CN102110805A - Anode material for lithium-ion battery prepared by anthracite and preparation method thereof - Google Patents
Anode material for lithium-ion battery prepared by anthracite and preparation method thereof Download PDFInfo
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- CN102110805A CN102110805A CN2009102277003A CN200910227700A CN102110805A CN 102110805 A CN102110805 A CN 102110805A CN 2009102277003 A CN2009102277003 A CN 2009102277003A CN 200910227700 A CN200910227700 A CN 200910227700A CN 102110805 A CN102110805 A CN 102110805A
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- lithium ion
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- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 239000003830 anthracite Substances 0.000 title claims abstract description 63
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 27
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims description 36
- 239000010405 anode material Substances 0.000 title abstract 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 15
- 238000005087 graphitization Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 38
- 229910002804 graphite Inorganic materials 0.000 claims description 28
- 239000010439 graphite Substances 0.000 claims description 28
- 239000002243 precursor Substances 0.000 claims description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 12
- 238000010409 ironing Methods 0.000 claims description 10
- 239000006148 magnetic separator Substances 0.000 claims description 10
- 239000008187 granular material Substances 0.000 claims description 7
- 238000003763 carbonization Methods 0.000 claims description 6
- 239000003245 coal Substances 0.000 claims description 6
- 238000013467 fragmentation Methods 0.000 claims description 6
- 238000006062 fragmentation reaction Methods 0.000 claims description 6
- 238000001033 granulometry Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 238000010298 pulverizing process Methods 0.000 claims description 6
- 238000002310 reflectometry Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 6
- 239000011775 sodium fluoride Substances 0.000 claims description 6
- 235000013024 sodium fluoride Nutrition 0.000 claims description 6
- 239000004079 vitrinite Substances 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 230000002427 irreversible effect Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000002931 mesocarbon microbead Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 241001269238 Data Species 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005518 electrochemistry Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000007614 solvation Methods 0.000 description 2
- 238000010301 surface-oxidation reaction Methods 0.000 description 2
- 238000005411 Van der Waals force Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 150000001721 carbon Chemical group 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004299 exfoliation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000013081 microcrystal Substances 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000005486 organic electrolyte Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
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- 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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- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses an anode material for a lithium-ion battery prepared by anthracite, the particle size distribution D10 is 6-10 mu m, D50 is 17-20 mu m and D90 is 28-50 mu m, the tap density is 0.8-1.6g/cm3, the carbon content is 93.0-99.99%, and the graphitization degree is 85-97%. The anode material for the lithium-ion battery prepared by the anthracite has the characteristics of high gram specific capacity, strong intermolecular bonding force, low thermal expansion coefficient, good high and low temperature resistance, long cycle life, high compacted density of pole pieces and the like.
Description
Technical field
The present invention relates to a kind of lithium ion battery negative material and preparation method thereof with the anthracite preparation.
Background technology
At present, domestic branch two classes that are used to make carbon negative electrode material of lithium ion cell: Delanium and native graphite, Delanium have MCMB (MCMB), mesocarbon fiber (MCF) and graphous graphite powder.Preceding two kinds of Delaniums are the negative materials that are widely adopted, and have that particle shape is good, irreversible capacity loss is low, the advantage of stable circulation, but also have the shortcoming that discharge capacity is low, preparation cost is high.The discharge capacity of MCMB is generally about 320mAh/g, and preparation cost is higher, has limited its application aspect electrokinetic cell.Native graphite has low embedding current potential, and good embedding-Tuo embedding performance is good lithium ion battery negative material.But its shortcoming is that graphite layers is with more weak intermolecular force, it is the Van der Waals force combination, during charging, embedding along with the solvation lithium ion, can produce between layer and the layer and peel off (exfoliation) and form new surface, organic electrolyte continuous reduction decomposition on the new surface that forms forms new SEI film, a large amount of lithium ions had both been consumed, strengthened irreversible capacity loss first, simultaneously again because the embedding of solvation lithium ion and deviate from the volumetric expansion and the contraction that can cause graphite granule, cause intergranular energising network portion to be interrupted, so cycle life is very poor.In addition, also there is the low shortcoming of tap density in native graphite, has also influenced its volume and capacity ratio.
