CN116177543A - A kind of preparation method of negative electrode material of lithium ion battery - Google Patents
A kind of preparation method of negative electrode material of lithium ion battery Download PDFInfo
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 39
- 239000007773 negative electrode material Substances 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000010439 graphite Substances 0.000 claims abstract description 24
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 239000006253 pitch coke Substances 0.000 claims abstract description 14
- 238000005087 graphitization Methods 0.000 claims abstract description 13
- 238000003763 carbonization Methods 0.000 claims abstract description 9
- 239000002006 petroleum coke Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 5
- 239000011331 needle coke Substances 0.000 claims abstract description 5
- 239000010426 asphalt Substances 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 13
- 239000000571 coke Substances 0.000 claims description 11
- 239000010405 anode material Substances 0.000 claims description 7
- 239000011295 pitch Substances 0.000 claims description 7
- 238000007493 shaping process Methods 0.000 claims description 4
- 238000004898 kneading Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 239000010406 cathode material Substances 0.000 claims 3
- 238000010000 carbonizing Methods 0.000 claims 1
- 239000011333 coal pitch coke Substances 0.000 claims 1
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 238000002156 mixing Methods 0.000 claims 1
- 238000000465 moulding Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 16
- 239000003575 carbonaceous material Substances 0.000 abstract description 2
- 239000011294 coal tar pitch Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 3
- 229910021383 artificial graphite Inorganic materials 0.000 description 2
- 239000011336 carbonized pitch Substances 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000002001 electrolyte material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
- C01B32/205—Preparation
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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
- 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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- 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
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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
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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
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- 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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Abstract
一种锂离子电池负极材料的制备方法，属于碳素材料和锂离子二次能源材料的交叉技术领域。该方法以沥青焦为原料，挤注成电极，经炭化和石墨化后，再破碎加工成锂离子电池负极材料。具体为：以沥青焦(石油焦、针状焦等)为原料，以沥青为粘结剂混捏挤注成型，再经炭化和石墨化，然后经破碎整形等工艺制备石墨基锂离子电池负极材料。该方法可有效缩短生产周期，同时也降低了生产成本，而且对原料要求不高，很好地解决了工业石墨电极高附加价值利用问题。The invention discloses a method for preparing a negative electrode material of a lithium ion battery, which belongs to the cross technical field of carbon materials and lithium ion secondary energy materials. In the method, pitch coke is used as a raw material, extruded into an electrode, and after carbonization and graphitization, it is crushed and processed into a negative electrode material of a lithium ion battery. Specifically: using pitch coke (petroleum coke, needle coke, etc.) . The method can effectively shorten the production cycle and reduce the production cost at the same time, and has low requirements on raw materials, which well solves the problem of high value-added utilization of industrial graphite electrodes.
Description
技术领域technical field
本发明属于碳素材料和锂离子二次能源材料的交叉技术领域，涉及一种锂离子电池负极材料的制备方法，更具体为以工业沥青焦为原料，先石墨化后，再破碎加工成锂离子电池负极材料的新方法。The invention belongs to the cross technical field of carbon materials and lithium ion secondary energy materials, and relates to a preparation method of lithium ion battery negative electrode materials, more specifically, using industrial pitch coke as raw material, first graphitizing, and then crushing and processing into lithium A new approach to anode materials for ion batteries.
