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Fe<2>O<3>/FeF<3-2x>O<x>/Bi<3+> and La<3+> doping ferric fluoride layer structured positive electrode material of lithium battery and preparation method of positive electrode material

A positive electrode material and iron fluoride layer technology, applied in battery electrodes, structural parts, circuits, etc., can solve problems such as lattice mismatch, coating material detachment, failure, etc., to improve shedding, weaken lithium ion binding, improve Effect of lithium ion conductivity

Active Publication Date: 2016-07-27
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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  • Fe&lt;2&gt;O&lt;3&gt;/FeF&lt;3-2x&gt;O&lt;x&gt;/Bi&lt;3+&gt; and La&lt;3+&gt; doping ferric fluoride layer structured positive electrode material of lithium battery and preparation method of positive electrode material

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Embodiment 1

[0015] Embodiment 1: Ammonium fluoride, the amount of 0.8% bismuth nitrate pentahydrate, the amount of iron nitrate nonahydrate 0.8% La(NO 3 ) 3 ·6H 2 O, glycerol and ethylene glycol of 0.8% of ferric nitrate nonahydrate quality are mixed with the mixed liquid of 1: 1 with volume ratio, polyquaternium-7 of ferric nitrate nonahydrate quality 0.8% are mixed and put into ball mill, ball mill and material The mass ratio is 20:1, ball milled at a speed of 200 rpm for 10 hours, the material is taken out after ball milling, washed with water three times, and dried in a drying oven at 100°C for 10 hours to prepare Bi 3+ , La 3+ doped with ferric fluoride; the Bi 3+ , La 3+ Doped ferric fluoride is put into the tube furnace, and the flow rate is 1.5L h -1 A mixed gas of oxygen and argon with a volume ratio of 10:90 is heated up to 180°C at a rate of 2°C / min and kept at this temperature for 10 minutes; after the material is taken out, it is put into an air atmosphere and the temper...

Embodiment 2

[0016] Embodiment 2: Ammonium fluoride, the amount of 3% bismuth nitrate pentahydrate, the amount of 3% La(NO 3 ) 3 ·6H 2 O, glycerol and ethylene glycol of 3% of ferric nitrate nonahydrate quality are mixed with the mixed liquid of 1: 1, the polyquaternium-7 of 3% of ferric nitrate nonahydrate quality by volume and put into ball mill, ball mill and material The mass ratio is 20:1, ball milled at a speed of 300 rpm for 15 hours, after the ball milling is completed, the material is taken out, washed with water three times, and dried in a drying oven at 110°C for 15 hours to prepare Bi 3+ , La 3+ doped with ferric fluoride; the Bi 3+ , La 3+ Doped ferric fluoride is placed in a tube furnace with a flow rate of 5L h -1 The mixed gas of oxygen and argon with a volume ratio of 10:90 is heated up to 220°C at a rate of 5°C / min and kept at this temperature for 15 minutes; after the material is taken out, it is put into an air atmosphere and the temperature is constant. Keep it i...

Embodiment 3

[0017] Embodiment 3: Ammonium fluoride, the amount of 4.5% bismuth nitrate pentahydrate, the amount of iron nitrate nonahydrate 4.5% La (NO 3 ) 3 ·6H 2 O, glycerol and ethylene glycol of 4.5% of ferric nitrate nonahydrate quality are mixed with the mixed liquid of 1: 1 with the volume ratio, polyquaternium-10 of 4.5% of ferric nitrate nonahydrate quality is 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 20 hours, the material is taken out after ball milling, washed with water three times, and dried in a drying oven at 120°C for 20 hours to prepare Bi 3+ , La 3+ doped with ferric fluoride; the Bi 3+ , La 3+ Doped ferric fluoride is placed in the tube furnace, and the flow rate is 10L h -1 The mixed gas of oxygen and argon with a volume ratio of 10:90 is heated up to 260°C at a rate of 8°C / min and kept at this temperature for 25 minutes; after the material is taken out, it is put into an air atmosphere and ...

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Abstract

The invention relates to a Fe<2>O<3> / FeF<3-2x>O<x> / Bi<3+> and La<3+> doping ferric fluoride layer structured positive electrode material of a lithium battery and a preparation method of positive electrode material. After solid-phase synthesis of Bi<3+> and La<3+> doping ferric fluoride, FeF<3-2x>O<x> (x is more than 0 but less than 0.3) and a Fe<2>O<3> layer sequentially wrap Bi<3+> and La<3+> doping ferric fluoride particle 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 Bi<3+> and La<3+> doping ferric fluoride is improved, and an adverse effect of an organic electrolyte on the surface of the material particle is resisted; and with the combination of Bi<3+> and La<3+> doping, the comprehensive electrochemical performance of the ferric fluoride is substantially improved.

Description

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

Claims

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Application Information

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