Silicon-based lithium ion battery negative electrode material and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor conductivity, low structural stability, and low cycle life, and achieve improved battery life, high capacity, and stable materials structure effect

Active Publication Date: 2018-08-14
ZHEJIANG FOREVER NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the defects existing in the above prior art, and proposes a silicon-based lithium-ion battery negative electrode material and a preparation method thereof. low lifespan problem

Method used

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  • Silicon-based lithium ion battery negative electrode material and preparation method thereof
  • Silicon-based lithium ion battery negative electrode material and preparation method thereof
  • Silicon-based lithium ion battery negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Take 1 g of nano-spherical zinc oxide particles with a particle size of 200 nm and disperse them in a mixed solution of 50 mL of water and ethanol to form a nano-zinc oxide dispersion. Then slowly add 1 g of tetraethyl orthosilicate into the above-mentioned nano-zinc oxide dispersion liquid, and stir while adding. After all the tetraethyl orthosilicate was added, 5 mL of concentrated ammonia water was added, stirred for 30 minutes, centrifuged, washed, and the obtained precipitate was dried. Then place the precipitate in a muffle furnace and heat it to 120°C for 1 hour to obtain ZnO / SiO with a core-shell structure. 2 ;

[0030] (2) Take the above-mentioned ZnO / SiO with core-shell structure 2 Mix it with zinc powder at a mass ratio of 1:4, and heat at 650°C for 3 hours in a tube furnace under the protection of nitrogen atmosphere. After the reaction, the silicon-based material ZnO / SiO with lithium storage activity is obtained x (The following uses ZnO / SiO x Indi...

Embodiment 2

[0037] (1) Take 1 g of nano-spherical zinc oxide particles with a particle size of 10 nm and disperse them in a mixed solution of 50 mL of water and ethanol to form a nano-zinc oxide dispersion. Then slowly add 3 g of tetramethyl orthosilicate into the above-mentioned nano-zinc oxide dispersion liquid, and stir while adding. After all the tetramethyl orthosilicate was added, 5 mL of concentrated ammonia water was added, stirred for 30 minutes, centrifuged, washed, and the obtained precipitate was dried. Then place the precipitate in a muffle furnace and heat it to 100°C for 1.5h to obtain ZnO / SiO with a core-shell structure 2 ;

[0038] (2) Take the above-mentioned ZnO / SiO with core-shell structure 2 Mix it with zinc powder at a mass ratio of 1:3, and heat at 750°C for 6 hours in a tube furnace under the protection of a nitrogen atmosphere. After the reaction, the silicon-based material ZnO / SiO with lithium storage activity is obtained x (The following uses ZnO / SiO x Indi...

Embodiment 3

[0045] (1) Take 1 g of nano-spherical zinc oxide particles with a particle size of 30 nm and disperse them in a mixed solution of 50 mL of water and ethanol to form a nano-zinc oxide dispersion. Then, 1.5 g of tetrabutyl orthosilicate was slowly added into the above-mentioned nano-zinc oxide dispersion liquid, and stirred while adding. After all the tetrabutyl orthosilicate was added, 5 mL of concentrated ammonia water was added, stirred for 30 minutes, centrifuged, washed, and the obtained precipitate was dried. Then place the precipitate in a muffle furnace and heat it to 60°C for 1 hour to obtain ZnO / SiO with a core-shell structure. 2 ;

[0046] (2) Take the above-mentioned ZnO / SiO with core-shell structure 2 Mix it with zinc powder at a mass ratio of 1:3, and heat at 850°C for 3 hours in a tube furnace under a nitrogen-protected atmosphere. After the reaction, the silicon-based material ZnO / SiO with lithium storage activity is obtained x (The following uses ZnO / SiO x ...

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Abstract

The invention relates to a silicon-based lithium ion battery negative electrode material and a preparation method thereof, belongs to the technical field of a lithium ion battery, and solves the problems of poor conductivity and short cycle life of the existing silicon-based negative electrode material. According to the method, nanometer zinc oxide is used as a template agent firstly, and throughhydrolysis of organic silicon, core-shell structured ZnO / SiO<2> is prepared; next, ZnO / SiO<2> and Zn powder are mixed to be subjected to high-temperature processing to obtain ZnO / SiO<x> (X is greaterthan or equal to 0 and less than 2); the product is reacted with acid to obtain hollow H-SiO<x>; the surface of H-SiO<x> is coated with polyaniline to obtain H-SiO<x> / PANI; and finally, graphene oxideis adsorbed to the surface of polyaniline and a reduction reaction is performed to obtain H-SiO<x> / PANI / RGO, namely the silicon-based lithium ion battery negative electrode material. The preparationprocess and equipment requirements are low, and the silicon-based negative electrode material is high in stability and conductivity and capable of highly prolonging the service life.

Description

technical field [0001] The invention relates to a silicon-based lithium ion battery negative electrode material and a preparation method thereof, belonging to the technical field of lithium ion batteries. Background technique [0002] With the advantages of high energy density, long cycle life, and non-polluting use, lithium-ion batteries have become the subject of new energy research and are widely used in notebooks, mobile phones, and electric vehicles. At present, lithium-ion batteries usually use graphite as the negative electrode material. However, due to the low theoretical capacity of graphite, the overall energy density of lithium-ion batteries is limited. The theoretical capacity of silicon can reach 4200mAhg -1 , is much higher than graphite, and has abundant reserves on the earth. It is an excellent negative electrode material for lithium-ion batteries; however, silicon has poor conductivity, and its volume expansion can reach more than 3 times during charging an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/624H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 童路攸韩彬陈丽鲜刘雷尹佳
Owner ZHEJIANG FOREVER NEW ENERGY TECH CO LTD
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