背景技术Background technique
随着电子工业的快速发展，各种便携设备被广泛应用，也对移动电源性能要求更高，尤其近年随着一次能源短缺问题日益突出，电动汽车也将逐渐代替常规燃动力汽车，这样对二次电源提供了更广阔市场。锂离子电池因具有工作电压高、比能量高、容量大、自放电小、循环性好、使用寿命长、质量轻、体积小和污染小等优点而成为移动电话、笔记本电脑等移动电子设备的理想电源，并有可能成为未来电动汽车、电动自行车等的主要动力来源，此外风能、太阳能灯清洁能源的储存也给锂离子电池带来更大市场空间，因此锂离子电池被称为21世纪的绿色能源和主导电源，具有广泛的应用前景。With the rapid development of the electronics industry, various portable devices are widely used, and the performance requirements for mobile power sources are also higher. Especially in recent years, as the primary energy shortage problem has become increasingly prominent, electric vehicles will gradually replace conventional fuel-powered vehicles. Secondary power provides a broader market. Lithium-ion batteries have become the preferred choice of mobile electronic devices such as mobile phones and notebook computers due to their advantages such as high working voltage, high specific energy, large capacity, small self-discharge, good cycle performance, long service life, light weight, small size and low pollution. It is an ideal power source and may become the main source of power for electric vehicles and electric bicycles in the future. In addition, the storage of clean energy from wind energy and solar lights will also bring more market space to lithium-ion batteries, so lithium-ion batteries are called the 21st century. Green energy and leading power supply have broad application prospects.
锂离子电池的电化学性能主要取决于所用正负极材料和电解质材料的结构和性能，尤其是正负极材料的选择和质量直接决定着锂离子电池的特性和价格。石墨负极材料目前仍然是锂离子电池负极主要使用的材料，其稳定的结构特性使其具有较高的容量发挥，较佳的循环稳定性，较好的低温及倍率特性，同时优异的性价比也使其在锂离子电池负极材料中需求量十分巨大，但现有的人造石墨制备成本较高，如何拓展人造石墨的原料，降低负极材料生产成本是未来生产厂家面对的问题。本发明借鉴石墨电极生产工艺，采用多种沥青焦原料，挤注成电极，经炭化和石墨化后，再破碎整形加工成锂离子电池负极材料。相对于现有的锂离子电池负极材料制备方法中存在石墨化不均匀，且石墨化成本和周期长的缺点；而本发明借鉴工业石墨电极的制备方法，可有效较低生产成本和周期，同时较好地解决了产品石墨化不均匀的问题。这是一种快速和低成本负极材料制备方法，具有巨大的经济价值和社会效益。The electrochemical performance of lithium-ion batteries mainly depends on the structure and performance of the positive and negative electrode materials and electrolyte materials used, especially the selection and quality of positive and negative electrode materials directly determine the characteristics and price of lithium-ion batteries. Graphite anode material is still the main material used in the anode of lithium-ion batteries. Its stable structural characteristics make it have higher capacity, better cycle stability, better low temperature and rate characteristics, and excellent cost performance. It has a huge demand in lithium-ion battery anode materials, but the existing artificial graphite has a high production cost. How to expand the raw materials of artificial graphite and reduce the production cost of anode materials is a problem that manufacturers will face in the future. The invention uses graphite electrode production technology for reference, adopts various pitch coke raw materials, extrudes and injects them into electrodes, and after carbonization and graphitization, crushes and reshapes them into lithium-ion battery negative electrode materials. Compared with the disadvantages of uneven graphitization and long graphitization cost and cycle in the existing lithium ion battery negative electrode material preparation method; and the present invention draws lessons from the preparation method of industrial graphite electrodes, which can effectively lower the production cost and cycle, and at the same time The problem of uneven graphitization of the product is better solved. This is a fast and low-cost anode material preparation method, which has great economic value and social benefits.
基于此，本发明与现有的锂离子电池负极材料生产方法不同之处在于以多种沥青焦为原料，先进行石墨化，再破碎整形制备负极材料，可有效缩短生产周期，省去颗粒包覆工艺，同时也降低了生产成本，原料来源更广泛。Based on this, the difference between the present invention and the existing lithium-ion battery negative electrode material production method is that various pitch cokes are used as raw materials, first graphitized, and then crushed and shaped to prepare the negative electrode material, which can effectively shorten the production cycle and save particle packaging. The cladding process also reduces the production cost, and the source of raw materials is wider.
