials of li ions, organic electrolyte and battery diaphragm etc..
Wherein, positive and negative pole material not only plays key effect to performance of lithium ion battery, and its production cost accounts for the one of entire battery
Half or more, therefore, primary study content of the exploitation and Study on Preparation of positive and negative pole material as people.
By constantly developmental research, people have launched LiCoO2、LiMnO4、LiNiO2、LiFePO4Deng positive material
Material, and negative electrode material can further be divided into artificial graphite and natural graphite at present based on graphite carbon material.China is natural
It is graphite rich reserves, cheap, be conducive to the cost advantage for playing our graphite cathode materials, but natural graphite is in removal lithium embedded
It is easy to cause the total insertion of solvent in the process, destroys the interlayer structure of graphite, leads to poor circulation, application range is relatively narrow.People
Making graphite then has many advantages, such as high rate capability, high circulation stability and electrolyte good compatibility, but there is also specific surfaces simultaneously
The problems such as product is big, and first charge discharge efficiency is low.
Currently, each big owners of private enterprises will prepare high performance lithium-ion electric as raw material using petroleum coke, needle coke etc.
Pond artificial plumbago negative pole material.Also have a small amount of producer using graphite crucible waste material as raw material come prepare the lithium of superior performance from
Sub- battery artificial plumbago negative pole material.But the needle coke prices of raw materials are high, petroleum coke, needle coke manufacturing procedure are long；Graphite earthenware
Crucible waste material structural instability, impurity is more, degree of graphitization is not high.
Artificial graphite electrode refers to that coal tar pitch is adhesive using petroleum coke, pitch coke as aggregate, by raw material calcining, breaks
Comminution powder, ingredient, kneading, molding, roasting, dipping, graphitization and machining and a kind of manufactured high temperature resistant graphite is conductive
Material.
Summary of the invention
Technical problem to be solved by the present invention lies in provide a kind of lithium ion battery negative material, using artificial graphite
Electrode flour is broken as raw material, at low cost.
The present invention also technical problems to be solved are, provide a kind of preparation method of lithium ion battery negative material, adopt
Use artificial graphite electrode broken as raw material, preparation method is simple, low in cost.
In order to solve the above-mentioned technical problems, the present invention provides a kind of lithium ion battery negative materials, by artificial graphite electricity
It is extremely broken to be removed iron, crushing, spheroidization, classification, remove magnetic and be made after being sieved, size distribution are as follows: D10=5-10 μm, D50=
10-30 μm, D90=30-50 μm.
As an improvement of the above scheme, size distribution are as follows: D10=6-10 μm, D50=15-20 μm, D90=30-36 μ
m。
As an improvement of the above scheme, tap density 0.8-0.9g/cm3, specific surface area is 6 ± 0.5m2/g。
As an improvement of the above scheme, iron-content is less than 100ppm.
Correspondingly, the present invention also provides a kind of preparation method of lithium ion battery negative material as described above, packets
Include following steps:
S1, it is added to artificial graphite electrode is broken in iron remover, carries out except iron；
S2, by except the artificial graphite electrode flour after iron it is broken, obtain artificial graphite electrode powder；
S3, by artificial graphite electrode powder spheroidization, classification, obtain artificial graphite electrode powder；
S4, artificial graphite electrode powder is added to except in chinaware, carrying out except magnetic, so that artificial graphite electrode powder contains
Iron is less than 100ppm；
S5,300 mesh screens will be crossed except the artificial graphite electrode powder after magnetic, extracting screen underflow obtains negative electrode of lithium ion battery
Material.
As an improvement of the above scheme, the size distribution of the artificial graphite electrode powder in step (S2) are as follows: D50=11-16 μ
m。
As an improvement of the above scheme, it in step (1), is added to artificial graphite electrode is broken in permanent-magnetic iron expeller, wherein
The magnetic flux of permanent-magnetic iron expeller is greater than 8000Gs, and the broken speed that adds of artificial graphite electrode is 10-30kg/min.
As an improvement of the above scheme, in step (1), the magnetic flux of permanent-magnetic iron expeller is 8000-13000Gs.
As an improvement of the above scheme, in step (4), artificial graphite electrode powder is added to electromagnetism and is removed in chinaware,
In, electromagnetism is greater than 30000Gs except the magnetic flux of chinaware, and the speed that adds of artificial graphite electrode powder is 5-10kg/min.
As an improvement of the above scheme, in step (4), electromagnetism is 30000-32000Gs except the magnetic flux of chinaware.
The invention has the following beneficial effects:
A kind of lithium ion battery negative material provided by the invention, it is broken through removing iron, crushing, spherical shape by artificial graphite electrode
Change, classification, remove obtained, size distribution are as follows: D10=5-10 μm, D50=10-30 μm, D90=30-50 μm after magnetic and sieving.
