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Pre-lithiated silicon monoxide/carbon composite material and preparation method and application thereof

A technology of carbon composite materials and silicon oxide, which is applied in the direction of electrochemical generators, active material electrodes, electrical components, etc., can solve the problems of difficult cycle performance, low electrical conductivity, and low initial Coulombic efficiency, and achieve excellent performance and improved The effect of conductivity and broad application prospects

Inactive Publication Date: 2020-11-06
SHAANXI COAL & CHEM TECH INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of low initial coulombic efficiency, low electrical conductivity, and cycle performance of silicon oxide materials in the prior art, which are still difficult to achieve practical application, and provide a pre-lithiated silicon oxide / carbon composite material and its preparation method and application

Method used

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  • Pre-lithiated silicon monoxide/carbon composite material and preparation method and application thereof
  • Pre-lithiated silicon monoxide/carbon composite material and preparation method and application thereof
  • Pre-lithiated silicon monoxide/carbon composite material and preparation method and application thereof

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preparation example Construction

[0028] A kind of preparation method of pre-lithiated silicon oxide / carbon composite material of the present invention, comprises the following steps:

[0029] S1. Mix silicon oxide, lithium source, and endothermic agent evenly, perform heat treatment in an inert atmosphere, wash and filter;

[0030] S2. Put the above-mentioned obtained materials into a rotary kiln, heat up to a certain temperature and keep it warm, pass a certain amount of pyrolysis gas, and carry out carbon coating to obtain a pre-lithiated silicon oxide / carbon composite material

[0031] Preferably, the mass ratio of silicon oxide to lithium source in the step S1 is 1: (0.1-1), preferably, the mass ratio of silicon oxide to lithium source is 1: (0.2-0.5);

[0032] Preferably, the mass ratio of the lithium source to the endothermic agent in the step S1 is 1: (0.1-1), preferably, the mass ratio of the lithium source to the endothermic agent is 1: (0.5-1).

[0033] Preferably, the lithium source in the step S1...

Embodiment 1

[0042] A preparation and application of a pre-lithiated silicon oxide / carbon composite material, comprising the following steps:

[0043] 1) Weigh 100g of SiO, 20g of lithium hydroxide and 20g of sodium chloride in a ball milling jar, the rotation speed is 400rpm / min, and the ball milling time is 2h.

[0044] 2) Put the material obtained by ball milling into a corundum crucible, put it into a tube furnace, and raise the temperature to 600°C at 3°C / min under the protection of nitrogen, and keep it warm for 1h.

[0045] 3) After the heat preservation is completed, the obtained material is washed three times with deionized water to remove the heat-absorbing agent, and kept in a vacuum oven at 80° C. for 8 hours to remove water.

[0046] 4) Put the dried material into a rotary kiln, raise the temperature to 800° C., feed acetylene gas, and keep it warm for 1 hour to obtain a pre-lithiated silicon oxide / carbon composite material.

[0047] see figure 1 , it can be seen that the pa...

Embodiment 2

[0049] Compared with Example 1, sodium chloride and lithium hydroxide are not added in step 1, and all other step parameters remain unchanged.

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Abstract

The invention discloses a pre-lithiated silicon monoxide / carbon composite material and a preparation method and application thereof. The preparation method comprises: mixing silicon monoxide, a lithium source and a heat absorbing agent to be uniform, then conducting heat treatment, washing and filtering under the protective atmosphere, and obtaining a pre-lithiated product; and putting the pre-lithiated product into a rotary kiln, heating, introducing pyrolysis gas, and carrying out carbon coating by vapor deposition to obtain the pre-lithiated silicon monoxide / carbon composite material. The method is simple to operate, low in cost, free of difficult-to-control steps and suitable for amplification. The obtained composite material has a core-shell structure, the core material contains at least one of lithium silicate and lithium metasilicate sources, irreversible components in silicon monoxide can be effectively consumed, and the first effect is improved. The pyrolytic carbon on the outer layer can relieve volume expansion of silicon monoxide and improve the conductivity of the material. The material is used in the lithium ion battery, and the theoretical capacity and the first effect are improved to a certain extent.

Description

technical field [0001] The invention relates to the technical field of silicon oxide materials, in particular to a pre-lithiated silicon oxide / carbon composite material and its preparation method and application. Background technique [0002] Graphite is a cheap and stable battery anode material, and it is currently the most widely commercialized anode material. However, the theoretical specific capacity of graphite is only 372mAh / g. In recent years, the capacity of commercial graphite has reached 355-360mAh / g, which is close to its theoretical specific capacity. It is difficult to have more room for improvement, especially with the development of electric vehicles. With vigorous development, batteries with graphite as the negative electrode have been difficult to meet people's battery life requirements. Silicon-based anode materials have attracted extensive attention due to their high capacity. [0003] Silicon oxide is one of the silicon-based negative electrode material...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62H01M10/0525
CPCH01M4/386H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 薛孟尧胥鑫张长安曹新龙杨时峰田占元
Owner SHAANXI COAL & CHEM TECH INST
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