Graphite is modified, can be improved its reversible capacity and cycle life greatly.Modification processing method commonly used has surface oxidation, surface to coat various soft charcoals and hard charcoal etc.But common modification is handled and is still existed the coulombic efficiency of first charge-discharge lower; The surface oxidation method can not fundamentally solve the cyclical stability problem of high crystallinity graphite.Gu the domestic and international at present modification process of employing usually is to adopt solid-method coating pitch,, influenced cycle performance Gu cause that owing to the particle of conglomeration being pulverized after solid-coating coating layer is imperfect; And cause after the coating charing that specific capacity reduces, poorly conductive defective such as multiplying power discharging greatly, the comprehensive electrochemical of negative material can not effectively be improved.The specific capacity of domestic now Delanium product can only reach 300～310mAh/g, and modified natural graphite negative material specific capacity both domestic and external reaches 330～345mAh/g, still has bigger gap apart from the theoretical capacity of graphite; And the domestic like product of cycle life only reaches 400 times, external advanced material can reach 500 times, aspect the doff lithium characteristic of graphite-like negative material, it is generally acknowledged at present in the first charge-discharge process and to have formed solid electrolyte intermediate coat (SEI film) on the negative material surface, form the SEI film and need consume lithium ion, cause bigger irreversible capacity loss.The graphite-like negative material is because its inside residing chemical state difference of carbon atom everywhere, and the SEI film of formation is inhomogeneous, and with the defective tightness that combines of material with carbon element, the destruction of causing the SEI film in the cyclic process is afterwards worsened battery performance easily.
Native graphite can be divided into crystalloid graphite and aphanitic graphite according to its crystal habit.The crystalline size of aphanitic graphite is usually less than 1 micron, and the crystalline size of other native graphites and Delanium is usually greater than 1 micron, owing to the reason that becomes ore deposit mechanism, the impurity of aphanitic graphite raw ore is peeled off difficulty, the physical upgrading refining effect is not obvious, and the effect of chemical purification is also low than crystalline flake graphite, and needing repeatedly purifies just can reach high-purity micro crystal graphite, so the application of aphanitic graphite mainly making cast paint, carbon paste, refractory material etc., still is not used in battery material.
Summary of the invention
The technical problem to be solved in the present invention is that the SEI film of preparation cost height, formation of graphite-like negative material is inhomogeneous, the defective tightness that combines with material with carbon element, the destruction of causing the SEI film in the easy cyclic process afterwards, worsen battery performance, the preparation method of the aphanitic graphite of a kind of usefulness that is used for lithium ion battery negative material anthracite preparation with low cost is provided.
Technical scheme of the present invention is: a kind of lithium ion battery negative material with the anthracite preparation, and its particle size distribution D10 is that 6～10 μ m, D50 are that 17～20 μ m, D90 are 28～50 μ m, tap density is 0.8～1.6g/cm
3, carbon content is 93.0～99.99%, degree of graphitization is 85～97%.
With the lithium ion battery of the anthracite preparation preparation method with negative material, it comprises the steps:
(1) chooses Vdaf% 0～7.5, Hdaf% is 0～4, the average maximum reflectivity of vitrinite is higher than 6%, the dry ash free basis high heating value is lower than the anthracite of 22%MJ/KG, after crushed, it is that D10 is that 6～10 μ m, D50 are that 17～20 μ m, D90 are 28～50 μ m that classification goes out granulometry, and tap density is 0.8～1.6g/cm
3The anthracite precursor;
(2) the anthracite precursor in the step (1) and sodium chloride, sodium fluoride is even by 1: 0.03～0.05: 0.03～0.05 mixed, under nitrogen protection,, be carbonization 5～8 hours in 200～1600 ℃ the high temperature kiln in temperature with airtight kiln;
(3) with the anthracite in the step (2) under 2000～2500 ℃ condition, reacted 40～60 minutes, then with mixer mix 30～50 minutes, with magnetic separator de-ironing deironing 10～30 seconds, sieve with 100～200 eye mesh screens again, make aphanitic graphite.
