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Pre-lithiated silica composite material, preparation method and application

A composite material, pre-lithiated silicon technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of low efficiency of silicon oxide for the first time, and solve the problems of difficult growth control, good fast charging performance, and reduced volume expansion Effect

Active Publication Date: 2022-05-10
四川金汇能新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem of low initial efficiency of silicon oxide after pre-lithiation treatment in the prior art, the embodiment of the present invention provides a pre-lithiated silicon-oxygen composite material, preparation method and application

Method used

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  • Pre-lithiated silica composite material, preparation method and application
  • Pre-lithiated silica composite material, preparation method and application
  • Pre-lithiated silica composite material, preparation method and application

Examples

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Embodiment 1

[0062] Silicon oxide coating: commercially available silicon oxide is pulverized by a jet mill until the D50 is 4.3um and the D100 is 13.5um, and then acetylene gas is used for gas-phase coating. The coating temperature is controlled at 700°C and the coating time is 4h. Amorphous SiO@C with coated carbon content of 3.6% and D50 of 4.6um was prepared.

[0063] Preparation of precursors: Take LiH powder with a D50 of 5.8um and amorphous SiO@C powder according to the Li / Si material ratio of 0.45, and uniformly mix them under nitrogen protection to prepare a pre-lithiated precursor.

[0064] Pre-lithiation reaction: put the uniformly mixed pre-lithiation precursor in a microwave sintering furnace, set the sintering frequency of the microwave oven to 2400MHz and power to 3.8KW under a nitrogen atmosphere, and heat it to 600°C at a rate of 20°C / min before sintering After 60 minutes, cool down to room temperature with the furnace, take out and sieve to obtain the high first-efficienc...

Embodiment 2

[0068] Silicon oxide coating: commercially available silicon oxide is pulverized by a jet mill until D50 is 3.1um and D100 is 11.7um, then gas-phase coating is performed with acetylene gas, the coating temperature is controlled at 850°C, and the coating time is 6h. Preparation Amorphous SiO@C with a coated carbon content of 7.8% and a D50 of 3.5um was obtained.

[0069] Preparation of precursors: LiH powder with a D50 of 3.2um and amorphous SiO@C powder are mixed uniformly under the protection of nitrogen to prepare a pre-lithiated precursor according to the Li / Si material ratio of 0.60.

[0070] Pre-lithiation reaction: put the uniformly mixed pre-lithiation precursor in a microwave sintering furnace, set the sintering frequency of the microwave oven to 2400MHz and power to 1.0KW under a nitrogen atmosphere, and heat to 450°C at a rate of 10°C / min before sintering After 90 minutes, cool down to room temperature with the furnace, take out and sieve to obtain high first-efficie...

Embodiment 3

[0072] Silicon oxide coating: commercially available silicon oxide is pulverized by a jet mill until D50 is 5.8um and D100 is 14.6um, and then gas-phase coating is carried out with acetylene gas. The coating temperature is controlled at 650°C and the coating time is 10h. Amorphous SiO@C with a coated carbon content of 4.3% and a D50 of 6.4um was obtained.

[0073] Preparation of precursor: Take LiH powder with a D50 of 8.0um and amorphous SiO@C powder according to the Li / Si material ratio of 0.53, and uniformly mix them under nitrogen protection to prepare a pre-lithiated precursor.

[0074] Pre-lithiation reaction: put the uniformly mixed pre-lithiation precursor in a microwave sintering furnace, set the microwave oven sintering frequency to 2450MHz and power to 6.0KW under a nitrogen atmosphere, and heat to 600°C at a rate of 30°C / min before sintering After 45 minutes, cool down to room temperature with the furnace, take out and sieve to obtain high first-efficiency pre-lith...

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Abstract

In order to solve the technical problem that in the prior art, silicon monoxide subjected to pre-lithiation treatment is low in first efficiency, the embodiment of the invention provides a pre-lithiation silicon oxide composite material and a preparation method and application thereof, the pre-lithiation silicon oxide composite material comprises an inner core, the inner core is amorphous SiOx, X is larger than or equal to 0.8 and smaller than or equal to 1.2; the inner core is coated with the Li2SiO3 intermediate layer, the Li2SiO3 intermediate layer comprises a plurality of Li2SiO3 crystal grains, and amorphous silicon is dispersed in the plurality of Li2SiO3 crystal grains; and the Li2SiO3 intermediate layer is coated with the carbon coating layer. According to the embodiment of the invention, the state and proportion of the lithium source powder particles and the silicon monoxide are regulated and controlled, and the special wave band of the microwave is coupled with the basic fine structure of the material to generate heat, so that the material is rapidly, uniformly and integrally heated to the sintering temperature in a gradient-free manner; and the sintering temperature and the sintering time can be effectively reduced, the productivity is improved, the cost is reduced, and the product quality is improved.

Description

technical field [0001] The invention relates to a pre-lithiated silicon-oxygen composite material, a preparation method and an application. Background technique [0002] Silicon oxide has irreversible lithium silicate and lithium oxide generated during the first lithium intercalation process, resulting in low initial efficiency of silicon oxide. When matching with the existing positive electrode system to make a full battery, the limited lithium ions in the positive electrode cannot be effectively released after the first charging and intercalation into silicon oxide. Therefore, the high-capacity characteristics of the silicon base are difficult to exert. [0003] In order to improve the first-time efficiency of silicon oxide, the industry has developed a variety of material pre-supplement lithium technology, which reduces the irreversible capacity loss during charge and discharge by pre-supplementing part of lithium in silicon-based materials. Usually, the pre-lithiation s...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62
CPCH01M4/366H01M4/386H01M4/5825H01M4/628Y02E60/10
Inventor 吴云胜秦冯祥郭泽都胡晓东吴亚平蒋勇明
Owner 四川金汇能新材料股份有限公司