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Bismuth fluoride/ferric fluoride composite positive electrode material with gradient cladding layer of lithium battery and preparation method of composite positive electrode material

A bismuth fluoride-coated iron fluoride dual-composite positive electrode material technology is applied to battery electrodes, circuits, electrical components, etc., which can solve problems such as lattice mismatch, detachment and failure of coating materials, and achieve improved shedding and improved Electron conductivity and the effect of improving comprehensive electrochemical performance

Inactive Publication Date: 2016-07-27
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/ferric fluoride composite positive electrode material with gradient cladding layer of lithium battery and preparation method of composite positive electrode material

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Experimental program
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Effect test

Embodiment 1

[0015] Embodiment 1: the volume ratio of bismuth nitrate pentahydrate, bismuth nitrate pentahydrate quality 0.5% is the mixed liquid of polyquaternium-22 and polyquaternium-39 of 1:1, the quality of bismuth nitrate pentahydrate 0.5% Glycerol and ethylene glycol are mixed with a mixed liquid with a volume ratio of 1:1 and then put into a ball mill. The mass ratio of the ball mill to the material is 20:1. Ball milling is performed at a speed of 200 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 iron nitrate nonahydrate, iron nitrate nonahydrate quality 0.7% is the mixed liquid of polyquaternium-7 and polyquaternium-10 of 1: 1, ferric nitrate nonahydrate Glycerol and ethylene glycol with a mass ratio of 0.7% are mixed with a mixed liquid with a volume ratio of 1:1 and then put into a ball mill. The mass ratio of the ball mill to the material is 20:1, and the ball mill is completed at a spe...

Embodiment 2

[0016] Embodiment 2: the volume ratio of bismuth nitrate pentahydrate, bismuth nitrate pentahydrate quality 2% is the mixed liquid of polyquaternium-22 and polyquaternium-39 of 1:1, the quality of bismuth nitrate pentahydrate 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 milling 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 iron nitrate nonahydrate, ferric nitrate nonahydrate quality 3% is the mixed liquid of polyquaternium-7 and polyquaternium-10 of 1: 1, ferric nitrate nonahydrate Mix 3% glycerol and ethylene glycol with a mixed liquid with a volume ratio of 1:1 and put it into a ball mill. The mass ratio of the ball mill to the material is 20:1. Ball mill for 4 hours at a speed of 300 rpm, and the ball mill is completed. After taking o...

Embodiment 3

[0017] Embodiment 3: the volume ratio of bismuth nitrate pentahydrate, bismuth nitrate pentahydrate quality 5% is the mixed liquid of polyquaternium-22 and polyquaternium-39 of 1:1, the quality of bismuth nitrate pentahydrate 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 milling 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; The volume ratio of iron nitrate nonahydrate, ferric nitrate nonahydrate quality 5% is the mixed liquid of polyquaternium-7 and polyquaternium-10 of 1: 1, ferric nitrate nonahydrate Glycerol and ethylene glycol with a volume ratio of 5% of glycerol and ethylene glycol are mixed and 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 the ball mil...

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Abstract

The invention relates to a Fe<2>O<3> / FeF<3-2x>O<x> gradient cladding bismuth fluoride / ferric fluoride dual-constituent composite positive electrode material of a lithium battery and a preparation method of the composite positive electrode material. The bismuth fluoride / ferric fluoride dual-constituent composite positive electrode material is prepared through a solid phase by taking quaternary ammonium salts with different structures as template, FeF<3-2x>O<x> (x is more than 0 but less than 0.3) and a Fe<2>O<3> layer sequentially wrap the bismuth fluoride / ferric fluoride dual-constituent composite positive electrode material according to the characteristic that FeF<3> is easy to be gradually oxidized to Fe<2>O<3> in a relatively high temperature, so that the surface electron conductivity capability of the bismuth fluoride / ferric fluoride dual-constituent composite positive electrode material is improved, an adverse effect of an organic electrolyte on the surface of the material particle is resisted, so that the comprehensive electrochemical performance of the bismuth fluoride / ferric fluoride dual-constituent composite positive electrode material is substantially improved.

Description

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

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M10/0525
CPCH01M4/366H01M4/52H01M10/0525Y02E60/10
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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