Pulverising step in the described step (1) is: earlier anthracite being gone out particle size distribution D50 with ball mill fragmentation, classification is 0～30 μ m, and tap density is 0.8～1.0g/cm
3Powdered anthracite precursor, be 1～1.5g/cm with density then
3Magnetite powder and the mixture of water be heavy media coal separation, washing goes out that carbon content is more than 93%, caloric value is that 7000 kilocalories are above, intensity is the above anthracites of 30 MPas, and then through the Raymond machine coarse crushing, pulverizing out granule size is the granular anthracite of 50～80 μ m, uses airslide disintegrating mill attritioning, classification at last.
Described mixer is " v " type mixer, and magnetic separator de-ironing is 1380 Gao silk magnetic separator de-ironings.
The invention has the beneficial effects as follows: aphanitic graphite compact structure, the density height of the present invention preparation, characteristics such as the lithium cell cathode material of making has the gram volume height, intermolecular adhesion is strong, thermal coefficient of expansion is low, high and low temperature resistance is good, have extended cycle life, pole piece compacted density height.
It is as shown in table 1 that the negative material of making of the present invention is applied to make 300 all loop-around datas of 584255A battery, and design capacity is 1500mAh.
300 all loop-around datas of table 1 584255A battery
It is as shown in table 2 that the negative material of making of the present invention is applied to make the loop-around data in 100 weeks of 403036A type battery, and design capacity is 450mAh.
The loop-around data in table 2 403036A type 100 weeks of battery
Material part physics before and after making, electrochemistry index performance comparison are as shown in table 3
Material part physics, electrochemistry index performance comparison before and after table 3 is made
Description of drawings
Fig. 1 is the negative material appearance figure of Delanium preparation;
Fig. 2 is the negative material shape appearance figure of native graphite preparation;
Fig. 3 goes bad into the negative material shape characteristic of aphanitic graphite preparation for anthracite;
Fig. 4 is the chemical property that is used to make battery material.
Embodiment
Embodiment 1
A kind of lithium ion battery negative material with the anthracite preparation, its particle size distribution D10 is that 6～10 μ m, D50 are that 17～20 μ m, D90 are 28～50 μ m, tap density is 0.9g/cm
3, carbon content is 97%, degree of graphitization is 87%.
Prepare the preparation method of lithium ion battery with the aphanitic graphite negative material with anthracite, it comprises the steps:
(1) chooses Vdaf% 0～7.5, Hdaf% is 0～4, and the average maximum reflectivity of vitrinite is higher than 6%, and the dry ash free basis high heating value is lower than the anthracite of 22%MJ/KG, earlier anthracite being gone out particle size distribution D50 with ball mill fragmentation, classification is 0～30mm, and tap density is 0.8g/cm
3Powdered anthracite precursor, be 1g/cm with density then
3Magnetite powder and the mixture of water be heavy media coal separation, washing goes out that carbon content is more than 93%, caloric value is that 7000 kilocalories are above, intensity is the above anthracites of 30 MPas, and then through the Raymond machine coarse crushing, pulverizing out granule size is the granular anthracite of 50～80 μ m, going out granulometry with airslide disintegrating mill attritioning, classification at last is that D10 is that 6～10 μ m, D50 are that 17～20 μ m, D90 are 28～50 μ m, and tap density is 0.8g/cm
3The anthracite precursor;
(2) the anthracite precursor in the step (1) and sodium chloride, sodium fluoride is even by 1: 0.03: 0.03 mixed, under nitrogen protection,, be carbonization 4 hours in 200～1600 ℃ the high temperature kiln in temperature with airtight kiln;
(3) with the anthracite in the step (2) under 2000～2500 ℃ condition, reacted, use v then 40 minutes " the type mixer mix 40 minutes, with 1380 Gao silk magnetic separator de-ironing deironing 20 seconds, sieve with 200 eye mesh screens again, make aphanitic graphite.
Embodiment 2
A kind of lithium ion battery negative material with the anthracite preparation, its particle size distribution D10 is that 6～10 μ m, D50 are that 17～20 μ m, D90 are 35～50 μ m, tap density is 1.1g/cm
3, carbon content is 98.0%, degree of graphitization is 90%.
