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Solid phase synthetic Co<2+> doped bismuth fluoride lithium-ion battery positive electrode material and preparation method thereof

A lithium-ion battery, cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as unpredictable effects, complex parent action mechanism, low equipment requirements, excellent electrochemical performance, and high product purity. Effect

Active Publication Date: 2015-09-09
湖州优研知识产权服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanism of ion doping or even multi-ion synergistic doping on the matrix is ​​very complicated, and the effect is often unpredictable.

Method used

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  • Solid phase synthetic Co&lt;2+&gt; doped bismuth fluoride lithium-ion battery positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: put bismuth nitrate pentahydrate, bismuth nitrate pentahydrate substance amount 0.5% cobalt nitrate hexahydrate and bismuth nitrate pentahydrate quality 0.5% perfluoroheptanoic acid and put into ball mill after mixing, the mass ratio of ball mill and material is 20:1, ball milled for 10 hours at a speed of 200 rpm, and this material was called material I; tetra-n-butylammonium fluoride, 0.5% Tween-60, tetra-n-butylammonium fluoride quality 2% dehydrated alcohol of the quality of n-butyl ammonium fluoride is mixed and put into a ball mill, the mass ratio of the ball mill and the material is 20:1, ball milled at a speed of 200 rpm for 10 hours, and this material is called material II; Put material I and material II into the ball mill according to the ratio of the amount of bismuth salt in material I to the amount of quaternary ammonium salt in material II in the ratio of 1:3, the mass ratio of ball mill and material is 20:1, and at the same time Fill the bal...

Embodiment 2

[0016]Example 2: Put bismuth chloride, 1% cobalt oxalate tetrahydrate and 2,2-difluorocyclopropanecarboxylic acid with 1% bismuth chloride mass into a ball mill, and the ball mill is mixed with the material Mass ratio is 20: 1, with 200 revolutions / minute speed ball milling 10 hours, this material is called material I; 3% dehydrated alcohol of the quality of methyl ammonium fluoride is mixed and put into a ball mill, the mass ratio of the ball mill and the material is 20:1, and ball milled at a speed of 300 rpm for 15 hours, this material is called material II; Material I and material II are put into the ball mill according to the ratio of the amount of bismuth salt in material I to the amount of quaternary ammonium salt in material II in the ratio of 1: 3, and the mass ratio of ball mill and material is 20: 1. Fill the ball mill tank with a mixed gas of nitrogen and ammonia with a volume ratio of 95:5 to one atmosphere, and mill at a speed of 350 rpm for 7 hours; take out the...

Embodiment 3

[0017] Example 3: Put bismuth chloride, cobalt chloride hexahydrate with 2% of bismuth chloride substance content and perfluoroglutaric acid with 2% of bismuth chloride mass into a ball mill, and the mass ratio of the ball mill to the material is 20 : 1, ball milled for 20 hours at a speed of 400 revs / min, and this material was called material I; benzyltrimethylammonium fluoride, 2% Span-80, 4% dehydrated alcohol of benzyltrimethylammonium fluoride mass is mixed and put into a ball mill. The mass ratio of the ball mill to the material is 20:1, and ball milled at a speed of 400 rpm for 20 hours. This material is called material II; put material I and material II into a ball mill according to the ratio of the amount of bismuth salt in material I to the amount of quaternary ammonium salt in material II in a ratio of 1:3, and the mass ratio of ball mill to material is 20:1 At the same time, the mixed gas of nitrogen and ammonia with a volume ratio of 95:5 and one atmospheric press...

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Abstract

The invention relates to a solid phase synthetic Co<2+> doped bismuth fluoride lithium-ion battery positive electrode material and a preparation method thereof. According to the method, a quaternary ammonium salt adopting fluorine as anions is adopted as a raw material, the bismuth fluoride is subjected to direct solid-phase synthesis through the large group steric hindrance effect and through the effect of a specific auxiliary agent, and the electronic conductivity of the material is improved through the Co<2+> doping, wherein the bismuth fluoride material adopted as the lithium-ion battery positive electrode material has the specific capacity exceeding 200 mAh.g<-1>. According to the present invention, the method has characteristics of low equipment requirement and high product purity, the condition that a plurality of the double salts of the bismuth fluoride and other side reaction products are generated in the liquid phase reaction can be avoided, and the material has the excellent electrochemical property.

Description

technical field [0001] The invention relates to the technical field of a method for manufacturing a high-capacity bismuth fluoride composite lithium battery cathode material. Background technique [0002] Lithium-ion secondary batteries have the absolute advantages of high volume, weight-to-energy ratio, high voltage, low self-discharge rate, no memory effect, long cycle life, and high power density. Currently, the global mobile power market has an annual share of more than 30 billion US dollars and Gradually grow at a rate of more than 10%. Especially in recent years, with the gradual depletion of fossil energy, new energy sources such as solar energy, wind energy, and biomass energy have gradually become alternatives to traditional energy sources. Among them, wind energy and solar energy are intermittent, and a large amount of energy is used simultaneously to meet the needs of continuous power supply. Energy storage batteries; urban air quality problems caused by automobi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62
CPCH01M4/362H01M4/582H01M4/626H01M10/0525Y02E60/10
Inventor 徐玲霞水淼徐晓萍陈超陈姝舒杰任元龙
Owner 湖州优研知识产权服务有限公司
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