发明内容Contents of the invention
针对现有方法的不足，本发明的目的是在于提供一种锂离子电池负极材料的制备方法，该方法以普通的工业沥青焦为原料，挤注成电极，经炭化和石墨化后，再破碎整形加工成锂离子电池负极材料，该方法可有效缩短生产周期，省去颗粒包覆工艺，同时也降低了生产成本，原料来源更广泛，是一种快速和低成本负极材料制备方法，很好地解决了工业石墨电极高附加价值利用问题，通过降低原料成本，有效解决逐年上涨锂离子电池负极材料生产原料价格走高的不足之处，具有巨大的经济价值和社会效益。Aiming at the deficiencies of the existing methods, the purpose of the present invention is to provide a preparation method for the negative electrode material of lithium ion battery. Shaping and processing into lithium-ion battery negative electrode materials, this method can effectively shorten the production cycle, save the particle coating process, and also reduce production costs, and the source of raw materials is wider. It is a fast and low-cost negative electrode material preparation method, which is very good It solves the problem of high value-added utilization of industrial graphite electrodes, and effectively solves the problem of rising raw material prices for lithium-ion battery anode materials year by year by reducing the cost of raw materials. It has huge economic value and social benefits.
为了实现上述目的，本发明采用的技术方案如下：In order to achieve the above object, the technical scheme adopted in the present invention is as follows:
本发明的一种锂离子电池负极材料的制备方法，以工业沥青焦为原料，挤注成电极，先炭化后，再石墨化，再破碎加工成锂离子电池负极材料，具体步骤如下：The preparation method of a lithium-ion battery negative electrode material of the present invention uses industrial pitch coke as a raw material, squeezes and injects it into an electrode, first carbonizes, then graphitizes, and then crushes and processes it into a lithium-ion battery negative electrode material. The specific steps are as follows:
步骤1：备料Step 1: Prepare materials
将工业沥青焦干燥，破碎，得到沥青焦粉；其中，沥青焦粉的粒径为500μm以下；Drying and crushing the industrial pitch coke to obtain pitch coke powder; wherein, the particle size of the pitch coke powder is below 500 μm;
所述的步骤1中，工业沥青焦选自石油焦，煤沥青焦，针状焦或石墨碎中的一种或几种。In the step 1, the industrial pitch coke is selected from one or more of petroleum coke, coal tar pitch coke, needle coke or graphite chips.
步骤2：挤注Step 2: Squeeze
将沥青焦粉和中温沥青混捏均匀后，挤注成型，得到电极；After kneading pitch coke powder and medium-temperature pitch evenly, extrusion molding is obtained to obtain electrodes;
所述的步骤2中，按质量比，沥青焦粉：中温沥青＝100：(22～26)。In the step 2, according to the mass ratio, pitch coke powder:medium temperature pitch=100:(22-26).
所述的步骤2中，中温沥青为软化点为60-90℃。In the step 2, the medium temperature asphalt has a softening point of 60-90°C.
所述的步骤2中，电极的直径为100～300mm。In the step 2, the diameter of the electrode is 100-300mm.
步骤3：炭化Step 3: Carbonization
将电极在1200～1300℃进行炭化处理，得到炭化沥青焦；Carbonize the electrode at 1200-1300°C to obtain carbonized pitch coke;
所述的步骤3中，炭化处理时间为6～8h。In the step 3, the carbonization treatment time is 6-8 hours.
步骤4：石墨化Step 4: Graphitization
将炭化沥青焦置于2800℃以上进行石墨化，得到石墨体；The carbonized pitch coke is placed above 2800°C for graphitization to obtain a graphite body;
所述的步骤4中，石墨化时间为2.5～3h。In the step 4, the graphitization time is 2.5-3 hours.
步骤5：后处理Step 5: Postprocessing
将石墨体进行破碎、整形、筛分，得到锂离子电池负极材料。The graphite body is crushed, shaped and screened to obtain the negative electrode material of the lithium ion battery.
所述的步骤5中，破碎为将石墨体破碎至100μm以下，得的锂离子电池负极材料的粒度的D50为15-19μm。In the step 5, crushing is to crush the graphite body to be below 100 μm, and the particle size D50 of the lithium ion battery negative electrode material obtained is 15-19 μm.
所述的步骤5中，通过整形工艺，使颗粒的球化率大于50％。In the step 5, the spheroidization rate of the particles is greater than 50% through the shaping process.
