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Cupric fluoride-ferric fluoride composite positive electrode material having gradient coatings and used for lithium battery and preparation method thereof

A composite positive electrode material and positive electrode material technology, which is applied in the field of manufacturing high-performance copper fluoride iron fluoride composite lithium battery positive electrode materials, can solve problems such as lattice mismatch, coating material detachment, failure, etc., to improve shedding, improve electronic The effect of improving electrical conductivity and improving comprehensive electrochemical performance

Inactive Publication Date: 2016-08-31
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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  • Cupric fluoride-ferric fluoride composite positive electrode material having gradient coatings and used for lithium battery and preparation method thereof

Examples

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 0.6% volume ratio is the mixture of polyquaternium-15 and polyquaternium-28, copper sulfate pentahydrate quality 0.6% propylene Triol 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, and the ball is milled at a speed of 210 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 0.8% is the mixture of polyquaternium-7 and polyquaternium-10 of 1: 1, iron nitrate nonahydrate quality 0.8 % 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. Ball mill for 3 hours at a...

Embodiment 2

[0016] Embodiment 2: the mixture of polyquaternium-15 and polyquaternium-28 with copper sulfate pentahydrate, copper sulfate pentahydrate quality 2.5% volume ratio is the mixture of polyquaternium-15 and polyquaternium-28, copper sulfate pentahydrate quality 2.5% 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, 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 iron nitrate nonahydrate, iron nitrate nonahydrate quality 3.2% is the mixture of polyquaternium-7 and polyquaternium-10 of 1: 1, ferric nitrate nonahydrate 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 hours at a sp...

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; The volume ratio of iron nitrate nonahydrate, iron nitrate nonahydrate quality 5% is the mixture of polyquaternium-7 and polyquaternium-10 of 1: 1, iron nitrate nonahydrate quality 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 speed of 4...

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Abstract

The invention provides a Fe2O3 / FeF3-2xOx gradiently-coated cupric fluoride-ferric fluoride two-component composite positive electrode material of a lithium battery and a preparation method thereof. According to the method, the cupric fluoride-ferric fluoride two-component composite positive electrode material is prepared by using a solid-phase preparation method with polyquaternary ammonium salts with different structures as templates; then on the basis of the characteristic that FeF3 is prone to gradual oxidation into Fe2O3 at a high temperature, FeF3-2xOx (wherein 0<x<0.3) and a Fe2O3 layer successively coat the cupric fluoride-ferric fluoride two-component composite positive electrode material so as to improve surface electron conduction capability of the cupric fluoride-ferric fluoride two-component composite positive electrode material and to resist harmful effect of an organic electrolyte on particle surfaces of the material; and thus, the comprehensive electrochemical performance of the cupric fluoride-ferric fluoride two-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 copper 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 ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/582H01M4/624H01M4/628H01M10/0525Y02E60/10
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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