The present invention uses the broken raw material as lithium ion battery negative material of artificial graphite electrode, and lithium-ion electric is effectively reduced
The cost in pond.In addition, the present invention is classified the granularity of lithium ion battery negative material, so that its size distribution is certain
Range, with improve the reversible specific capacity for the first time of lithium ion battery, first charge-discharge efficiency and reversible capacity after circulation 300 weeks,
Compacted density.
The electrochemical performance of lithium ion battery negative material of the invention, using ion cathode material lithium system of the present invention
Standby resulting lithium ion battery, reversible specific capacity reaches 352mAh/g for the first time, and first charge-discharge efficiency is recycled up to 91.5% or more
300 weeks reversible capacities are still able to maintain 280mAh/g, and compacted density reaches 1.60-1.65g/cm3。
In addition, the preparation method of lithium ion battery negative material provided by the invention, directly by negative electrode of lithium ion battery material
Material carries out except iron, crushing, spheroidization, classification, removes magnetic and sieving, does not need the techniques such as raw material calcining, graphitization, present invention preparation
Method is simple, and ingredient is cheap, environmental protection.
Further, the present invention is used as raw material using artificial graphite electrode is broken, and impurity is few, performance is stable.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention will be made below further detailed
Description.
A kind of lithium ion battery negative material provided by the invention, it is broken through removing iron, crushing, spherical shape by artificial graphite electrode
Change, classification, remove obtained, size distribution are as follows: D10=5-10 μm, D50=10-30 μm, D90=30-50 μm after magnetic and sieving.
The broken non-reusable object to be generated in artificial graphite electrode process of artificial graphite electrode, degree of graphitization,
Reversible specific capacity is higher than graphite crucible waste material, and structure is also more stable.Wherein, artificial graphite electrode is broken belongs to carbon industry.
Relative to directly the aggregates such as petroleum coke, needle coke being crushed, after shaping and pitch carries out kneading, molding, carbonization, stone
The processing such as inkization prepare the artificial plumbago negative pole material to be formed, and the present invention prepares negative electrode material using artificial graphite electrode is broken,
It not only can be salvaged, reduce cost, discharge, the protection environment of pollutant can also be reduced, there is preferable social benefit,
And the win-win of carbon industry and lithium ion battery industry can be promoted.The needle coke prices of raw materials of prior art buying are universal
15k yuan/ton or more, and what the present invention was purchased is waste material in carbon industry artificial graphite electrode production process, price is universal
10k yuan/ton or less.
It should be noted that in the preparation process of lithium ion battery negative material of the invention, artificial graphite electrode powder
The size distribution of material, tap density size, specific surface area size all can be to the knots of obtained lithium ion battery negative material
Structure, pattern, powder compacted density produce a very large impact, to influence its first charge-discharge efficiency, compacted density.
Wherein, the size distribution of lithium ion battery negative material of the present invention are as follows: particle of the diameter less than 5-10 microns accounts for
10%, particle of the diameter less than 10-30 microns accounts for 50%, and diameter accounts for 90% less than 30-50 microns.
Preferably, the size distribution of lithium ion battery negative material are as follows: D10=6-10 μm, D50=15-20 μm, D90=
30-36μm。
If the size distribution of lithium ion battery negative material exceeds above range, that is, the partial size of 10% particle is accounted for beyond 10
Micron accounts for the partial size of 50% particle beyond 30 microns, account for the partial size of 90% particle beyond 50 microns, then lithium ion battery
Reversible specific capacity, first charge-discharge efficiency, compacted density can reduce for the first time, and reversible capacity of the circulation after 300 weeks can also decline.
Preferably, the tap density of lithium ion battery negative material is 0.8-0.9g/cm3, specific surface area is 6 ± 0.5m2/
g.The tap density and specific surface area of lithium ion battery negative material of the present invention and the size distribution of lithium ion battery negative material
With certain relationship.If tap density and specific surface area exceed above range, the reversible for the first time of lithium ion battery can be also reduced
Specific capacity, first charge-discharge efficiency and compacted density, reversible capacity of the circulation after 300 weeks can also decline.
The iron-content of lithium ion battery negative material will affect the cycle-index of lithium ion battery.
Preferably, the iron-content of lithium ion battery negative material is less than 100ppm.If the iron-content of lithium ion battery is greater than
100ppm can then reduce the recyclable number of lithium ion battery.More preferably, the iron-content of lithium ion battery negative material is less than
80ppm。
Correspondingly, the present invention also provides a kind of preparation methods of lithium ion battery negative material described above, including with
Lower step:
S1, it is added to artificial graphite electrode is broken in iron remover, carries out except iron；
Since artificial graphite electrode can mix some iron during preparation, if in lithium ion battery negative material
Iron content is excessive, then will affect the performance of lithium ion battery.
