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A kind of composite graphite negative electrode material and preparation method thereof

A technology of composite graphite and negative electrode materials, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve problems such as poor compatibility, poor cycle performance, and low capacity

Active Publication Date: 2021-07-30
INNER MONGOLIA SANXIN NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural graphite has undergone processes such as spheroidization and surface modification, and has the characteristics of low cost and high gram capacity, but its compatibility with electrolyte is poor, and the cycle expansion rate is high, and the cycle performance is poor; traditional MCMB has good Excellent cycle performance, but its capacity is low, unable to meet the market demand for high energy density batteries; artificial graphite has better compatibility with electrolyte, long cycle life, and better overall performance, but compared with natural graphite, its low capacity

Method used

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  • A kind of composite graphite negative electrode material and preparation method thereof
  • A kind of composite graphite negative electrode material and preparation method thereof
  • A kind of composite graphite negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The small micron composite graphite negative electrode material of this embodiment is prepared by the following steps:

[0025] 1) Add 200kg of natural flake graphite (D50 is 4-6μm) and 30kg of petroleum pitch (2-3μm) into a mixer for mixing for 30 minutes.

[0026] 2) Transfer the mixed raw materials to a drum furnace, under the protection of nitrogen, granulate at 600°C for 3.5 hours, and discharge after cooling down to room temperature.

[0027] 3) The granulated material is graphitized at 3000° C. under the protection of nitrogen, and the graphitization time is 50 hours.

[0028] 4) Sieve the graphitized material, the sieve is 250 mesh, and the D50 of the obtained finished product is 10.2 μm.

[0029] The lithium-ion battery of this embodiment is prepared by adding the small-micron composite graphite negative electrode material of this embodiment, conductive agents SP, CMC, and SBR (solid content 50%) according to the mass ratio of 95.5:1:1.5:2, and adding deionize...

Embodiment 2

[0031] The small micron composite graphite negative electrode material of this embodiment is prepared by the following steps:

[0032] 1) Add 200kg of natural flake graphite (D50 is 4-6μm) and 50kg of petroleum pitch (5-6μm) into a mixer for mixing for 45min.

[0033] 2) Transfer the mixed raw materials to a drum furnace, under the protection of nitrogen, granulate at 500°C for 5 hours, and discharge after cooling down to room temperature.

[0034] 3) The granulated material is graphitized at 2700° C. under the protection of nitrogen, and the graphitization time is 70 hours.

[0035] 4) Sieve the graphitized material, the sieve is 250 mesh, and the D50 of the obtained finished product is 12.4 μm.

[0036] The specific implementation method of the lithium-ion battery in this example is the same as that of Example 1. The first discharge specific capacity of the obtained button-down battery is 384.7mAh / g, the first charge specific capacity is 362.3mAh / g, and the first effect is ...

Embodiment 3

[0038] The small micron composite graphite negative electrode material of this embodiment is prepared by the following steps:

[0039] 1) 200kg of natural flake graphite (D50 is 4-6μm) and 50kg of coal tar pitch (8-9μm) are added to the mixer for mixing, and the mixing time is 90min.

[0040] 2) Transfer the mixed raw materials to a vertical reactor, under the protection of nitrogen, granulate at 700°C for 4.5 hours, and discharge after cooling down to room temperature.

[0041] 3) The granulated material is graphitized at 2900° C. under the protection of nitrogen, and the graphitization time is 45 hours.

[0042] 4) Sieve the graphitized material, the sieve is 250 mesh, and the D50 of the obtained finished product is 11.7 μm.

[0043] The specific implementation method of the lithium-ion battery in this example is the same as that of Example 1. The first discharge specific capacity of the prepared button-down battery is 385.5mAh / g, the first charge specific capacity is 365.8...

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Abstract

The invention discloses a preparation method of a composite graphite negative electrode material. The method is completed by the following steps: (1) mixing flake natural graphite with pitch; (2) granulation; (3) graphitization; (4) product classification. The flake natural graphite used in the present invention is a graphite product with high ash content, has wide source of raw materials, low cost, and simple and easy preparation method.

Description

technical field [0001] The invention belongs to the field of lithium ion battery electrode materials, and in particular relates to a composite graphite negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a high-performance rechargeable battery, which has broad application prospects in many fields such as 3C products, power vehicles, space technology and national defense industry. Lithium-ion batteries have performance advantages such as high energy density, wide operating voltage window, long cycle life, and fast charge and discharge, and have become a research hotspot in recent years. With the development of lithium-ion battery technology, various industries have higher and higher requirements for lithium-ion performance. Among them, long cycle, high rate, fast charge and discharge, and high energy density are all research workers and lithium battery manufacturers and manufacturers. focus of attention. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/587H01M10/0525
CPCH01M4/362H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 王志国万水田
Owner INNER MONGOLIA SANXIN NEW MATERIAL TECH CO LTD