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Silicon-tin dioxide chain-shaped and dendritic core-shell structure lithium ion battery negative electrode material and preparation method thereof

A lithium-ion battery, core-shell structure technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of cycle performance decline, electrode capacity decline, easy powdering and cracking, etc., to achieve stable discharge specific capacity and operation. Simple, easy-to-use ingredients

Active Publication Date: 2021-04-02
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the huge volume expansion of the silicon material with low conductivity, it is easy to pulverize and crack during the lithiation process, which leads to a serious decline in electrode capacity and a sharp decline in cycle performance, which eventually leads to electrode failure.

Method used

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  • Silicon-tin dioxide chain-shaped and dendritic core-shell structure lithium ion battery negative electrode material and preparation method thereof
  • Silicon-tin dioxide chain-shaped and dendritic core-shell structure lithium ion battery negative electrode material and preparation method thereof
  • Silicon-tin dioxide chain-shaped and dendritic core-shell structure lithium ion battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 0.21g of nano-silicon powder into 200ml of ethanol aqueous solution, including 180ml of deionized water and 20ml of absolute ethanol, and perform ultrasonication at 60Hz for 15 minutes to obtain a uniformly dispersed nano-silicon solution. 0.12 g of tin tetrachloride pentahydrate was dissolved in the solution, and stirred under magnetic force in an oil bath at 75° C., reacted for 24 hours, and then stood overnight to obtain an aqueous solution of a silicon tin dioxide core-shell structure negative electrode material. It was subjected to suction filtration, alternately washed with absolute ethanol and deionized water for 3-5 times, and finally vacuum-dried at 80° C. for 12 hours to obtain a silicon tin dioxide core-shell structure negative electrode material (active material). The active material, conductive agent (carbon black) and binder (sodium alginate) were weighed and mixed uniformly at a mass ratio of 7:1:2, and 2.0 mL of deionized water was added to make a slu...

Embodiment 2

[0024] Add 0.34g of nano-silicon powder into 200ml of ethanol aqueous solution, including 80ml of deionized water and 20ml of absolute ethanol, and perform ultrasonication at 60Hz for 15 minutes to obtain a uniformly dispersed nano-silicon solution. 0.66g of tin tetrachloride pentahydrate was dissolved in the solution, and stirred under magnetic force in an oil bath at 60°C, reacted for 24 hours, and then stood overnight to obtain an aqueous solution of a silicon tin dioxide core-shell structure negative electrode material. It was subjected to suction filtration, alternately washed with absolute ethanol and deionized water for 3-5 times, and finally vacuum-dried at 80° C. for 12 hours to obtain a silicon tin dioxide core-shell structure negative electrode material (active material). The active material, conductive agent (carbon black) and binder (sodium alginate) were weighed and mixed uniformly at a mass ratio of 7:1:2, and 2.0 mL of deionized water was added to make a slurry,...

Embodiment 3

[0026] Add 0.58g of nano-silicon powder into 200ml of ethanol aqueous solution, including 180ml of deionized water and 20ml of absolute ethanol, and perform ultrasonication at 60Hz for 15 minutes to obtain a uniformly dispersed nano-silicon solution. 0.078g of tin tetrachloride pentahydrate was dissolved in the solution, and stirred under magnetic force in an oil bath at 75°C, reacted for 24 hours, and then stood overnight to obtain an aqueous solution of silicon tin dioxide core-shell structure negative electrode material. It was subjected to suction filtration, alternately washed with absolute ethanol and deionized water for 3-5 times, and finally vacuum-dried at 80° C. for 12 hours to obtain a silicon tin dioxide core-shell structure negative electrode material (active material). The active material, conductive agent (carbon black) and binder (sodium alginate) were weighed and mixed uniformly at a mass ratio of 7:1:2, and 2.0 mL of deionized water was added to make a slurry,...

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Abstract

The invention belongs to the technical field of lithium ion battery negative electrode materials, and particularly relates to a silicon-tin dioxide chain-shaped and dendritic core-shell structure lithium ion battery negative electrode material and a preparation method thereof. The preparation method comprises the following steps: ultrasonically dispersing nano silicon powder in an ethanol aqueoussolution, adding a certain amount of tin tetrachloride pentahydrate for reaction compounding, standing, carrying out suction filtration, washing and drying to obtain the silicon tin dioxide chain-likeand dendritic core-shell structured negative electrode material. Finally, the material is prepared into a negative pole piece, the negative pole piece is placed in a button cell, and the constant-current charge-discharge specific capacity of the button cell is detected. When the material is tested by using a Land test system at normal temperature and normal pressure, the initial coulombic efficiency of a sample with the most excellent performance of the material can reach 83.0%, and the specific capacity can still reach 1900mAh / g or above after 200 circles of charging and discharging. The material has the characteristics of rich raw materials, simplicity in operation, low cost and environmental friendliness, and the prepared silicon tin dioxide composite material has excellent performance.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a method for preparing negative electrode materials with a silicon tin dioxide core-shell structure for lithium ion batteries with chain and dendritic structures. Background technique [0002] Lithium-ion batteries are high-quality energy storage devices with high energy density, long cycle life, and high safety performance, and are considered to be one of the candidates for the next generation of high-performance rechargeable batteries. It has been widely used in various aspects such as aerospace, electric vehicles, electric energy storage systems, and military equipment. Traditional commercial lithium-ion mostly uses carbon-containing materials as negative electrodes, but its theoretical specific capacity is only 372 mAh / g, which severely limits the development of lithium-ion batteries. Power density and specific capacity. [0003] Silicon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/362H01M4/386H01M4/62H01M4/624H01M4/628H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 林荣英王慧
Owner FUZHOU UNIV
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