Specifically, being added to artificial graphite electrode is broken in permanent-magnetic iron expeller, wherein the magnetic flux of permanent-magnetic iron expeller is greater than
8000Gs。
Preferably, the magnetic flux of permanent-magnetic iron expeller is 8000-13000Gs.If the magnetic flux of permanent-magnetic iron expeller is less than
8000Gs, if the magnetic flux of permanent-magnetic iron expeller is greater than 13000Gs, will increase equipment cost then except preset value is not achieved in iron.
Wherein, the broken speed that adds being added in iron remover of artificial graphite electrode also plays important work to de-ferrous effect
With.Preferably, it is 10-30kg/min that artificial graphite electrode was broken, which adds speed,.
S2, by except the artificial graphite electrode flour after iron it is broken, obtain artificial graphite electrode powder；
Specifically, it is using pulverizer that the artificial graphite electrode flour after removing iron is broken, obtain artificial graphite electrode powder.This hair
Bright pulverizer be airslide disintegrating mill or impact grinder, but not limited to this.
It needs to carry out spheroidization and classification since artificial graphite electrode powder of the invention is subsequent, in order to realize that the present invention is artificial
The size distribution requirements of graphite electrode powder, the size distribution of smashed artificial graphite electrode powder are as follows: D50=8-20 μm.If
The average grain diameter of artificial graphite electrode powder exceeds above range, then will affect the size distribution of lithium ion battery negative material, drops
Reversible capacity of the reversible specific capacity for the first time, first charge-discharge efficiency and circulation of low lithium ion battery after 300 weeks.
Preferably, the average particle size distribution of smashed artificial graphite electrode powder are as follows: D50=11-16 μm.
S3, by artificial graphite electrode powder spheroidization, classification, obtain artificial graphite electrode powder；
Specifically, artificial graphite electrode powder spheroidization, classification are obtained artificial graphite electrode powder using trimmer.
S4, artificial graphite electrode powder is added to except in chinaware, carrying out except magnetic, so that artificial graphite electrode powder contains
Iron is less than 100ppm；
In order to be further reduced the iron content of lithium ion battery negative material, the recyclable number of lithium ion battery is improved,
The present invention is by carrying out except magnetic artificial graphite electrode powder, so that the iron-content of artificial graphite electrode powder is less than 100ppm.
Preferably, the iron-content of artificial graphite electrode powder is less than 80ppm.
Specifically, by the broken electromagnetism that is added to of artificial graphite electrode except in chinaware, wherein electromagnetism is greater than except the magnetic flux of chinaware
30000Gs。
Preferably, it is 30000-32000Gs that electromagnetism, which removes the magnetic flux of chinaware,.If electromagnetism is less than except the magnetic flux of chinaware
30000Gs, if electromagnetism is greater than 32000Gs except the magnetic flux of chinaware, will increase energy consumption then except preset value is not achieved in iron.
Wherein, artificial graphite electrode powder is added to except the speed that adds in chinaware also plays important work to de-ferrous effect
With.Preferably, the speed that adds of artificial graphite electrode powder is 5-10kg/min.
S5,300 mesh screens will be crossed except the artificial graphite electrode powder after iron, extracting screen underflow obtains negative electrode of lithium ion battery
Material.
The electrochemical performance of lithium ion battery negative material of the invention, reversible specific capacity reaches 352mAh/ for the first time
G, first charge-discharge efficiency is up to 91.5% or more, and 300 weeks reversible capacities of circulation are still able to maintain 280mAh/g, and compacted density reaches
1.60-1.65g/cm3。
Below will with specific embodiment come the present invention is further explained
Embodiment 1
A kind of preparation method of lithium ion battery negative material, comprising the following steps:
S1, by the broken addition hopper of artificial graphite electrode, put into iron remover by hopper, the magnetic flux of iron remover is
8000Gs, charging rate 10-30kg/min are carried out except iron；
S2, by except the artificial graphite electrode flour after iron it is broken, obtain artificial graphite electrode powder, the grain of artificial graphite electrode powder
Degree distribution are as follows: D50=11 μm；
S3, by artificial graphite electrode powder spheroidization, classification, obtain artificial graphite electrode powder, artificial graphite electrode powder
Size distribution are as follows: D10=6 μm, D50=15 μm, D90=30 μm, the tap density of artificial graphite electrode powder are 0.8g/
cm3, specific surface area 6.5m2/g；
S4, artificial graphite electrode powder is added to except in chinaware, carrying out except magnetic, so that artificial graphite electrode powder contains
Iron is less than 100ppm, except the magnetic flux of chinaware is 30000Gs, charging rate 5-10kg/min；
S5,300 mesh screens will be crossed except the artificial graphite electrode powder after magnetic, extracting screen underflow obtains negative electrode of lithium ion battery
Material.
