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Method for synthesizing lithium ion battery cathode material lithium iron phosphate through in situ polymerizing and cladding

A technology for lithium ion batteries and cathode materials, which is applied in the field of in-situ polymerization and coating to synthesize lithium iron phosphate cathode materials for lithium ion batteries, can solve problems such as poor cycle performance of materials, achieve good cycle performance, improve lithium ion diffusion rate, The effect of improving electronic conductivity

Inactive Publication Date: 2015-05-20
CHONGQING TERUI BATTERY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrical conductivity and voltage platform of the material prepared by this method have been improved, but the cycle performance of the material is not good

Method used

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  • Method for synthesizing lithium ion battery cathode material lithium iron phosphate through in situ polymerizing and cladding
  • Method for synthesizing lithium ion battery cathode material lithium iron phosphate through in situ polymerizing and cladding
  • Method for synthesizing lithium ion battery cathode material lithium iron phosphate through in situ polymerizing and cladding

Examples

Experimental program
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Effect test

example 1

[0035] Add the aniline monomer to 0.3 M NH with vigorous stirring 4 h 2 PO 4 solution, followed by 0.3M FeCl 3 Solution can be added to the above solution, and after reacting for 5 hours, FePO 4 / PANI precursor, then the Li 2 CO 3 The powder is directly added to the above precursor, stirred vigorously on a magnetic stirrer for 2 hours, and then spray-dried to obtain the precursor powder. The precursor powder is heated to 650°C at a heating rate of 15°C / min under an inert atmosphere (nitrogen). And keep the temperature for 5h, then cool to room temperature, and make nano-porous LiFePO 4 / C sample powder. where NH 4 h 2 PO 4 , FeCl 3 , the addition of aniline and lithium carbonate meet: Li:Fe:P=1:1:1 (molar ratio), carbon content is synthetic LiFePO 4 5% (mass ratio) of / C.

[0036] Positive electrode sheet preparation process: LiFePO 4 / C active material, acetylene black, and binder (polyvinylidene fluoride), mix evenly according to the mass ratio of 90:5:5, make a...

Embodiment 2

[0039] Pyrrole monomer was added to 0.3M ammonium monohydrogen phosphate solution under vigorous stirring, followed by 0.3M FeCl 3 The solution was added to the above solution, and after 7 hours of reaction, black FePO 4 / PPy precursor, then add lithium acetate powder directly to the above precursor, stir vigorously on a magnetic stirrer for 1 h, and then spray dry the precursor powder, and dry the precursor powder in an inert atmosphere (nitrogen) at 30 °C / The heating rate of min is heated to 700°C, and the temperature is maintained for 5 hours, then cooled to room temperature, and nano-sized porous LiFePO is prepared after sieving. 4 / C sample powder. Wherein Li:Fe:P=1:1:1 (molar ratio), the carbon content is synthetic LiFePO 4 / 7% of C (mass ratio).

example 3

[0041] Add acrylonitrile monomer to 0.3M phosphoric acid solution under vigorous stirring, then add 0.3M ferric nitrate solution to the above solution, after 5 hours of reaction, FePO 4 / PAN precursor, then add lithium hydroxide powder directly to the above precursor, stir vigorously on a magnetic stirrer for 2h, and then spray dry the precursor powder, and dry the precursor powder in an inert atmosphere (nitrogen) at 1 °C / min heating rate to 500 ° C, and keep the temperature for 15 hours, then cooled to room temperature, after passing through the sieve to produce nano-porous LiFePO 4 / C sample powder. Wherein Li:Fe:P=1:1:1 (molar ratio), the carbon content is synthetic LiFePO 4 10% of / C (mass ratio).

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Abstract

The invention discloses a method for synthesizing lithium ion battery cathode material lithium iron phosphate through in situ polymerizing and cladding. The lithium iron phosphate is prepared by the following steps of (1) dissolving a phosphorus source in water and uniformly mixing, and then adding a polymer monomer into the mixed liquor under stirring and uniformly mixing, wherein the polymer monomer is one of phenylamine, pyrrole, crylic acid, vinyl cyanide, ethylene glycol, vinyl chloride and vinyl benzene; (2) slowly adding an iron source solution into the mixed solution prepared in the step (1), and mixing the two solutions to react so as to prepare a precursor solution; (3) adding a lithium source into the precursor solution, stirring intensely, and performing spray drying to prepare precursor powder; and (4) calcining the precursor powder at high temperature to prepare a nanoscale porous LiFePO4 / C sample. The material prepared by the method is relatively high in charge and discharge capacity, relatively good in rate capability and excellent in cycling performance. The lithium iron phosphate is synthesized by a solid-liquid combination method easy to be commercialized, the method is easy to operate and short in technological process; besides substituted sources are easily available, and the manufacturing cost is low.

Description

technical field [0001] The invention relates to a method for in-situ polymerization coating and synthesizing lithium iron phosphate, a cathode material of a lithium ion battery. Background technique [0002] At present, lithium cobalt oxide is the main anode material for commercial small batteries in the market. However, due to its poor crystal structure and poor thermal stability, lithium cobalt oxide has serious safety hazards, and cobalt resources are limited and costly. Currently, only Can be applied to small batteries. In the field of high-capacity and high-power batteries, phosphoric acid-based materials, manganese-based materials, and nickel-cobalt-manganese ternary materials are the main cathode materials currently used. As the price of nickel and cobalt raw materials has been rising, although the safety of ternary materials has been improved, the cost is difficult to reduce; lithium manganate has poor cycle performance due to its congenital structural defects, so t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62
CPCH01M4/0471H01M4/366H01M4/5825H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 刘红程冲陈太军
Owner CHONGQING TERUI BATTERY MATERIAL
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