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Method for preparing lithium ion battery negative electrode by natural graphite

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor compatibility, poor cycle performance, high irreversible capacity electrolyte, etc., and achieve complete and excellent graphite coating Effect of performance, cycle performance improvement

Inactive Publication Date: 2019-05-21
原东
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, when natural graphite is used as the anode material of lithium-ion batteries, the inherent defects of high irreversible capacity and poor electrolyte compatibility limit the application of natural graphite in lithium-ion batteries.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0008] A kind of natural graphite of the present embodiment prepares the method for negative electrode material of lithium ion battery, comprises the following steps: (1) selects graphite powder and thermoplastic liquid polyvinyl alcohol as raw material with purity more than 99%, mixes polyvinyl alcohol and graphite according to 1: The proportion of 1 is mixed evenly in ethanol, and the solid content of the liquid polyvinyl alcohol is 60%; (2) the slurry obtained by mixing is sprayed into the air flow with a temperature of 150° C. to disperse it into tiny particles, and the liquid resin A solid resin layer is formed to coat the surface of the graphite powder; (3) After the resin-coated graphite powder is cured by acid catalysis, it is carbonized at a temperature of 1000 ° C, and the carbonization process is protected by flowing nitrogen.

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Abstract

The invention discloses a method for preparing a lithium ion battery negative electrode by natural graphite. The method comprises the steps of selecting graphite powder with purity being 99% or aboveand thermoplastic liquid-state polyvinyl alcohol as raw materials, and uniformly mixing the polyvinyl alcohol and the graphite in ethyl alcohol according to a proportion being 1:1, wherein the solid content of the liquid-state polyvinyl alcohol accounts for 60%; spraying paste obtained by mixing into airflow with a temperature being 150 DEG C so that paste is dispersed to form tiny particles, wherein a liquid-state resin layer forms a solid-state resin layer to coat a surface of graphene micropowder; and performing carbonization under a temperature condition of 1,000 DEG C after acid catalyticcuring on the resin coated graphite powder, wherein flowing nitrogen protection is employed during the carbonization process. Pyrolytic carbon-coated graphite micropowder having a core-shell structure is prepared by a mixing and dispersing method to obtain a complete and uniform graphite-coated layer, so that the cycle property of the graphite powder can be relatively improved, and the coated graphite has excellent performance when applied to a lithium ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of graphite materials for lithium ion batteries, and in particular relates to a method for preparing negative electrode materials of lithium ion batteries from natural graphite. Background technique [0002] Graphite, as an anode material for lithium-ion batteries, has a high reversible capacity and a low charge-discharge platform for lithium, so it has been extensively researched and developed. Natural graphite powder has a high degree of graphitization and is composed of crystallites with different orientations, and the orientation of the crystallites is anisotropic. The grain boundaries between the crystallites are easy to absorb the deformation energy caused by the intercalation and migration of lithium ions. structural stability and cycle performance. However, when natural graphite is used as the anode material of lithium-ion batteries, the inherent defects of high irreversible capacity and poor electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCY02E60/10
Inventor 原东
Owner 原东
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