Single-particle and secondary-particle mixed high-energy-density graphite negative electrode material and preparation method thereof

A technology with high energy density and secondary particles, which is applied to battery electrodes, electrical components, circuits, etc., can solve the problems of negative electrode material tap density, discharge capacity, primary efficiency, and secondary compaction of the pole piece to be further improved, and achieve good Effects of cycle performance, improvement of processing performance, and simple production method

Active Publication Date: 2020-01-03
石家庄尚太科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current tap density, discharge capacity, initial efficiency, and secondary compaction of the anode material still need to be further improved.

Method used

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  • Single-particle and secondary-particle mixed high-energy-density graphite negative electrode material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment provides a kind of single particle, the preparation method of the high energy density graphite negative electrode material that secondary particle mixes, comprises the following steps:

[0026] (1) first crush the petroleum coke, and dry it in a drier with a temperature of 100°C and a rotation speed of 10r / min for 0.5h to obtain a coarse powder with a particle size of less than 1.8mm;

[0027] (2) Finely grinding and shaping the coarse powder obtained in step (1) to obtain a fine powder with a D50 particle size value of 6.5 μm;

[0028] (3) subjecting the fine powder obtained in step (2) to high-temperature graphitization treatment at 2400° C. for 24 hours to obtain a single-particle graphitized material;

[0029] (4) Mix the fine powder obtained in step (2) with asphalt in a weight ratio of 100:8, and carry out surface modification treatment at 300°C for 8 hours under the protection of nitrogen gas to obtain a secondary particles;

[0030] (5) The sec...

Embodiment 2

[0033] This embodiment provides a kind of single particle, the preparation method of the high energy density graphite negative electrode material that secondary particle mixes, comprises the following steps:

[0034] (1) First crush the pitch coke and dry it in a dryer at a temperature of 300°C and a rotation speed of 20r / min for 3 hours to obtain a coarse powder with a particle size of less than 1.5mm;

[0035] (2) Finely grinding and shaping the coarse powder obtained in step (1) to obtain a fine powder with a D50 particle size value of 12.5 μm;

[0036] (3) subjecting the fine powder obtained in step (2) to high-temperature graphitization treatment at 3000° C. for 48 hours to obtain a single-particle graphitized material;

[0037] (4) Mix the fine powder obtained in step (2) with asphalt in a weight ratio of 100:12, and carry out surface modification treatment at 600°C for 16 hours under the protection of nitrogen gas to obtain a secondary particles;

[0038] (5) The seco...

Embodiment 3

[0041] This embodiment provides a method for preparing a high energy density graphite negative electrode material mixed with single particles and secondary particles, comprising the following steps:

[0042] (1) first crush the needle coke, and dry it in a drier with a temperature of 100°C and a rotation speed of 10r / min for 3 hours to obtain a coarse powder with a particle size of less than 2mm;

[0043] (2) Finely grinding and shaping the coarse powder obtained in step (1) to obtain a fine powder with a D50 particle size value of 6.5 μm;

[0044] (3) subjecting the fine powder obtained in step (2) to a high-temperature graphitization treatment at 2400° C. for 48 hours to obtain a single-particle graphitized material;

[0045] (4) Mix the fine powder obtained in step (2) with asphalt in a weight ratio of 100:8, and carry out surface modification treatment at 300°C for 16 hours under the protection of nitrogen gas to obtain a secondary powder with a D50 particle size of 18 μm ...

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Abstract

The invention relates to a single-particle and secondary-particle mixed high-energy-density graphite negative electrode material and a preparation method thereof.The preparation method comprises the steps of crushing and drying an artificial graphite raw material to obtain coarse powder, finely grinding and shaping the coarse powder to obtain fine powder, performing high-temperature graphitizationtreatment on the fine powder to obtain a single-particle graphitized material, mixing the fine powder with a binder carrying out surface modification treatment under the protection of an inert gas toobtain secondary particles, carrying out fusion granulation treatment on the secondary particles to obtain a fusion material and then carrying out high-temperature graphitization treatment to obtaina secondary particle graphitized material, and mixing the single-particle graphitized material with the secondary-particle graphitized material to obtain a lithium ion battery negative electrode material. Through measurement, the high-energy-density graphite negative electrode material has excellent performances in the aspects of tap density, discharge capacity, first efficiency, secondary compaction of a pole piece and other indexes.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for lithium ion batteries, and in particular relates to a high-energy-density graphite negative electrode material mixed with single particles and secondary particles and a preparation method thereof. Background technique [0002] As a secondary battery of green new energy, lithium-ion battery has high working voltage, long cycle life and fast charging and discharging speed, so it is widely used. Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, electrolytes, and separators. Negative electrode material is one of the key materials of lithium batteries, and its technology has become a research hotspot. [0003] However, the tap density, discharge capacity, initial efficiency and secondary compaction of the anode material still need to be further improved. Contents of the invention [0004] In order to solve the problems in the pri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCH01M4/38Y02E60/10
Inventor 安静许晓落刘尚吴琪吴浩腰晓甫
Owner 石家庄尚太科技股份有限公司
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