Lithium battery positive electrode material with Bi2O3/BiF<3-2x>O<x>/Zn<2+> and Mg<2+> doping bismuth fluoride layer structure and preparation method of lithium battery cathode material

A cathode material, bismuth fluoride technology, applied in battery electrodes, structural parts, circuits, etc., can solve problems such as failure, lattice mismatch, detachment of coating materials, etc., to improve shedding, increase diffusion speed, and improve comprehensive electrical Effects of chemical properties

Inactive Publication Date: 2016-07-06
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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  • Lithium battery positive electrode material with Bi2O3/BiF&lt;3-2x&gt;O&lt;x&gt;/Zn&lt;2+&gt; and Mg&lt;2+&gt; doping bismuth fluoride layer structure and preparation method of lithium battery cathode material

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Experimental program
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Effect test

Embodiment 1

[0015] Embodiment 1: Ammonium fluoride, the amount of bismuth nitrate pentahydrate substance 0.6% zinc nitrate hexahydrate, the amount of bismuth nitrate pentahydrate substance 0.6%Mg(NO 3 ) 2 ·6H 2 O, glycerol and ethylene glycol of 0.6% of bismuth nitrate pentahydrate quality are mixed with the mixed liquid of 1: 1, polyquaternium-7 of bismuth nitrate pentahydrate quality 0.6% and put into ball mill after mixing, ball mill and material The mass ratio is 20:1, and ball milled at a speed of 200 rpm for 10 hours. After the ball milling, the material is taken out, washed with water three times, and dried in a drying oven at 100°C for 10 hours to obtain Zn 2+ , Mg 2+ doped bismuth fluoride; the Zn 2+ , Mg 2+ Doped bismuth fluoride is placed in a tube furnace with a flow rate of 2L h -1 The mixed gas of oxygen and argon with a volume ratio of 20:80 is heated up to 250°C at a rate of 2°C / min and kept at this temperature for 20 minutes; after taking out the material, it is put ...

Embodiment 2

[0016] Embodiment 2: Ammonium fluoride, the amount of bismuth nitrate pentahydrate 3.3 times the amount of bismuth nitrate pentahydrate, bismuth nitrate pentahydrate substance 3% zinc nitrate hexahydrate, the amount of 3% Mg(NO 3 ) 2 ·6H 2 O, glycerol and ethylene glycol of 3% of bismuth nitrate pentahydrate quality are mixed with the mixed liquid of 1: 1 with the volume ratio, the polyquaternium-10 of bismuth nitrate pentahydrate quality 3% mixes and put into ball mill, ball mill and material The mass ratio is 20:1, ball milled at a speed of 250 rpm for 15 hours, the material is taken out after ball milling, washed with water three times, and dried in a drying oven at 110°C for 15 hours to obtain Zn 2+ , Mg 2+ doped bismuth fluoride; the Zn 2+ , Mg 2+ Doped bismuth fluoride is placed in a tube furnace with a flow rate of 6L h -1 The mixed gas of oxygen and argon with a volume ratio of 20:80 is heated up to 300°C at a rate of 6°C / min and kept at this temperature for 30 mi...

Embodiment 3

[0017] Embodiment 3: Ammonium fluoride, the amount of bismuth nitrate pentahydrate substance 5% zinc nitrate hexahydrate, the amount of bismuth nitrate pentahydrate substance 5%Mg(NO 3 ) 2 ·6H 2 O, glycerol and ethylene glycol of 5% of bismuth nitrate pentahydrate quality are mixed with the mixed liquid of 1: 1 with volume ratio, polyquaternium-7 of bismuth nitrate pentahydrate quality 5% are mixed and put into ball mill, ball mill and material The mass ratio is 20:1, ball milled at a speed of 400 rpm for 18 hours, after the ball milling is completed, the material is taken out, washed with water three times, and dried in a drying oven at 120°C for 19 hours to obtain Zn 2+ , Mg 2+ doped bismuth fluoride; the Zn 2+ , Mg 2+ Doped bismuth fluoride is placed in a tube furnace with a flow rate of 10L h -1 A mixed gas of oxygen and argon with a volume ratio of 20:80 is heated up to 360°C at a rate of 10°C / min and kept at this temperature for 40 minutes; after the material is tak...

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Abstract

The invention relates to a lithium battery cathode material with a Bi2O3/BiF<3-2x>O<x>/Zn<2+> and Mg<2+> doping bismuth fluoride layer structure and a preparation method of the lithium battery cathode material. With the characteristic that BiF3 is easily gradually oxidized to Bi2O3 in a relatively high temperature after Zn<2+> and Mg<2+> doping bismuth fluoride is synthesized by using a solid phase, a BiF<3-2x>O<x> layer (x is more than 0 and less than 0.3) and a Bi2O3 layer sequentially wraps Zn<2+> and Mg<2+> doping bismuth fluoride particles to improve surface electronic conductivity capability of the Zn<2+> and Mg<2+> doping bismuth fluoride and resist a harmful effect of an organic electrolyte on the surfaces of the material particles, and with the combination of Zn<2+> and Mg<2+> doping, the comprehensive electrochemical performance of bismuth fluoride is substantially improved.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/40H01M4/48H01M10/0525
CPCH01M4/366H01M4/40H01M4/481H01M10/0525Y02E60/10
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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