Bi<3+>,B<3+> doped copper fluoride positive electrode material coated by gradient structure and used for lithium battery and preparation method thereof

A positive electrode material, copper fluoride technology, applied in battery electrodes, structural parts, circuits, etc., can solve the problems of insufficient stability of copper fluoride materials, electrochemical performance attenuation, and low electronic conductivity, so as to improve the comprehensive electrochemical performance. Performance, improvement of electronic conductivity, effect of improvement of ionic conductivity

Inactive Publication Date: 2016-08-31
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

However, there are very few reports about copper fluoride materials as lithium-ion battery cathode materials. The main difficulty is that the electrochemical performance of copper fluoride is very sensitive to crystal water. If there is a trace of crystal water in the crystal, the electrochemical performance will be reduced There is serious attenuation; and the copper fluoride material is very easy to absorb water in the air, and at the same time it is very easy to form crystal water during the preparation process, so it is difficult to prepare and store
At the same time, the copper fluoride material is not stable enough in the organic electrolyte, and it has a negative characteristic that the electronic ...

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  • Bi&lt;3+&gt;,B&lt;3+&gt; doped copper fluoride positive electrode material coated by gradient structure and used for lithium battery and preparation method thereof

Examples

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Effect test

Embodiment 1

[0015] Embodiment 1: the ammonium fluoride of anhydrous copper sulfate, the amount of anhydrous copper sulfate substance 3.0 times, the amount of anhydrous copper sulfate substance 2% bismuth nitrate pentahydrate, the amount of anhydrous copper sulfate substance 0.5% boric acid, no Water copper sulfate quality 0.9% glycerol and ethylene glycol are put into thermostatic ball mill after mixing the mixed liquid of 1: 1 with volume ratio, anhydrous copper sulfate quality 0.9% polyquaternium-7, regulate the temperature of ball mill as 60°C, the mass ratio of the ball mill to the material is 20:1, ball mill at a speed of 200 rpm for 10 hours, take out the material after ball milling, wash with ethanol three times, and dry in a 100°C drying oven for 10 hours to prepare Bi 3+ , B 3+ Doped with copper fluoride; bismuth nitrate pentahydrate and ammonium fluoride with a mass ratio of 1:3.0, Bi with a mass of 80 times the total mass of bismuth nitrate pentahydrate and ammonium fluoride 3...

Embodiment 2

[0016] Embodiment 2: the amount of anhydrous copper sulfate, anhydrous copper sulfate substance 3.3 times ammonium fluoride, the amount of anhydrous copper sulfate substance 5% bismuth nitrate pentahydrate, the amount of anhydrous copper sulfate substance 0.7% boric acid, no Water copper sulfate quality 2.5% glycerol and ethylene glycol are put into thermostatic ball mill after mixing the mixed liquid of 1: 1, anhydrous copper sulfate quality 2.5% polyquaternium-7 with volume ratio, regulate the temperature of ball mill as 70°C, the mass ratio of the ball mill to the material is 20:1, ball mill at a speed of 300 rpm for 15 hours, take out the material after ball milling, wash with ethanol three times, and dry in a drying oven at 110°C for 16 hours to prepare Bi 3+ , B 3+ Doped with copper fluoride; bismuth nitrate pentahydrate and ammonium fluoride with a mass ratio of 1:3.3, Bi with a mass of 150 times the total mass of bismuth nitrate pentahydrate and ammonium fluoride 3+ ,...

Embodiment 3

[0017] Embodiment 3: the amount of anhydrous copper sulfate, anhydrous copper sulfate substance 3.5 times ammonium fluoride, the amount of anhydrous copper sulfate substance 10% bismuth nitrate pentahydrate, the amount of anhydrous copper sulfate substance 1% boric acid, no Water copper sulfate quality 4.5% glycerol and ethylene glycol are put into thermostatic ball mill after mixing the mixed liquid of 1: 1 with volume ratio, anhydrous copper sulfate quality 4.5% polyquaternium-10, regulate the temperature of ball mill as 80°C, the mass ratio of the ball mill to the material is 20:1, ball mill at a speed of 400 rpm for 20 hours, take out the material after ball milling, wash with ethanol three times, and dry in a drying oven at 120°C for 20 hours to prepare Bi 3+ , B 3+ Doped with copper fluoride; bismuth nitrate pentahydrate and ammonium fluoride with a mass ratio of 3.6, Bi with a mass of 170 times the total mass of bismuth nitrate pentahydrate and ammonium fluoride 3+ , B...

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Abstract

The invention provides a Bi<3+>,B<3+> doped copper fluoride positive electrode material gradiently coated by Bi2O3/BiF3-2xOx and used for a lithium battery, and a preparation method thereof. According to the method, Bi<3+>,B<3+> doped copper fluoride is prepared through solid-phase synthesis; then on the basis of the characteristic that BiF3 is prone to gradual oxidation into Bi2O3 at a high temperature, BiF3-2xOx (wherein 0<x<0.3) and a Bi2O3 layer successively coat Bi<3+>,B<3+> doped copper fluoride particles so as to improve surface electron conduction capability of Bi<3+>,B<3+> doped copper fluoride and to resist harmful effect of an organic electrolyte on particle surfaces; and comprehensive electrochemical performance of copper fluoride is greatly improved through Bi<3+>,B<3+> doping.

Description

technical field [0001] The invention relates to the technical field of a method for manufacturing a high-performance 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 caused by automo...

Claims

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Application Information

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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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