Embodiment 2
A kind of preparation method of lithium ion battery negative material, comprising the following steps:
S1, by the broken addition hopper of artificial graphite electrode, put into iron remover by hopper, the magnetic flux of iron remover is
10000Gs, charging rate 10-30kg/min are carried out except iron；
S2, by except the artificial graphite electrode flour after iron it is broken, obtain artificial graphite electrode powder, the grain of artificial graphite electrode powder
Degree distribution are as follows: D50=15 μm；
S3, by artificial graphite electrode powder spheroidization, classification, obtain artificial graphite electrode powder, artificial graphite electrode powder
Size distribution are as follows: D10=8 μm, D50=18 μm, D90=33 μm, the tap density of artificial graphite electrode powder are 0.85g/
cm3, specific surface area 6.0m2/g；
S4, artificial graphite electrode powder is added to except in chinaware, carrying out except magnetic, so that artificial graphite electrode powder contains
Iron is less than 80ppm, except the magnetic flux of chinaware is 32000Gs, charging rate 5-10kg/min；
S5,300 mesh screens will be crossed except the artificial graphite electrode powder after magnetic, extracting screen underflow obtains negative electrode of lithium ion battery
Material.
Identical lithium ion battery is made to the ion cathode material lithium of embodiment 1 and embodiment 2, wherein lithium-ion electric
Pond performance is as follows:
As can be seen from the above table, the lithium ion battery negative material obtained by the present invention is applied to have in lithium ion battery
Good chemical property.
Above disclosed is only a preferred embodiment of the present invention, cannot limit the power of the present invention with this certainly
Sharp range, therefore equivalent changes made in accordance with the claims of the present invention, are still within the scope of the present invention.
Claims (10)
1. a kind of lithium ion battery negative material, which is characterized in that remove iron by the broken warp of artificial graphite electrode, crushing, spheroidization, divide
Grade is made, size distribution are as follows: D10=5-10 μm, D50=10-30 μm, D90=30-50 μm after removing magnetic and sieving.
2. lithium ion battery negative material as described in claim 1, which is characterized in that its size distribution are as follows: D10=6-10 μ
M, D50=15-20 μm, D90=30-36 μm.
3. lithium ion battery negative material as claimed in claim 2, which is characterized in that its tap density is 0.8-0.9g/cm3,
Specific surface area is 6 ± 0.5m2/g。
4. lithium ion battery negative material as described in claim 1, which is characterized in that its iron-content is less than 100ppm.
5. a kind of preparation method of lithium ion battery negative material according to any one of claims 1-4, which is characterized in that packet
Include following steps:
S1, it is added to artificial graphite electrode is broken in iron remover, carries out except iron；
S2, by except the artificial graphite electrode flour after iron it is broken, obtain artificial graphite electrode powder；
S3, by artificial graphite electrode powder spheroidization, classification, obtain artificial graphite electrode powder；
S4, artificial graphite electrode powder is added to except in chinaware, carrying out except magnetic, so that the iron-content of artificial graphite electrode powder
Less than 100ppm；
S5,300 mesh screens will be crossed except the artificial graphite electrode powder after magnetic, extracting screen underflow obtains lithium ion battery negative material.
6. the preparation method of lithium ion battery negative material as claimed in claim 5, which is characterized in that the people in step (S2)
Make the size distribution of graphite electrode powder are as follows: D50=11-16 μm.
7. the preparation method of lithium ion battery negative material as claimed in claim 5, which is characterized in that, will in step (S1)
Artificial graphite electrode is broken to be added in permanent-magnetic iron expeller, wherein the magnetic flux of permanent-magnetic iron expeller is greater than 8000Gs, artificial graphite electricity
The extremely broken speed that adds is 10-30kg/min.
8. the preparation method of lithium ion battery negative material as claimed in claim 7, which is characterized in that in step (S1), forever
The magnetic flux of deironing device is 8000-13000Gs.
9. the preparation method of lithium ion battery negative material as claimed in claim 5, which is characterized in that, will in step (S4)
Artificial graphite electrode powder is added to electromagnetism except in chinaware, wherein electromagnetism is greater than 30000Gs, artificial stone except the magnetic flux of chinaware
The speed that adds of electrode ink powder is 5-10kg/min.
10. the preparation method of lithium ion battery negative material as claimed in claim 9, which is characterized in that in step (S4), electricity
Magnetic is 30000-32000Gs except the magnetic flux of chinaware.
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