Modified silicon monoxide material for lithium ion battery negative electrode and preparation method thereof

A silicon monoxide and lithium battery technology, applied in silicon oxide, electrode manufacturing, silicon dioxide, etc., can solve the problems of low initial coulombic efficiency, uneven dispersion, stability, poor cycle performance of lithium batteries, etc., to improve coulombic efficiency , Improving electrochemical performance and reducing the effect of the first irreversible capacity

Active Publication Date: 2020-04-28
JIANGXI IAMETAL NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that when the existing lithium battery negative electrode material is mixed with silicate, the dispersion is not uniform and stable enough, which leads to poor cycle performance and low initial coulombic efficiency of the lithium battery, and provides a lithium ion battery negative electrode. Modified silicon monoxide material and preparation method thereof

Method used

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  • Modified silicon monoxide material for lithium ion battery negative electrode and preparation method thereof
  • Modified silicon monoxide material for lithium ion battery negative electrode and preparation method thereof
  • Modified silicon monoxide material for lithium ion battery negative electrode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] (1) Combine 8.225kg silicon powder, 8.625kg silicon dioxide and 5kg MgSiO 3 Powder, 2kg Li 2 Si 2 O 5 The powder and 95L of water were added to the ball mill and milled at 600r / min for 3h to obtain a slurry with a solid content of about 20%. Then the slurry was spray-dried to form raw material microspheres with uniformly distributed components. The raw material microspheres are compressed into a block using a hydraulic forming machine, and then dried in a vacuum oven at 60°C for 3 hours, and dried to obtain a raw material block;

[0051] (2) Load the compressed raw material block into the heating zone of the silicon monoxide preparation equipment, draw the vacuum to around 5Pa and start heating at a heating rate of 50°C per minute. After heating to 1300°C, keep it for 20 hours while maintaining the collection area The temperature is 500℃, and then it is cooled to room temperature, the deposited bulk material is taken out, and the jaw crusher crushes it to coarse particles o...

Embodiment 2

[0059] Other operations are the same as in Example 1, the difference is that the amount of raw materials is changed to 7.5kg silicon powder, 10.5kg silicon dioxide and 5kgMgSiO 3 Powder and 90L water.

Embodiment 3

[0061] Other operations are the same as in Example 1, the difference is that the amount of raw materials is changed to 4.9kg silicon powder, 7.5kg silicon dioxide and 2.5kg Li 2 Si 2 O 5 Powder and 60L water.

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Abstract

The invention discloses a modified silicon monoxide material and a preparation method thereof. The modified silicon monoxide material is the modified silicon monoxide material used for a lithium battery negative electrode. The modified silicon monoxide material is prepared by the following steps: reacting raw materials silicon, silicon dioxide and metal silicate under high-temperature and vacuum conditions to prepare silicon monoxide, and reacting metal steam with silicon monoxide in the preparation process to form metal silicate in situ; wherein the metal silicate is uniformly dispersed around the silicon and the silicon monoxide to form silicon-containing particles, and the carbon material is coated on the surfaces of the silicon-containing particles. The silicate in the modified siliconmonoxide material is uniformly dispersed, the carbon material is uniformly coated, and the modified silicon monoxide material shows high specific capacity, high initial coulombic efficiency, excellent cycle performance and rate capability when used as the lithium ion battery negative electrode material. Moreover, the preparation method disclosed by the invention is low in raw material price and beneficial to industrial implementation, so that the modified silicon monoxide has a very wide application prospect.

Description

Technical field [0001] The invention belongs to the technical field of batteries, and specifically relates to a modified silicon monoxide and a preparation method thereof, and a battery negative electrode and a lithium ion battery containing the modified silicon monoxide. Background technique: [0002] Since Sony's introduction to the market in 1991, lithium-ion batteries have become the most important energy storage equipment due to their high-quality energy density, high volumetric energy density, high power density, long cycle life and low self-discharge rate. . In addition to having very important applications in consumer electronics, such as notebook computers, mobile phones, and medical electronic equipment, lithium-ion batteries have also shown application advantages in the field of electric vehicles in recent years. They are a green alternative to non-renewable petroleum resources. Product. In addition, lithium-ion batteries are also ideal storage devices for intermitte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18C01B32/05H01M4/36H01M4/48H01M4/62H01M10/0525H01M4/02
CPCC01B33/182C01B32/05H01M4/366H01M4/48H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027C01P2004/80C01P2004/61C01P2002/72C01P2004/04C01P2004/03C01P2006/40Y02E60/10H01M4/0428
Inventor 赵岸光岳风树姚钧
Owner JIANGXI IAMETAL NEW ENERGY TECH CO LTD
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