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High energy density graphite negative electrode material and its preparation method of single particle and secondary particle mixture

A technology with high energy density and secondary particles, which is applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of negative electrode material tap density, discharge capacity, primary efficiency, and secondary compaction of pole pieces to be further improved, reaching Good cycle performance, reduced rebound, and simple preparation method

Active Publication Date: 2021-04-27
石家庄尚太科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • High energy density graphite negative electrode material and its preparation method of single particle and secondary particle mixture

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Embodiment 1

[0025] The present embodiment provides a preparation method of a single particle and a secondary particle mixed high energy density graphite negative electrode material, comprising the following steps:

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

[0027] (2) the coarse powder obtained in step (1) is finely ground and shaped 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 a 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 under the protection of nitrogen gas, carry out surface modification treatment at 300° C. for 8 hours to obtain a secondary D50 particle size value of 18 μm. p...

Embodiment 2

[0033] The present embodiment provides a preparation method of a single particle and a secondary particle mixed high energy density graphite negative electrode material, comprising the following steps:

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

[0035] (2) the coarse powder obtained in step (1) is finely ground and shaped 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 a 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 under the protection of nitrogen gas, carry out surface modification treatment at 600° C. for 16 hours to obtain a secondary D50 particle size value of 30 μm....

Embodiment 3

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

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

[0043] (2) the coarse powder obtained in step (1) is finely ground and shaped 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 under nitrogen gas protection, carry out surface modification treatment at 300° C. for 16 hours to obtain a secondary D50 particle size value of 18 μm. pa...

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Abstract

The invention relates to a high-energy-density graphite negative electrode material mixed with single particles and secondary particles and a preparation method thereof. The preparation method comprises: first crushing and drying artificial graphite raw materials to obtain coarse powder; finely grinding the coarse powder, Shaping to obtain fine powder; subject the fine powder to high-temperature graphitization treatment to obtain a single particle graphitized material; mix the fine powder with a binder, and perform surface modification treatment under the protection of an inert gas to obtain secondary particles; Particles are fused and granulated to obtain fusion materials, and then high-temperature graphitization treatment is performed to obtain secondary particle graphitized materials; single-particle graphitized materials and secondary particle graphitized materials are mixed to obtain lithium-ion batteries Negative material. It has been determined that the high-energy-density graphite negative electrode material has excellent performance in terms of tap density, discharge capacity, primary efficiency, and secondary compaction of pole pieces.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for lithium ion batteries, and in particular relates to a graphite negative electrode material with high energy density 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. Therefore, it is widely used. Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, electrolytes, and separators. As one of the key materials of lithium battery, the technology of negative electrode material has become a research hotspot. [0003] However, at present, the indicators such as tap density, discharge capacity, primary efficiency and secondary compaction of the anode material still need to be further improved. SUMMARY OF THE INVENTION [0004] I...

Claims

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Application Information

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Patent Type & Authority Patents(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