Silicon/lithium silicate composite material, preparation method thereof and power battery

A composite material, lithium silicate technology, applied in silicates, secondary batteries, battery electrodes, etc., can solve the problem of lack of effective methods to suppress silicon electrode materials, improve the first charge and discharge efficiency, increase volume expansion Risk, bloat-reducing effect

Pending Publication Date: 2021-12-10
EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a silicon/lithium silicate composite material and a preparation method thereof, aiming to solve the problem in the prior art that there is still no effective method fo

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  • Silicon/lithium silicate composite material, preparation method thereof and power battery
  • Silicon/lithium silicate composite material, preparation method thereof and power battery
  • Silicon/lithium silicate composite material, preparation method thereof and power battery

Examples

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Example Embodiment

[0050] The first aspect of the embodiments of the present invention provide a method of preparing a silicon / silicon silicon-silicate composite material comprising the steps of:

[0051] S10. Access the gaseous Si in the reaction vessel, gaseous SIO 2 And gaseous Li 2 O and react in the vapor phase;

[0052] S20. The reaction product is deposited at a temperature of 500 ° C to 700 ° C to obtain a silicon / silicate composite material.

[0053] The method of preparing a silicon / silicon silicate composite material provided in the first aspect of the first aspect of the present invention, in the reaction vessel, gaseous Si, gaseous SIO 2 And gaseous Li 2 O and react under the vapor phase; then, the reaction product is deposited under conditions having a temperature of 500 ° C to 700 ° C to obtain a silicon / silicate composite material. The preparation method of silicon / silicate composite material of the present invention is based on gaseous Si, SiO 2 LI 2 O is a reaction raw ma...

Example Embodiment

[0092] Example 1

[0093] Silicon / silicate composite, including the following preparation steps:

[0094] (1) Preparation of silicon / silicate composite materials in alloying furnaces with three evaporation sources, first, Si, SiO 2 LI 2 O three raw materials are placed in three evapogeny reactors of the device, SiO 2 Si and Li 2 O The quality ratio is: SIO 2 : Si: li 2 O = 1: 1: 1;

[0095] (2) Adjusting the internal atmosphere of the alloying furnace is vacuum, the vacuum is controlled in -0.1 ± 0.01 MPa; SiO 2 Si and Li 2 O Three evaporate temperatures rose to 1200 ° C, 1200 ° C, 1600 ° C, SiO 2 Si and Li 2 O three reactants were evaporated after heating the temperature; the evaporation was thermally received a series of reactions to form silicon and lithium silicate, and then deposited in the collector, the collector temperature range of 500 ° C, resulting in a silicon / silicon oxylate composite material;

[0096] (3) Publit the complex in the collector in step (2) to obta...

Example Embodiment

[0099] Example 2

[0100] Silicon / silicate composite, including the following preparation steps:

[0101] (1) Preparation of silicon / silicate composite materials in alloying furnaces with three evaporation sources, first, Si, SiO 2 LI 2 O three raw materials are placed in three evapogeny reactors of the device, SiO 2 Si and Li 2 O The quality ratio is: SIO 2 : Si: li 2 O = 1: 3: 1;

[0102] (2) Adjusting the internal atmosphere of the alloying furnace is vacuum, the vacuum is controlled in -0.1 ± 0.01 MPa; SiO 2 Si and Li 2 O Three evaporation sources rose to 1200 ° C, 1200 ° C and 1600 ° C, SiO 2 Si and Li 2 O three reactants were evaporated after heating the temperature; the evaporation received a series of reaction to form silicon and lithium silicate in the equipment, and then deposited in the collector, the collector temperature range of 500 ° C;

[0103] (3) Possify the composite in the collector in step (2) to obtain a combined composite material having a particle diame...

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Abstract

The invention belongs to the technical field of new energy, and particularly relates to a preparation method of a silicon/lithium silicate composite material. The preparation method comprises the steps of introducing gaseous Si, gaseous SiO2 and gaseous Li2O into a reaction container, and reacting in a gaseous phase state; and depositing a reaction product at the temperature of 500-700 DEG C to obtain the silicon/lithium silicate composite material. According to the preparation method of the silicon/lithium silicate composite material, all the raw material components react in a gas phase state, the reaction is more sufficient and uniform, phase state distribution in a product is more uniform, internal defect materials of the composite material are reduced, material volume expansion caused by stress between different phases in the composite material is avoided, and the stability and the first charge-discharge efficiency of the material are improved.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a carbon-coated silicon / lithium silicate composite material, a preparation method of the silicon / lithium silicate composite material, and a power battery. Background technique [0002] Power batteries have great application prospects in energy storage, mobile communications, new energy, aerospace and other fields, and have attracted close attention from domestic and foreign scientific researchers and business units. High energy density, long battery life, and high safety performance are the main directions for the development of power batteries at present, and the improvement of battery material capacity is one of the focuses of battery material research. At present, most commercial lithium-ion battery anode materials are graphite. The theoretical value of the traditional graphite anode material is 372mAh / g. Its relatively low theoretical gram capacity and compacti...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38H01M10/0525C01B33/02C01B33/32
CPCH01M4/62H01M4/625H01M4/386H01M10/0525C01B33/02C01B33/32Y02E60/10
Inventor 张惠赵文文
Owner EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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