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Oxidation modification method of graphite negative electrode material, graphite negative electrode material and lithium ion battery

A graphite negative electrode and oxidation modification technology, which is applied in the direction of graphite, battery electrodes, secondary batteries, etc., can solve the problems of unsatisfactory improvement of graphite conductivity, cycle performance, difficult operation control, and poor process stability, etc., to achieve excellent electricity Chemical properties, ease of control, and high production efficiency

Inactive Publication Date: 2017-12-19
NORTHERN ALTAIR NANOTECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing oxidation modification method mainly uses oxidants such as concentrated sulfuric acid and nitric acid to modify graphite, which has the disadvantages of cumbersome follow-up treatment, difficult operation control, low oxidation efficiency, poor process stability, and the conductivity and cycle of graphite. Defects such as unsatisfactory performance improvement effect

Method used

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  • Oxidation modification method of graphite negative electrode material, graphite negative electrode material and lithium ion battery
  • Oxidation modification method of graphite negative electrode material, graphite negative electrode material and lithium ion battery
  • Oxidation modification method of graphite negative electrode material, graphite negative electrode material and lithium ion battery

Examples

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Effect test

Embodiment 1

[0099] A method for oxidation modification of a graphite negative electrode material, comprising the following steps:

[0100] Weigh the natural graphite and liquid bromine according to the mass ratio of 1:4, put them in a sealed container, stir at a constant temperature of 30°C and a constant speed of 400r / min for 4 hours; wash with a 75% ethanol solution 3 times; filter the mixed solution after washing, add water continuously to neutralize during the filtration process, stop filtering until the pH value of the solution is 6.8; dry the filtered sample at 90°C to obtain the intermediate ;

[0101] The intermediate is calcined for 4 hours in an argon protective atmosphere at a temperature of 800° C.; ground to obtain a graphite negative electrode material.

Embodiment 2

[0103] A method for oxidation modification of a graphite negative electrode material, comprising the following steps:

[0104] Weigh the natural graphite and liquid bromine according to the mass ratio of 1:8, put them in a sealed container, stir at a constant temperature of 55°C and a constant speed of 500r / min for 5 hours; wash with 95% ethanol solution 3 times; filter the mixed solution after washing, add water continuously to neutralize during the filtration process, stop filtering until the pH value of the solution is 7; dry the filtered sample at 95°C to obtain the intermediate ;

[0105] The intermediate is calcined for 3 hours in a helium protective atmosphere at a temperature of 850° C.; ground to obtain a graphite negative electrode material.

Embodiment 3

[0107] A method for oxidation modification of a graphite negative electrode material, comprising the following steps:

[0108] (a) Mixing and stirring: Weigh the natural spherical graphite and liquid bromine according to the mass ratio of 1:6, and put them in a sealed tank, and put the sealed tank on a magnetic stirrer with a constant temperature of 40°C and a constant speed of 450r / Min stirred for 6 hours;

[0109] (b) washing: first use the redundant liquid bromine gas that the basic aluminum oxide adsorbent absorbs to volatilize, and then wash 4 times with the ethanol solution that concentration is 80%;

[0110] (c) Filtration: filter by suction filtration, add water continuously to neutralize the mixed solution after washing in the suction filtration process, until the pH value of the solution is 7, stop the suction filtration;

[0111] (d) drying: the filtered sample is dried in a blast drying oven at a drying temperature of 100° C. to obtain an intermediate;

[0112] ...

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Abstract

The invention belongs to the technical field of a lithium ion battery, and relates to an oxidation modification method of a graphite negative electrode material, the graphite negative electrode material and a lithium ion battery. The oxidation modification method of the graphite negative electrode material comprises the following steps: mixing a graphite matrix material and liquid bromine uniformly and performing oxidation modification on the graphite matrix material to obtain an intermediate; calcining and grinding the intermediate to obtain the graphite negative electrode material. The graphite is subjected to oxidation modification treatment by taking efficient liquid bromine as an oxidizing agent, so that the electric conductivity and the cycling stability of the graphite material can be effectively improved; moreover, the method is convenient in production operation and easy to control.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an oxidation modification method of a graphite negative electrode material, a graphite negative electrode material and a lithium ion battery. Background technique [0002] In the existing secondary battery system, lithium-ion batteries are currently the most competitive secondary batteries in terms of development space and technical indicators such as life, specific energy, working voltage and self-discharge rate. With the continuous development of electronic technology, higher requirements are put forward for lithium-ion batteries, which require higher energy density, better cycle life, better high and low temperature charge and discharge performance and safety performance, etc., which requires lithium The cathode and anode materials for ion batteries need to be further developed and improved. [0003] Because graphite has the advantages of abundant re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/23H01M4/587H01M10/0525
CPCH01M4/587H01M10/0525Y02E60/10
Inventor 杨王科白岩成信刚马书良
Owner NORTHERN ALTAIR NANOTECH CO LTD
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