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Bismuth fluoride and copper fluoride composite lithium ion battery positive electrode material with gradient coating layer, and preparation method therefor

A technology of coating bismuth fluoride copper fluoride and bismuth fluoride copper fluoride is applied in the field of high-performance bismuth fluoride copper fluoride composite lithium battery cathode material manufacturing, and can solve the detachment of coating material, lattice mismatch, failure, etc. problems, to achieve the effect of improving shedding, improving electronic conductivity, and improving comprehensive electrochemical performance

Active Publication Date: 2016-08-10
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after many cycles, the battery material fails due to the detachment of the cladding material from the matrix material due to the lattice mismatch between the cladding material and the matrix material and the volume change of the matrix material during cycling.

Method used

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  • Bismuth fluoride and copper fluoride composite lithium ion battery positive electrode material with gradient coating layer, and preparation method therefor

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Effect test

Embodiment 1

[0015] Embodiment 1: the mixture of polyquaternium-15 and polyquaternium-28 with copper sulfate pentahydrate, copper sulfate pentahydrate quality 0.5% volume ratio is the mixture of polyquaternium-15 and polyquaternium-28, copper sulfate pentahydrate quality 0.5% propylene Triol and ethylene glycol are put into a ball mill after being mixed with a mixed liquid with a volume ratio of 1:1. The mass ratio of the ball mill to the material is 20:1. Ball milling is performed at a speed of 220 rpm for 3 hours. After the ball milling is completed, the material is taken out and Claim this material as material I; The volume ratio of bismuth nitrate pentahydrate, bismuth nitrate pentahydrate quality 0.9% is the mixture of polyquaternium-7 and polyquaternium-10 of 1: 1, the quality of bismuth nitrate pentahydrate 0.9% % of glycerol and ethylene glycol are mixed with a mixed liquid with a volume ratio of 1:1 and put into a ball mill. The mass ratio of the ball mill to the material is 20:1. ...

Embodiment 2

[0016] Embodiment 2: the mixture of polyquaternium-15 and polyquaternium-28 with copper sulfate pentahydrate, copper sulfate pentahydrate quality 2.6% volume ratio is the mixture of polyquaternium-15 and polyquaternium-28, copper sulfate pentahydrate quality 2.6% propylene Triol and ethylene glycol are put into a ball mill after being mixed with a mixed liquid with a volume ratio of 1:1. The mass ratio of the ball mill to the material is 20:1, and ball milled at a speed of 300 rpm for 4 hours. After the ball milling is completed, the material is taken out, and Claim this material as material I; The volume ratio of bismuth nitrate pentahydrate, bismuth nitrate pentahydrate quality 3.2% is the mixture of polyquaternium-7 and polyquaternium-10 of 1: 1, bismuth nitrate pentahydrate quality 3.2% % glycerol and ethylene glycol are mixed with a mixed liquid with a volume ratio of 1:1 and put into a ball mill. The mass ratio of the ball mill to the material is 20:1. Ball mill for 4 hou...

Embodiment 3

[0017] Embodiment 3: the mixture of polyquaternium-15 and polyquaternium-28 with copper sulfate pentahydrate, copper sulfate pentahydrate quality 5% volume ratio is the mixture of polyquaternium-15 and polyquaternium-28, copper sulfate pentahydrate quality 5% acrylic acid Triol and ethylene glycol are put into a ball mill after being mixed with a mixed liquid with a volume ratio of 1:1. The mass ratio of the ball mill to the material is 20:1, and ball milled at a speed of 400 rpm for 6 hours. After the ball milling is completed, the material is taken out, and Claim this material as material I; Bismuth nitrate pentahydrate, bismuth nitrate pentahydrate quality 4.5% volume ratio is the mixture of polyquaternium-7 and polyquaternium-10 of 1: 1, bismuth nitrate pentahydrate quality 4.5% % glycerol and ethylene glycol are mixed with a mixed liquid with a volume ratio of 1:1 and put into a ball mill. The mass ratio of the ball mill to the material is 20:1. Ball mill for 6 hours at a ...

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Abstract

The invention discloses an Fe<2>O<3> and FeF<3-2x>O<x> gradient coated bismuth fluoride and copper fluoride dual-component composite lithium ion battery positive electrode material, and a preparation method therefor. According to the preparation method, poly-quaternary ammonium salt of different structures is taken as a template solid phase to prepare the bismuth fluoride and copper fluoride dual-component composite positive electrode material; according to the characteristic that FeF<3> is prone to be gradually oxidized into Fe<2>O<3> at a relatively high temperature, the exterior of the bismuth fluoride and copper fluoride dual-component composite positive electrode material is coated with FeF<3-2x>O<x> and the Fe<2>O<3> layer in sequence, wherein x is greater than 0 and less than 0.3, so as to improve the surface electron conductivity of the bismuth fluoride and copper fluoride dual-component composite positive electrode material in order to resist the harmful effect on the surfaces of the material granules from the organic electrolyte; and consequently, the comprehensive electrochemical performance of the bismuth fluoride and copper fluoride dual-component composite positive electrode material is greatly improved.

Description

technical field [0001] The invention relates to the technical field of a method for manufacturing a high-performance bismuth fluoride copper 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...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M10/0525
CPCH01M4/366H01M4/525H01M10/0525Y02E60/10
Inventor 方敏华水淼李月陈超李弯弯舒杰任元龙
Owner NINGBO UNIV
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