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Preparation method of modified lithium ion battery graphite cathode material

A lithium-ion battery, graphite negative electrode technology, applied in the direction of battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems that are difficult to achieve uniform and controllable coating amount and industrialization, the decline of composite material capacity and rate performance, and the specific surface area of ​​materials Increase and other problems, to achieve the effect of preventing uneven coating, good controllability, and uniform viscosity

Inactive Publication Date: 2017-03-15
SHANGHAI SHANSHAN TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Too much coating of hard carbon on the surface leads to an increase in the specific surface area of ​​the material, an increase in Li+ consumed by the formation of the SEI film, and a longer lithium migration path. In addition, the efficiency of hard carbon itself is very low, which will cause the capacity and rate performance of the composite material to decline.
As far as the current technology is concerned, it is still difficult to achieve a good combination of uniform and controllable coating amount and industrial feasibility

Method used

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  • Preparation method of modified lithium ion battery graphite cathode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Evenly mix 1kg of natural graphite with an average particle size of 16μm and 0.1kg of coal-based pitch powder, 2 / Under stirring state, the temperature was raised to 550°C at 5°C / min, and the temperature was kept constant for 2h. Take out after natural cooling, in N 2 Under protection, the temperature was raised to 1100°C at 5°C / min and kept at a constant temperature for 1h, and after natural cooling, modified graphite A was obtained by classification.

[0020] (2) Add 1.040 kg of the obtained A powder into 5 L of water-soluble thermosetting phenolic resin solution with a concentration of 0.1 kg / L, and stir at 90° C. for 1 h to obtain solution B.

[0021] (3) Solution B was filtered and dried, rapidly heated to 150°C and kept at a constant temperature for 5 minutes, and cooled to room temperature to obtain precursor powder, which weighed 1.065kg, and the coating amount of water-soluble thermosetting phenolic resin was calculated to be 2.40%.

[0022] (4) Raise the...

Embodiment 2

[0024] (1) Evenly mix 1kg of natural graphite with an average particle size of 30μm and 0.1kg of coal-based pitch powder, 2 / Under stirring state, the temperature was raised to 550°C at 5°C / min, and the temperature was kept constant for 2h. Take out after natural cooling, in N 2 Under protection, the temperature was raised to 1100°C at 5°C / min and kept at a constant temperature for 1h, and after natural cooling, modified graphite A was obtained by classification.

[0025] (2) Add 1.036 kg of the obtained A powder into 5 L of water-soluble thermosetting phenolic resin solution with a concentration of 0.1 kg / L, and stir at 90° C. for 1 h to obtain solution B.

[0026] (3) Solution B was filtered and dried, rapidly heated to 150°C and kept at a constant temperature for 5 minutes, and cooled to room temperature to obtain precursor powder, which weighed 1.057kg, and the coating amount of water-soluble thermosetting phenolic resin was calculated to be 2.03%.

[0027] (4) Raise the...

Embodiment 3

[0029] (1) Evenly mix 10kg of natural graphite with an average particle size of 16μm and 1.0kg of coal-based pitch powder, 2 / Under stirring state, the temperature was raised to 550°C at 5°C / min, and the temperature was kept constant for 2h. Take out after natural cooling, in N 2 Under protection, the temperature was raised to 1100°C at 5°C / min and kept at a constant temperature for 1h, and after natural cooling, modified graphite A was obtained by classification.

[0030] (2) Add 10.37 kg of the obtained A powder into 50 L of water-soluble thermosetting phenolic resin solution with a concentration of 0.1 kg / L, and stir at 90° C. for 1 h to obtain solution B.

[0031] (3) Solution B was filtered and dried, rapidly heated to 150°C and kept at a constant temperature for 10 minutes, and cooled to room temperature to obtain precursor powder, which weighed 10.56kg, and the coating amount of water-soluble thermosetting phenolic resin was calculated to be 1.83%.

[0032] (4) Raise ...

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Abstract

The invention discloses a preparation method of a modified lithium ion battery graphite cathode material. Graphite and asphalt are crushed and mixed to obtain asphalt coated graphite precursor powder after heat treatment, and the asphalt coated graphite precursor powder is subjected to high-temperature heat treatment, natural cooling and then classification under protection of N2 to obtain modified graphite A. Water-soluble thermosetting phenol resin is diluted and heated, the modified graphite A is added into the resin, and the modified graphite A and the resin are sufficiently stirred to obtain solution B. The solution B is filtered, dried, cured, carbonized and classified to obtain the modified lithium ion battery graphite cathode material. Raw materials are cheap and easy to get, the preparation method is simple in process, mild in condition, convenient in operation and high in safety, the prepared material is excellent and stable, and performance parameter range is wide and easily controlled. The material has an application prospect in the field of electronic products, power vehicles, solar and wind power generation and the like.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a method for preparing a modified lithium-ion battery graphite negative electrode material. Background technique [0002] Compared with traditional batteries such as nickel-metal hydride and lead-acid, lithium-ion secondary batteries have the advantages of high energy density, high output voltage, low self-discharge rate, environmental friendliness, no memory effect, long life, etc., and have been widely used in portable electronic products And consumer electronics, and has shown great application prospects in electric vehicles, solar and wind power generation equipment. [0003] As one of the determinants of the comprehensive electrochemical performance of lithium-ion secondary batteries, the negative electrode material is usually the main reason for the degradation of battery capacity and cycle performance. Therefore, it is of great significance to develop a high-capacity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205H01M4/587
CPCY02E60/10Y02P20/133
Inventor 陈然乔永民夏圣安李慧
Owner SHANGHAI SHANSHAN TECH CO LTD
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