Lithium ion battery cathode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, which can be applied to battery electrodes, circuits, electrical components, etc., and can solve problems such as affecting cycle stability and sheet shedding

Inactive Publication Date: 2012-06-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The layer structure of flake graphite is relatively regular, which is conducive to the intercalation and extraction of lithium ions, and the reversible capacity can reach 300-350mAh / g. However, due to the expansion and contraction of the charge and discharge process between the layers is unidirectional, it is easy to cause flaky The shedding will affect the cycle stability

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0018] A lithium-ion battery negative electrode material, the raw materials of which include anthracite and coal tar pitch, the anthracite is Taixi coal produced in Rujigou, Shizuishan City, Ningxia Hui Autonomous Region, and the coal tar pitch is medium temperature pitch.

[0019] A preparation method of lithium ion battery negative electrode material, is characterized in that, comprises the following steps:

[0020] In the first step, high-quality anthracite is graphitized in a graphitization furnace at 2800°C. The obtained graphitized anthracite has a fixed carbon content of 99.9% and a graphitization degree of 83%;

[0021] In the second step, the obtained graphitized anthracite is pulverized and classified, so that the obtained graphitized anthracite particle size ranges from 5 μm to 50 μm, D 50 21.45 μm;

[0022] In the third step, the carbon precursor is coated on the graphitized anthracite by a liquid-phase coating method, and the coal tar pitch is dissolved in toluen...

Embodiment 2

[0027] A lithium-ion battery negative electrode material, the raw materials of which include anthracite and phenolic resin, the anthracite is Taixi coal produced in Rujigou, Shizuishan City, Ningxia Hui Autonomous Region, and the phenolic resin is industrial grade.

[0028] A preparation method of lithium ion battery negative electrode material, is characterized in that, comprises the following steps:

[0029] In the first step, high-quality anthracite is graphitized in a graphitization furnace at 3000°C. The obtained graphitized anthracite has a fixed carbon content of 99.9% and a graphitization degree of 83%;

[0030] In the second step, the obtained graphitized anthracite is pulverized and classified, so that the obtained graphitized anthracite particle size ranges from 5 μm to 50 μm, D 50 21.45 μm;

[0031] In the third step, the carbon precursor is coated on the graphitized anthracite by a liquid-phase coating method, and the phenolic resin is dissolved in an ethanol sol...

Embodiment 3

[0036] A lithium-ion battery negative electrode material, the raw materials of which include anthracite and polyvinyl alcohol, the anthracite is Taixi coal produced in Rujigou, Shizuishan City, Ningxia Hui Autonomous Region, and the polyvinyl alcohol is industrial grade.

[0037] A preparation method of lithium ion battery negative electrode material, is characterized in that, comprises the following steps:

[0038] In the first step, high-quality anthracite is graphitized in a graphitization furnace at 3100°C. The obtained graphitized anthracite has a fixed carbon content of 99.9% and a graphitization degree of 83%;

[0039] In the second step, the obtained graphitized anthracite is pulverized and classified, so that the obtained graphitized anthracite particle size ranges from 5 μm to 50 μm, D 50 21.45 μm;

[0040] In the third step, the carbon precursor is coated on the graphitized anthracite by a liquid phase coating method, polyvinyl alcohol is dissolved in an aqueous so...

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Abstract

The invention relates to a lithium ion battery cathode material and a preparation method thereof, belonging to the field of preparation of lithium ion battery cathode materials. The invention is characterized in that the material has a graphite or carbon core shell structure, graphitized high-quality anthracite is used in a core material and amorphous carbon is used in a shell material. The graphitized high-quality anthracite is treated at a temperature of 2800 to 3100 DEG C, a graphitization degree is greater than 80%, the content of fixed carbon is greater than 99.9%, and the granularity of the anthracite is in a range of 5 mu m to 50 mu m; the amorphous carbon is prepared from a precursor which comprises asphalt, emulsified bitumen, phenolic resin, furfural resin, epoxy resin or resin materials. The lithium ion battery cathode material prepared in the invention is characterized in that initial efficiency is greater than 90%, initial discharge capacity is greater than 350 mAh/g and a capacity retention rate is greater than 90% after 200 cycles.

Description

technical field [0001] The invention relates to the field of preparation of negative electrode materials for lithium ion batteries, in particular to a negative electrode material for lithium ion batteries prepared by modification of natural anthracite and a preparation method thereof. Background technique [0002] Since Sony first launched lithium-ion batteries on the market in 1990, lithium-ion batteries have unique advantages compared with nickel-hydrogen nickel-cadmium rechargeable batteries, such as high specific energy, high operating voltage, long charge and discharge life, No memory effect, less environmental pollution, low self-discharge rate, etc., quickly occupied the market of commercial rechargeable batteries, especially as the power supply of small portable electrical appliances such as mobile phones, notebook computers, and digital cameras. In recent years, the research and application of positive and negative electrode materials and electrolyte systems of lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38
CPCY02E60/12Y02E60/10
Inventor 郑永平时迎迎黄正宏刘旋沈万慈
Owner TSINGHUA UNIV
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