Anode material with core-shell structure and manufacture method thereof

A negative electrode material and core-shell structure technology, applied in structural parts, battery electrodes, electrical components, etc., can solve the problems of capacity fading, volume change cannot form a stable solid electrolyte film, hinder large-scale commercial application, etc., to improve electrical conductivity performance, excellent rate capability and cycle stability, excellent electrochemical performance and cycle stability

Inactive Publication Date: 2019-06-07
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon has a huge volume change in the process of lithium removal and intercalation, and the surface cannot form a stable solid electrolyte film, resulting in rapid capacity decay with cycling and low Coulombic efficiency, which seriously hinders its large-scale commercial application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides an alumina / silicon-carbon composite negative electrode material with a core-shell structure, which is prepared by the following steps:

[0034] (1) Ingredients

[0035] According to chitosan: water is the mass ratio of 0.5:100, acetic acid: water is the mass ratio of 0.5:100, get chitosan, acetic acid, water and mix and be formulated with chitosan-acetic acid-water solution;

[0036] (2) Preparation of core-shell silicon structure

[0037] According to the mass ratio of silicon material: chitosan-acetic acid-water solution of 0.5:1, and the mass ratio of silicon material: alumina powder of 1:5, silicon material and alumina powder are taken; wherein the silicon material is silicon oxide , the alumina powder is nano-scale α-alumina powder with a purity of 99.99%; mix and stir the silicon material, chitosan-acetic acid-water solution evenly, so that the surface of the silicon material is evenly coated with a layer of chitosan-acetic acid- water s...

Embodiment 2

[0047] This embodiment provides an alumina / silicon-carbon composite negative electrode material with a core-shell structure, which is prepared by the following steps:

[0048] (1) Ingredients

[0049] By chitosan: water is the mass ratio of 2:100, acetic acid: water is the mass ratio of 5:100, get chitosan, acetic acid, water and mix and be formulated with chitosan-acetic acid-water solution;

[0050] (2) Preparation of core-shell silicon structure

[0051] According to the mass ratio of silicon material: chitosan-acetic acid-water solution of 1:1, and the mass ratio of silicon material: alumina powder of 1:10, silicon material and alumina powder are taken; wherein the silicon material is nano silicon powder ; Mix and stir the silicon material, chitosan-acetic acid-water solution evenly, so that the surface of the silicon material is evenly coated with a layer of chitosan-acetic acid-water solution; The aluminum powder is put into a ball mill for ball milling, rotated and co...

Embodiment 3

[0056] This embodiment provides an alumina / silicon-carbon composite negative electrode material with a core-shell structure, which is prepared by the following steps:

[0057] (1) Ingredients

[0058] By chitosan: water is the mass ratio of 5:100, acetic acid: water is the mass ratio of 2:100, get chitosan, acetic acid, water and mix and be formulated with chitosan-acetic acid-water solution;

[0059] (2) Preparation of core-shell silicon structure

[0060] According to the mass ratio of silicon material: chitosan-acetic acid-water solution of 2:1, and the mass ratio of silicon material: alumina powder of 1:10, silicon material and alumina powder are taken; wherein the silicon material is silicon oxide The mixture with nano-silica powder, the mass ratio of silicon oxide: nano-silica powder is 0.5:1. Mix and stir the silicon material, chitosan-acetic acid-water solution evenly, so that the surface of the silicon material is evenly coated with a layer of chitosan-acetic acid -...

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PUM

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Abstract

The invention provides an anode material with a core-shell structure and a manufacture method thereof. The anode material has the core-shell structure, wherein SiO and/or Si serves as a center core, acarbon material serves as a buffer layer, and an aluminum oxide material serves as a shell. The invention further provides a preparation method of the anode material. The anode material has high capacity retaining rate and good cyclic performance.

Description

technical field [0001] The invention relates to a negative electrode material of a lithium ion battery with a core-shell structure and a preparation method thereof, belonging to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion batteries have brought revolutionary changes to the field of energy storage since their birth, and are widely used in various in portable electronic devices and electric vehicles. However, with the improvement of people's living standards, higher user experience puts forward higher requirements for lithium-ion batteries: lighter weight, longer service life, etc.; in order to solve the above problems, it is necessary to find electrode materials with better performance. [0003] At present, the commercial lithium-ion anode material is mainly graphite, but its theoretical capacity is only 372mAh / g, which cannot meet the urgent needs of users. Therefore, the development of anode materials with higher specific capacit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525
CPCY02E60/10
Inventor 郭钰静樊少娟
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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