所述的步骤5中，通过筛分工艺产品粒度在300目以下。In the step 5, the particle size of the product through the screening process is below 300 mesh.
与现有技术相比，本发明具有以下优点：Compared with the prior art, the present invention has the following advantages:
(1)所选原料可以为各种沥青焦，包括各种石油焦，煤沥青焦，针状焦及石墨碎等，从而降低负极材料生产对原料的要求。(1) The selected raw materials can be various pitch cokes, including various petroleum cokes, coal tar pitch cokes, needle cokes and crushed graphite, etc., thereby reducing the raw material requirements for negative electrode material production.
(2)采用传统工业石墨电极生产工艺制备出石墨电极，然后破碎和整形工艺制备出负极材料。可有效缩短生产周期，同时也降低了生产成本，而且对原料要求不高。(2) The graphite electrode is prepared by the traditional industrial graphite electrode production process, and then the negative electrode material is prepared by the crushing and shaping process. The production cycle can be effectively shortened, the production cost is also reduced, and the requirement for raw materials is not high.
(3)通过在混捏过程中沥青，起到包覆作用，省略了负极材料生产中包覆工艺。(3) The asphalt plays a coating role in the kneading process, omitting the coating process in the production of negative electrode materials.
具体实施方式Detailed ways
下面通过实施例对本发明的具体过程给予明示，应当理解，此处所描述的具体实例仅仅用于解释本发明，并不用于限定本发明。The following examples illustrate the specific process of the present invention. It should be understood that the specific examples described here are only used to explain the present invention and are not intended to limit the present invention.
实施例1Example 1
将所选的石油焦干燥，采用机械破碎至150目以下，然后配上占石油焦的质量百分比为23％比例的中温沥青(软化点为60-90℃)进行混捏均匀，然后挤注成型150mm直径的圆形型材，在1250℃进行炭化处理7h，然后在内串石墨炉中进行石墨化处理(大于2800℃)2.5h。得到的石墨化体再进行破碎和整形然后进行球化处理，筛分(粒度在350目以下)制备出锂离子电池负极材料。The selected petroleum coke is dried, mechanically crushed to below 150 mesh, and then mixed with medium-temperature pitch (softening point: 60-90°C) accounting for 23% of the petroleum coke by mass, kneaded evenly, and then extruded into a 150mm The diameter of the round profile is carbonized at 1250°C for 7 hours, and then graphitized in the inner series graphite furnace (greater than 2800°C) for 2.5 hours. The obtained graphitized body is then crushed and reshaped, then spheroidized, and sieved (with a particle size below 350 mesh) to prepare a negative electrode material for a lithium ion battery.
实施例2Example 2
将所选的石油焦干燥，采用机械破碎至150目以下，然后配上占石油焦的质量百分比为26％比例的中温沥青(软化点为60-90℃)进行混捏均匀，然后挤注成型200mm直径的圆形型材，在1300℃进行炭化处理8h，然后在内串石墨炉中进行石墨化处理(大于2800℃)2.5h。得到的石墨体再进行破碎和整形然后进行球化处理，筛分(粒度在350目以下)制备出锂离子电池负极材料。The selected petroleum coke is dried, mechanically crushed to below 150 mesh, and then mixed with medium-temperature pitch (softening point: 60-90°C) accounting for 26% by mass of petroleum coke, kneaded evenly, and then extruded into 200mm The diameter of the round profile is carbonized at 1300°C for 8 hours, and then graphitized in the inner series graphite furnace (greater than 2800°C) for 2.5 hours. The obtained graphite body is crushed and reshaped, then spheroidized, and sieved (with a particle size below 350 mesh) to prepare a negative electrode material for a lithium ion battery.
