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A kind of bismuth fluoride copper fluoride composite lithium battery cathode material with gradient coating layer and preparation method thereof

A technology for 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 lattice mismatch, coating material detachment, failure, etc. problems, to achieve the effect of improving shedding, improving electronic conductivity, and improving comprehensive electrochemical performance

Active Publication Date: 2020-04-03
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of bismuth fluoride copper fluoride composite lithium battery cathode material with gradient coating layer and preparation method thereof

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Experimental program
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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

a kind of Fe 2 o 3 |FeF 3‑2x o x Gradient-coated bismuth fluoride copper fluoride two-component composite lithium battery positive electrode material and its preparation method, the method uses polyquaternium salts of different structures as templates to prepare bismuth fluoride copper fluoride two-component composite positive electrode materials in the solid phase, according to FeF 3 It is easy to be gradually oxidized to Fe at higher temperature 2 o 3 The characteristics of bismuth fluoride and copper fluoride two-component composite cathode material are sequentially coated with FeF 3‑ 2x o x , 0<x<0.3, and Fe 2 o 3 layer to improve the surface electronic conductivity of the two-component bismuth fluoride copper fluoride composite cathode material and resist the harmful effect of the organic electrolyte on the surface of the material particles; thereby greatly improving the bismuth fluoride copper fluoride two-component composite cathode material Comprehensive electrochemical performance.

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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Patent Type & Authority Patents(China)
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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