Production method of high-compaction fast-charging type lithium ion battery negative electrode material

A technology for lithium-ion batteries and anode materials, applied to battery electrodes, circuits, electrical components, etc., to achieve the effects of avoiding accumulation, increasing compaction density, and improving coating uniformity

Pending Publication Date: 2021-12-07
大连宏光锂业有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patent document CN112490443A discloses a graphite negative electrode material coated in a liquid phase. The liquid phase coating is obtained by mixing a graphitized petroleum coke product with a liquid phenolic resin and then carbonizing it. A pyrolytic carbon layer, but it only modifies a part of graphite defects and needs to be further improved

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  • Production method of high-compaction fast-charging type lithium ion battery negative electrode material

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Embodiment 1

[0029] This embodiment provides a method for producing a negative electrode material of a high-pressure compacted and fast-charged lithium-ion battery, comprising the following steps:

[0030] (1) Coarsely pulverize and finely pulverize petroleum coke raw materials, and then perform spheroidization, shaping and classification to obtain graphite raw material powder with D50 particle size value of 6 μm;

[0031] (2) Mix the raw material powder obtained in step (1) with the petroleum asphalt binder according to the ratio of 95:5, and the mixing time is 2 hours to obtain the mixture 1,

[0032] (3) The mixed powder 1 obtained in step (2) was chemically modified in a coating kettle under the protection of inert gas nitrogen. The modification temperature was 550°C, and the treatment time was 10 hours. The D50 particle size value was 16 μm. secondary particles;

[0033] (4) Mix the secondary particles obtained in step (3) with the phenolic resin according to the ratio of 98:2, and t...

Embodiment 2

[0040] This embodiment provides a method for producing a negative electrode material of a high-pressure compacted and fast-charged lithium-ion battery, comprising the following steps:

[0041] (1) The needle coke raw coke is coarsely crushed and finely crushed, and then spheroidized, shaped and classified to obtain a graphite raw material powder with a D50 particle size of 8 μm;

[0042] (2) Mix the raw material powder obtained in step (1) with the petroleum asphalt binder according to the ratio of 90:10, and the mixing time is 2 hours to obtain the mixture 1,

[0043] (3) The mixed powder 1 obtained in step (2) was chemically modified in a coating kettle under the protection of inert gas nitrogen. The modification temperature was 650°C, and the treatment time was 8 hours. The D50 particle size value was 15 μm. secondary particles;

[0044] (4) Mix the secondary particles obtained in step (3) with the phenolic resin according to the ratio of 97:3, and the mixing time is 4 hou...

Embodiment 3

[0051] This embodiment provides a method for producing a negative electrode material of a high-pressure compacted and fast-charged lithium-ion battery, comprising the following steps:

[0052] (1) The calcined needle coke is coarsely crushed and finely crushed, and then spheroidized, shaped and classified to obtain graphite raw material powder with a D50 particle size of 8.5 μm;

[0053] (2) Mix the raw material powder obtained in step (1) with the petroleum asphalt binder according to the ratio of 85:15, and the mixing time is 2 hours to obtain the mixture 1,

[0054] (3) The mixed powder 1 obtained in step (2) was chemically modified in a coating kettle under the protection of inert gas nitrogen. The modification temperature was 700°C, and the treatment time was 8 hours. The D50 particle size value was 18 μm. secondary particles;

[0055] (4) Mix the secondary particles obtained in step (3) with the phenolic resin according to the ratio of 95:5, and the mixing time is 5 hours...

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Abstract

The invention relates to a production method of a high-compaction quick-charge type lithium ion battery negative electrode material. The production method comprises the following steps: mixing an artificial graphite raw material and a binder according to a certain ratio to obtain a mixture 1; under the protection of inert gas, carrying out chemical modification treatment to obtain secondary particles; mixing with a hard carbon coating agent to obtain a mixture 2; carrying out low-temperature curing treatment to obtain a hard carbon coated secondary particle precursor; performing high-temperature graphitization treatment to obtain a graphitized product precursor; mixing with a liquid coating agent, and then carrying out spray drying to obtain a spray-dried precursor; and performing carbonization treatment under the protection of inert gas to obtain the lithium ion battery negative electrode material. The prepared lithium ion battery negative electrode material has the characteristics of low specific surface area, high compaction density, high initial efficiency and good charging performance.

Description

technical field [0001] The invention relates to a production method of a high-pressure compacted and fast-charged lithium-ion battery negative electrode material, belonging to the technical field of lithium-ion battery negative electrode materials. Background technique [0002] Under the background of the country's large energy development strategy, lithium-ion batteries have the advantages of high energy density, small size, good cycle stability, no memory effect, and good safety performance, and are widely used. With the strong support of national policies and the continuous improvement and increase of people's living standards, higher requirements are put forward for lithium-ion batteries: higher capacity, longer cycle life, and faster charging speed. [0003] Graphite, as an important part of lithium-ion batteries, directly affects the performance of batteries. At present, due to its small interlayer spacing, graphite seriously affects the fast charging performance of li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/625H01M4/36Y02E60/10
Inventor 王庆成韩团辉宋爽
Owner 大连宏光锂业有限责任公司
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