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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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  • 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 for suppressing the volume expansion of silicon electrode materials in the process of charging and discharging. problems, while ensuring the first cycle efficiency and electrical conductivity of the silicon electrode material

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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

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preparation example Construction

[0050] The first aspect of the embodiments of the present invention provides a method for preparing a silicon / lithium silicate composite material, comprising the following steps:

[0051] S10. Introducing gaseous Si and gaseous SiO into the reaction vessel 2 and gaseous Li 2 O, and react in the gas phase;

[0052] S20. Depositing the reaction product at a temperature of 500° C. to 700° C. to obtain a silicon / lithium silicate composite material.

[0053] In the preparation method of the silicon / lithium silicate composite material provided by the first aspect of the embodiment of the present invention, gaseous Si, gaseous SiO 2 and gaseous Li 2 O, and react in a gas phase state; then, at a temperature of 500°C to 700°C, deposit the reaction product to obtain a silicon / lithium silicate composite material. The preparation method of silicon / lithium silicate composite material of the embodiment of the present invention, with gaseous Si, SiO 2 and Li 2 O is the reaction raw mat...

Embodiment 1

[0093] A silicon / lithium silicate composite material, comprising the following preparation steps:

[0094] (1) Prepare silicon / lithium silicate composite materials in an alloying furnace with three evaporation sources. First, Si, SiO 2 and Li 2 O three raw materials are respectively placed in the three evaporation source reactors of the equipment, SiO 2 , Si and Li 2 The mass ratio of O is: SiO 2 :Si:Li 2 O=1:1:1;

[0095] (2) Adjust the atmosphere inside the alloying furnace to vacuum, and the vacuum degree is controlled at -0.1±0.01MPa; 2 , Si and Li 2 The temperature of the three evaporation sources of O increased to 1200 ° C, 1200 ° C, 1600 ° C, SiO 2 , Si and Li 2 O The three reactants are evaporated after heating up; the evaporator is heated in the equipment and undergoes a series of reactions to form silicon and lithium silicate, and then deposits in the collector. The temperature range of the collector is 500 ° C to obtain a silicon / lithium silicate composite m...

Embodiment 2

[0100] A silicon / lithium silicate composite material, comprising the following preparation steps:

[0101] (1) Prepare silicon / lithium silicate composite materials in an alloying furnace with three evaporation sources. First, Si, SiO 2 and Li 2 O three raw materials are respectively placed in the three evaporation source reactors of the equipment, SiO 2 , Si and Li 2 The mass ratio of O is: SiO 2 :Si:Li 2 O=1:3:1;

[0102] (2) Adjust the atmosphere inside the alloying furnace to vacuum, and the vacuum degree is controlled at -0.1±0.01MPa; 2 , Si and Li 2 The temperature of the three evaporation sources of O increased to 1200 °C, 1200 °C and 1600 °C, SiO 2 , Si and Li 2 O The three reactants are evaporated after heating up; the evaporator is heated in the equipment and undergoes a series of reactions to form silicon and lithium silicate, and then deposits in the collector, and the temperature range of the collector is 500°C;

[0103] (3) crushing the compound in the co...

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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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