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Modified ferric fluoride nano-composite anode material and preparing method and application thereof

A positive electrode material and nanocomposite technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of poor polarization rate performance and cycle performance, small specific capacity of lithium-ion batteries, ion Bond-to-bond energy bandgap width and other issues to achieve the effect of improving rate characteristics and energy density, excellent rate characteristics and cycle performance, and improving electrical conductivity

Active Publication Date: 2016-11-09
深圳鑫茂新能源技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the iron fluoride cathode materials currently obtained have problems such as poor cycle stability, low electronic conductivity, small reversible capacity, and wide band gap between ionic bonds of iron fluoride, which leads to the actual specific capacity of lithium-ion batteries. And energy density is low, and the polarization performance is serious, the rate performance and cycle performance are poor
thus limiting its practical application

Method used

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  • Modified ferric fluoride nano-composite anode material and preparing method and application thereof
  • Modified ferric fluoride nano-composite anode material and preparing method and application thereof
  • Modified ferric fluoride nano-composite anode material and preparing method and application thereof

Examples

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Effect test

Embodiment 1

[0042] Example 1 Preparation of modified ferric fluoride nanocomposite cathode material

[0043] Prepare 0.15mol / L Fe(NO 3 ) 3 9H 2 O ethanol solution; prepare 0.45mol / L NH at a molar ratio of iron ion to fluoride ion of 1:3 4 The ethanol solution of F; the prepared Fe(NO 3 ) 3 9H 2 O ethanol solution and NH 4 Mix the F ethanol solution at 25°C and 101.325Kpa, then add 0.05mol CrCl 3 ·6H 2 O, mix and stir at a constant speed for 8 hours, then centrifuge at 6000r / min for 20 minutes, discard the supernatant and wash the centrifuged sediment with absolute ethanol for 2 to 3 times; dry the washed sediment in a vacuum oven at 80°C for 5 hours, then Carry out heat treatment and sintering in a tube-type atmosphere furnace filled with Ar atmosphere, heat up at a rate of 5°C / min, react at a constant temperature of 300°C for 15 hours, then cool down at a rate of 10°C / min, and then pulverize the sintered material after cooling down to room temperature , sieve to get doped Cr 3+...

Embodiment 2

[0044] Example 2 Preparation of modified ferric fluoride nanocomposite cathode material

[0045] Prepare 0.2mol / L Fe(NO 3 ) 3 9H 2 O ethanol solution; prepare 0.64mol / L NH at a molar ratio of iron ion to fluoride ion of 1:3.2 4 The ethanol solution of F; the prepared Fe(NO 3 ) 3 9H 2 O in ethanol and NH 4 Mix the ethanol solution of F at 25°C and 101.325Kpa, then add 0.1mol CrCl 3 ·6H 2 O, mix and stir at a constant speed for 10 hours, then centrifuge at 6000r / min for 10 minutes, discard the supernatant and wash the centrifuged precipitate with absolute ethanol for 2 to 3 times; dry the washed precipitate in a vacuum oven at 70°C for 8 hours, then Carry out heat treatment and sintering in a tube-type atmosphere furnace filled with Ar atmosphere, heat up at a rate of 5°C / min, react at a constant temperature of 350°C for 13 hours, cool down at a rate of 10°C / min, and cool down to room temperature, then pulverize the sintered material, Sieve to get doped Cr 3+ The ferri...

Embodiment 3

[0046] Example 3 Preparation of modified ferric fluoride nanocomposite cathode material

[0047] Prepare 0.18mol / L Fe(NO 3 ) 3 9H 2 Ethanol solution of O; prepare 0.648mol / L NH according to the molar ratio of iron ion and fluoride ion as 1:3.6 4 The ethanol solution of F; the prepared Fe(NO 3 ) 3 9H 2 O in ethanol and NH 4 Mix the ethanol solution of F at 25°C and 101.325Kpa, then add 0.2mol CrCl 3 ·6H 2 O, mix and react at a constant speed for 5 hours, then centrifuge at 6000r / min for 30 minutes, discard the supernatant and wash the centrifuged sediment with absolute ethanol 2-3 times; dry the washed sediment in a vacuum oven at 80°C for 6 hours, Then carry out heat treatment and sintering in a tube-type atmosphere furnace filled with Ar atmosphere, heat up at a rate of 10°C / min, react at a constant temperature of 400°C for 13 hours, cool down at a rate of 10°C / min, and then pulverize the sintered material after falling to room temperature , sieve to get doped Cr 3+...

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Abstract

The invention relates to the field of battery anode materials and discloses a modified ferric fluoride nano-composite anode material and a preparing method and application thereof. The modified ferric fluoride nano-composite anode material is prepared from a molysite alcohol solution, a villiaumite alcohol solution and chromic salt. The preparing method of the modified ferric fluoride nano-composite anode material comprises the following steps that firstly, the molysite alcohol solution is prepared; secondly, the villiaumite alcohol solution is prepared; third, the molysite alcohol solution and the villiaumite alcohol solution are mixed; fourthly, chromic salt is added, centrifuging is carried out after a mixing and stirring reaction, and precipitate is obtained and washed and centrifuged with absolute ethyl alcohol; fifthly, high-temperature drying is carried out, then a high-temperature reaction is carried out under the protection of inert gas, cooling is carried out, and the product is obtained. The modified ferric fluoride nano-composite anode material is high in specific discharge capacity, multiplying power and circulation stability. The preparing method of the modified ferric fluoride nano-composite anode material is simple in process, low in cost and beneficial to industrial production.

Description

technical field [0001] The invention relates to the field of positive electrode materials for batteries, in particular to a modified iron fluoride nanocomposite positive electrode material and its preparation method and application. Background technique [0002] As a new energy industry, lithium-ion batteries have been widely used in various portable electronic products, New energy vehicles and other fields. [0003] Lithium-ion battery cathode material is an important part of the battery, which determines the main performance parameters of lithium-ion batteries such as energy density, service life, and safety performance. Since the commercialization of lithium-ion batteries in the 1990s, the actual specific capacity of cathode materials has been between 100-180mAh / g. The low specific capacity of cathode materials is the main factor causing capacity bottlenecks. Research on new high-capacity lithium-ion batteries Cathode materials are imminent. The earliest commercialized...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/582H01M4/626H01M10/0525Y02E60/10
Inventor 黄思李军许帅军李雪峰李少芳
Owner 深圳鑫茂新能源技术股份有限公司
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