With the lithium ion battery of the anthracite preparation preparation method with negative material, it comprises the steps:
(1) chooses Vdaf% 0～7.5, Hdaf% is 0～4, and the average maximum reflectivity of vitrinite is higher than 6%, and the dry ash free basis high heating value is lower than the anthracite of 22%MJ/KG, earlier anthracite being gone out particle size distribution D50 with ball mill fragmentation, classification is 0～30mm, and tap density is 1.0g/cm
3Powdered anthracite precursor, be 1.5g/cm with density then
3Magnetite powder and the mixture of water be heavy media coal separation, washing goes out that carbon content is more than 93%, caloric value is that 7000 kilocalories are above, intensity is the above anthracites of 30 MPas, and then through the Raymond machine coarse crushing, pulverizing out granule size is the granular anthracite of 50～80 μ m, going out granulometry with airslide disintegrating mill attritioning, classification at last is that D10 is that 6～10 μ m, D50 are that 17～20 μ m, D90 are 28～50 μ m, and tap density is 1.0g/cm
3The anthracite precursor;
(2) the anthracite precursor in the step (1) and sodium chloride, sodium fluoride is even by 1: 0.05: 0.05 mixed, under nitrogen protection,, be carbonization 8 hours in 200～1600 ℃ the high temperature kiln in temperature with airtight kiln;
(3) with the anthracite in the step (2) under 2000～2500 ℃ condition, reacted, use v then 50 minutes " the type mixer mix 50 minutes, with 1380 Gao silk magnetic separator de-ironing deironing 30 seconds, sieve with 100 eye mesh screens again, make aphanitic graphite.
Embodiment 3
A kind of lithium ion battery negative material with the anthracite preparation, its particle size distribution D10 is that 6～10 μ m, D50 are that 17～20 μ m, D90 are 35～50 μ m, tap density is 1.2g/cm
3, carbon content is 98.5%, degree of graphitization is 92%.
With the lithium ion battery of the anthracite preparation preparation method with negative material, it comprises the steps:
(1) chooses Vdaf% 0～7.5, Hdaf% is 0～4, and the average maximum reflectivity of vitrinite is higher than 6%, and the dry ash free basis high heating value is lower than the anthracite of 22%MJ/KG, earlier anthracite being gone out particle size distribution D50 with ball mill fragmentation, classification is 0～30mm, and tap density is 0.9g/cm
3Powdered anthracite precursor, be 1～1.5g/cm with density then
3Magnetite powder and the mixture of water be heavy media coal separation, washing goes out that carbon content is more than 93%, caloric value is that 7000 kilocalories are above, intensity is the above anthracites of 30 MPas, and then through the Raymond machine coarse crushing, pulverizing out granule size is the granular anthracite of 50～80 μ m, going out granulometry with airslide disintegrating mill attritioning, classification at last is that D10 is that 6～10 μ m, D50 are that 17～20 μ m, D90 are 28～50 μ m, and tap density is 1.2g/cm
3The anthracite precursor;
(2) the anthracite precursor in the step (1) and sodium chloride, sodium fluoride is even by 1: 0.03: 0.03 mixed, under nitrogen protection,, be carbonization 6 hours in 200～1600 ℃ the high temperature kiln in temperature with airtight kiln;
(3) with the anthracite in the step (2) under 2000～2500 ℃ condition, reacted, use v then 45 minutes " the type mixer mix 40 minutes, with 1380 Gao silk magnetic separator de-ironing deironing 20 seconds, sieve with 160 eye mesh screens again, make aphanitic graphite.
Embodiment 4
A kind of lithium ion battery negative material with the anthracite preparation, its particle size distribution D10 is that 6～10 μ m, D50 are that 17～20 μ m, D90 are 45～50 μ m, tap density is 1.4g/cm
3, carbon content is 99.99%, degree of graphitization is 97%.