实施例3Example 3
将所选的煤沥青焦干燥，采用机械破碎至150目以下，然后配上占煤沥青焦的质量百分比为25％比例的中温沥青(软化点为60～90℃)进行混捏均匀，然后挤注成型300mm直径的圆形型材，在1300℃进行炭化处理8h，然后在内串石墨炉中进行石墨化处理(大于2800℃)3h。得到的石墨体再进行破碎和整形然后进行球化处理，筛分(粒度在350目以下)制备出锂离子电池负极材料。The selected coal tar pitch coke is dried, mechanically crushed to below 150 mesh, and then mixed with medium temperature pitch (softening point: 60-90°C) accounting for 25% by mass of the coal tar pitch coke, kneaded evenly, and then extruded Form a circular profile with a diameter of 300mm, conduct carbonization treatment at 1300°C for 8 hours, and then carry out graphitization treatment (greater than 2800°C) for 3 hours in an inner series graphite furnace. The obtained graphite body is crushed and reshaped, then spheroidized, and sieved (with a particle size below 350 mesh) to prepare a negative electrode material for a lithium ion battery.
实施例4Example 4
将所选的水墨碎干燥，采用机械破碎至200目以下，然后配上占水墨碎的质量百分比为26％比例的中温沥青(软化点为60-90℃)进行混捏均匀，然后挤注成型100mm直径的圆形型材，在1200℃进行炭化处理6h，然后在内串石墨炉中进行石墨化处理(大于2800℃)2.5h。得到的石墨体再进行破碎和整形然后进行球化处理，筛分(粒度在350目以下)制备出锂离子电池负极材料。Dry the selected ink crumbs, mechanically crush them to less than 200 mesh, and then mix them with medium-temperature asphalt (softening point: 60-90°C) at a mass percentage of 26% of the ink crumbs, knead them evenly, and then extrude them into 100mm The diameter of the round profile is carbonized at 1200°C for 6 hours, and then graphitized in the inner series graphite furnace (greater than 2800°C) for 2.5 hours. The obtained graphite body is crushed and reshaped, then spheroidized, and sieved (with a particle size below 350 mesh) to prepare a negative electrode material for a lithium ion battery.
实施例5Example 5
将所选的针状焦干燥，采用机械破碎至200目以下，然后配上占针状焦的质量百分比为25％比例的中温沥青(软化点为60-90℃)进行混捏均匀，然后挤注成型100mm直径的圆形型材，在1200℃进行炭化处理6h，然后在内串石墨炉中在3000℃进行石墨化处理2.5h。得到的石墨体再进行破碎和整形然后进行球化处理，筛分(粒度在350目以下)制备出锂离子电池负极材料。The selected needle coke is dried, mechanically crushed to below 200 mesh, and then mixed with medium-temperature pitch (softening point: 60-90°C) accounting for 25% by mass of the needle coke, kneaded evenly, and then extruded Form a circular profile with a diameter of 100mm, carry out carbonization treatment at 1200°C for 6h, and then carry out graphitization treatment at 3000°C for 2.5h in an inner series graphite furnace. The obtained graphite body is crushed and reshaped, then spheroidized, and sieved (with a particle size below 350 mesh) to prepare a negative electrode material for a lithium ion battery.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH103922A (en) * | 1996-06-14 | 1998-01-06 | Nippon Carbon Co Ltd | Carbon or graphite powder for lithium battery negative electrode material |
| CN102522532A (en) * | 2011-12-26 | 2012-06-27 | 中科恒达石墨股份有限公司 | Novel cathode material for lithium ion battery and preparation method thereof |
| CN104425823A (en) * | 2013-09-11 | 2015-03-18 | 宁波杉杉新材料科技有限公司 | Artificial graphite cathode material of lithium ion battery and preparation method of artificial graphite cathode material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH103922A (en) * | 1996-06-14 | 1998-01-06 | Nippon Carbon Co Ltd | Carbon or graphite powder for lithium battery negative electrode material |
| CN102522532A (en) * | 2011-12-26 | 2012-06-27 | 中科恒达石墨股份有限公司 | Novel cathode material for lithium ion battery and preparation method thereof |
| CN104425823A (en) * | 2013-09-11 | 2015-03-18 | 宁波杉杉新材料科技有限公司 | Artificial graphite cathode material of lithium ion battery and preparation method of artificial graphite cathode material |
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