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A kind of preparation method of silicon carbon anode material

A technology of negative electrode material and silicon carbon, which is applied in the field of preparation of silicon carbon negative electrode material, can solve the problems of difficult control of the reaction process, insignificant volume expansion, complicated operation steps, etc., so as to improve the volume expansion phenomenon, stabilize the coating effect, and improve the Effects of Cycling Stability and Charge-Discharge Efficiency

Active Publication Date: 2022-08-02
QINGHAI KAIJIN NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing methods for preparing silicon-carbon anode materials, the method operation steps are complicated, the reaction process is not easy to control, and the stability is poor, which is not obvious for improving the volume expansion of silicon during charging and discharging.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of a silicon carbon negative electrode material, comprising the following preparation steps:

[0027] S1: Disperse hydrophilic nano-silica in water to obtain a silica solution; the hydrophilic nano-silica is composed of silicon tetrachloride, oxygen and hydrogen with a mass ratio of 1:0.3:1 at 220 ℃-260℃ high temperature reaction; the mass ratio of hydrophilic nano silica and water is 1:3;

[0028] S2: Drop the silica solution into the ester substance with hydrophilic and lipophilic groups, and drop while stirring, the stirring speed is 30r / min-60r / min, and the dropping time is controlled within 30min-60min. , forming water-in-oil ester-silica microspheres; the ester substances with hydrophilic and lipophilic groups are composed of propylene glycol alginate and 1,2-propylene carbonate with a mass ratio of 1:0.6; The volume ratio of esters with lipophilic groups to silica solution is 4:1;

[0029] S3: spray-drying the ester-silica microspheres to o...

Embodiment 2

[0035] A preparation method of a silicon carbon negative electrode material, comprising the following preparation steps:

[0036] S1: Disperse hydrophilic nano-silica in water to obtain a silica solution; the hydrophilic nano-silica is composed of silicon tetrachloride, oxygen and hydrogen with a mass ratio of 1:0.3:1 at 220 ℃-260℃ high temperature reaction; the mass ratio of hydrophilic nano silica and water is 1:3;

[0037] S2: Drop the silica solution into the ester substance with hydrophilic and lipophilic groups, and drop while stirring, the stirring speed is 30r / min-60r / min, and the dropping time is controlled within 30min-60min. , forming water-in-oil ester-silica microspheres; the ester substances with hydrophilic and lipophilic groups are composed of propylene glycol alginate and 1,2-propylene carbonate with a mass ratio of 1:0.6; The volume ratio of esters with lipophilic groups to silica solution is 3:1;

[0038] S3: spray-drying the ester-silica microspheres to o...

Embodiment 3

[0044] A preparation method of a silicon carbon negative electrode material, comprising the following preparation steps:

[0045] S1: Disperse hydrophilic nano-silica in water to obtain a silica solution; the hydrophilic nano-silica is composed of silicon tetrachloride, oxygen and hydrogen with a mass ratio of 1:0.3:1 at 220 ℃-260℃ high temperature reaction; the mass ratio of hydrophilic nano silica and water is 1:3;

[0046] S2: drop the silica solution into the ester substance with hydrophilic and lipophilic groups, and drop while stirring, the stirring speed is 30r / min-60r / min, and the dropping time is controlled within 30min-60min. , forming water-in-oil ester-silica microspheres; esters with hydrophilic and lipophilic groups are composed of propylene glycol alginate and 1,2-propylene carbonate with a mass ratio of 1:0.6; The volume ratio of esters with lipophilic groups to silica solution is 5:1;

[0047] S3: spray-drying the ester-silica microspheres to obtain microsph...

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Abstract

The invention discloses a preparation method of a silicon carbon negative electrode material, comprising the following preparation steps: dispersing silicon dioxide in water to obtain a silicon dioxide solution; dropping the silicon dioxide solution into an ester substance, and dropping the silicon dioxide solution while stirring , forming water-in-oil ester-silica microspheres; spray-drying the ester-silica microspheres to obtain microsphere particles; placing the microsphere particles in a high-temperature heating furnace for carbonization to obtain silicon carbon-based Material: After mixing the silicon carbon-based material, the binder and the conductive agent, carry out ball milling to obtain a slurry, and then coat the slurry on the metal foil material and dry it. In the present invention, by utilizing the characteristics of silica and ester substances, they are formed into a water-in-oil type structure, and then spray-dried to consolidate the ester-silica microspheres, make the coating effect more stable, and improve the filling effect. The volume expansion phenomenon of silicon during discharge makes its electrochemical performance better, which is beneficial to improve the cycle stability and charge-discharge efficiency of silicon-based materials.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a preparation method of a silicon carbon negative electrode material. Background technique [0002] In the existing secondary battery system, lithium-ion batteries are the most competitive secondary batteries in terms of development space and technical indicators such as life, specific energy, operating voltage and self-discharge rate. With the continuous development of electronic technology, higher requirements are also placed on lithium-ion batteries, which require higher energy density, better cycle life, better high-low temperature charge-discharge performance and safety performance, etc., which requires lithium-ion batteries. The cathode and anode materials for ion batteries need to be further developed and improved. [0003] Lithium-ion battery anode materials with many practical applications are carbon materials, such as natural graphite and graphitized mesocarb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05C01B33/12B82Y30/00B82Y40/00H01M4/48H01M4/62H01M10/0525
CPCC01B32/05C01B33/12H01M4/483H01M4/625H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 葛传长仰永军
Owner QINGHAI KAIJIN NEW ENERGY MATERIALS CO LTD