With the lithium ion battery of the anthracite preparation preparation method with negative material, it comprises the steps:
(1) chooses Vdaf% 0～7.5, Hdaf% is 0～4, and the average maximum reflectivity of vitrinite is higher than 6%, and the dry ash free basis high heating value is lower than the anthracite of 22%MJ/KG, earlier anthracite being gone out particle size distribution D50 with ball mill fragmentation, classification is 0～30mm, and tap density is 1.0g/cm
3Powdered anthracite precursor, be 1.5g/cm with density then
3Magnetite powder and the mixture of water be heavy media coal separation, washing goes out that carbon content is more than 93%, caloric value is that 7000 kilocalories are above, intensity is the above anthracites of 30 MPas, and then through the Raymond machine coarse crushing, pulverizing out granule size is the granular anthracite of 50～80 μ m, going out granulometry with airslide disintegrating mill attritioning, classification at last is that D10 is that 6～10 μ m, D50 are that 17～20 μ m, D90 are 28～50 μ m, and tap density is 1.6g/cm
3The anthracite precursor;
(2) the anthracite precursor in the step (1) and sodium chloride, sodium fluoride is even by 1: 0.04: 0.04 mixed, under nitrogen protection,, be carbonization 6 hours in 1200～1600 ℃ the high temperature kiln in temperature with airtight kiln;
(3) with the anthracite in the step (2) under 2300～2500 ℃ condition, reacted, use v then 60 minutes " the type mixer mix 50 minutes, with 1380 Gao silk magnetic separator de-ironing deironing 30 seconds, sieve with 120 eye mesh screens again, make aphanitic graphite.
In the foregoing description, the aphanitic graphite of preparation is used for lithium ion battery negative material.
Claims (4)
1. lithium ion battery negative material with anthracite preparation, it is characterized in that: its particle size distribution D10 is that 6～10 μ m, D50 are that 17～20 μ m, D90 are 28～50 μ m, and tap density is 0.8～1.6g/cm
3, carbon content is 93.0～99.99%, degree of graphitization is 85～97%.
2. the lithium ion battery with the anthracite preparation as claimed in claim 1 preparation method of negative material is characterized in that it comprises the steps:
(1) chooses Vdaf% 0～7.5, Hdaf% is 0～4, the average maximum reflectivity of vitrinite is higher than 6%, the dry ash free basis high heating value is lower than the anthracite of 22%MJ/KG, after crushed, it is that D10 is that 6～10 μ m, D50 are that 17～20 μ m, D90 are 28～50 μ m that classification goes out granulometry, and tap density is 0.8～1.6g/cm
3The anthracite precursor;
(2) the anthracite precursor in the step (1) and sodium chloride, sodium fluoride is even by 1: 0.03～0.05: 0.03～0.05 mixed, under nitrogen protection,, be carbonization 5～8 hours in 200～1600 ℃ the high temperature kiln in temperature with airtight kiln;
(3) with the anthracite in the step (2) under 2000～2500 ℃ condition, reacted 40～60 minutes, then with mixer mix 30～50 minutes, with magnetic separator de-ironing deironing 10～30 seconds, sieve with 100～200 eye mesh screens again, make aphanitic graphite.
3. the lithium ion battery with the anthracite preparation according to claim 2 preparation method of negative material, it is characterized in that: the pulverising step in the described step (1) is: earlier anthracite being gone out particle size distribution D50 with ball mill fragmentation, classification is 0～30mm, and tap density is 0.8～1.0g/cm
3Powdered anthracite precursor, be 1～1.5g/cm with density then
3Magnetite powder and the mixture of water be heavy media coal separation, washing goes out that carbon content is more than 93%, caloric value is that 7000 kilocalories are above, intensity is the above anthracites of 30 MPas, and then through the Raymond machine coarse crushing, pulverizing out granule size is the granular anthracite of 50～80 μ m, uses airslide disintegrating mill attritioning, classification at last.
4. the lithium ion battery with the anthracite preparation according to claim 2 preparation method of negative material, it is characterized in that: described mixer is " v " type mixer, magnetic separator de-ironing is 1380 Gao silk magnetic separator de-ironings.
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| CN108682804A (en) * | 2018-04-25 | 2018-10-19 | 福建翔丰华新能源材料有限公司 | A kind of hard carbon cladding soft carbon is used as the preparation method of lithium ion battery negative material |
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