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Silicon monoxide-based negative electrode material with high reversible capacity, preparation and application thereof

A silicon oxide-based, silicon oxide technology, applied in nanotechnology, battery electrodes, electrochemical generators, etc. for materials and surface science, can solve problems such as limited refinement effect, prevent agglomeration effect, Good uniformity and improved electrochemical performance

Active Publication Date: 2021-04-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of purely relying on the refinement of ball milling is limited.

Method used

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  • Silicon monoxide-based negative electrode material with high reversible capacity, preparation and application thereof
  • Silicon monoxide-based negative electrode material with high reversible capacity, preparation and application thereof
  • Silicon monoxide-based negative electrode material with high reversible capacity, preparation and application thereof

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preparation example Construction

[0054]The present invention also provides a method for preparing a highly reversible capacity of a silicon oxide negative electrode material comprising the step of: ball milling of the raw material or the raw material and the engaging agent to obtain a silicon oxide compound negative electrode material.

[0055]The raw materials include silicon oxide and tin flour, cobalt powder; or silicon oxide, tin powder, cobalt powder, and carbon material. When the raw material does not contain carbon material, the joining agent is added, the maunder is graphite or ethanol; the amount of the coating agent is from 3% to 6% of the total mass of the raw material. When the raw material contains a carbon material, no engraguing agent or add liquid engagement agent; the liquid engagement agent is ethanol, the amount of the liquid carrier is 3% to 6% of the total mass of the raw material, at which time the material is silicon oxide , Tin powder, cobalt powder and carbon material.

[0056]The present inventi...

Embodiment 1

[0070]The method of preparing the SiO-Sn-Co composite (i.e., a silicon oxide negative electrode material having a highly reversible capacity), comprising the steps of:

[0071]Mixed silicon oxide, tin powder and cobalt powder, wherein the mass ratio of silicon oxide, tin powder and cobalt powder is 7: 2: 1, and anhydrous ethanol which is 3% of the total mass of the raw material. Ball mill, wherein the mass ratio of the mill and the raw material powder is 25: 1, the ball milling time is 2 h; obtaining a SiO-Sn-Co composite, i.e., a silicon oxide negative electrode material having a powder scale of less than 10 μm.

[0072]The specific steps of the ramp ball mill are as follows:

[0073](1) Mounting grinding balls and mixing materials in the ball mill (pure silicon oxide, tin powder, cobalt powder and noqueous ethanol);

[0074](2) The canister is surrounded by argon, so that the atmosphere in the can is argon;

[0075](3) Turn on the ball mill power, set the ball mill as "two-way operation, timing ...

Embodiment 2

[0081]The preparation method of the SiO-Sn-CO composite (i.e., a silicon oxide negative electrode material having a highly reversible capacity) is the same as in Example 1, and the ball mill is 4 h (one-way operating time is 30 min, Stop running time is 30 min, the number of runs is 8 times).

[0082]Figure 4 A backnaming SEM diagram of the SiO-Sn-CO based negative electrode material prepared by the present embodiment, as shown, the ball mill is a secondary particle composed of size particles, wherein the sub-Co alloy compound (bright area) is closely sticked. Attached or embedded in large SiO particles. In this structure, tin cobalt phase can be used as an electron / ion transport passage of the silica particles, which is advantageous for embedding and extraction of lithium ions in the particles.

[0083]Figure 5 The voltage-normalized capacity curve of the SiO-Sn-Co composite negative electrode prepared according to the present embodiment, as shown in the figure, a pure SiO negative ele...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and discloses a silicon monoxide-based negative electrode material with high reversible capacity, preparation and application thereof. The silicon monoxide-based negative electrode material is mainly prepared from raw materials in a ball milling manner. When the raw materials are silicon monoxide, tin powder and cobalt powder, the silicon monoxide accounts for 30-70% of the total mass of the raw materials, the Sn powder accounts for 10-50% of the total mass of the raw materials, and the Co powder accounts for 5-25% of the total mass of the raw materials; when the raw materials are silicon monoxide, tin powder, cobalt powder and a carbon material, the silicon monoxide accounts for 40-70% of the total mass of the raw materials, the tin powder accounts for 10%-30% of the total mass of the raw materials, the cobalt powder accounts for 5%-15% of the total mass of the raw materials, and the carbon material accounts for 5-30% of the total mass of the raw materials. The invention also discloses a preparation method of the silicon monoxide-based negative electrode material. The negative electrode material disclosed by the invention has high reversible capacity, relatively good initial coulombic efficiency and excellent cycling stability. The negative electrode material is used for preparing a lithium ion battery.

Description

Technical field[0001]The present invention belongs to the field of lithium ion battery manufacturing, and more particularly to a silicon oxide-based negative electrode material and a preparation method thereof. The negative electrode material is used as an electrode material of a lithium ion battery.Background technique[0002]The rapid development and popularization of various electronic equipment and electric vehicles, which puts higher requirements for lithium-ion batteries in energy storage capacity, energy density, cycle life, cost, safety, etc. However, currently commercial lithium-ion battery negative electrode materials cannot meet more and more larger energy storage equipment and longer battery requirements due to their own theory, and therefore developing high-capacity negative electrode materials have It is important.[0003]Silicon hydrogen oxide is a wide range of research and emphasis on high cost due to high atrial specific capacity (~ 1600 mAh / g), low cost, and moderat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/362H01M4/483H01M4/62H01M4/626H01M4/628H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 胡仁宗杜星阳张涵茵鲁忠臣朱敏
Owner SOUTH CHINA UNIV OF TECH
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