Novel lithium ferric manganese phosphate positive electrode material synthesis method

A technology of lithium iron manganese phosphate and cathode material, applied in phosphorus compounds, chemical instruments and methods, battery electrodes, etc., can solve the problems of low discharge capacity ratio and poor cycle stability, and achieve uniform composition, stable cycle performance and high voltage. Effect

Active Publication Date: 2021-07-02
河北九丛科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention proposes a synthesis method of a novel lithium iron manganese phosphate cathode material, which solves the problems of low discharge capacity ratio and poor cycle stability in the prior art

Method used

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  • Novel lithium ferric manganese phosphate positive electrode material synthesis method
  • Novel lithium ferric manganese phosphate positive electrode material synthesis method
  • Novel lithium ferric manganese phosphate positive electrode material synthesis method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 60.9 g of analytically pure manganese dioxide, 68 ml of 85% phosphoric acid, and 302 ml of deionized water were placed in a container and continuously stirred for 4 hours, then 93 ml of aniline was added, and the stirring was continued for 2 hours to obtain polyaniline. Separately weigh 24 g of ferric oxide, 37 g of lithium carbonate, 22.3 g of glucose monohydrate, 1.1 g of hydroxyalkyl hydroxy dimerized linoleyl ether, 0.5 g of N-palmitoyl hydroxyproline cetyl ester, and 2.1 g of polyvinylpyrrolidone. g, added to the above polyaniline liquid, and ground and stirred for 12 hours. After drying in air atmosphere, calcining in air atmosphere, the calcination temperature is 800° C., and the calcination time is 10 h, to obtain the precursor.

[0039]Add 22.3g of glucose monohydrate and 100g of water to the precursor again as a grinding medium, put it into a high-speed ball mill and grind for 8 hours to obtain a grinding slurry with a particle size D50 of 0.85um.

[0040] Pu...

Embodiment 2

[0043] 60.9 g of analytically pure manganese dioxide, 68 ml of 85% phosphoric acid, and 302 ml of deionized water were placed in a container and continuously stirred for 3 hours, then 93 ml of aniline was added, and stirring was continued for 1 hour to obtain polyaniline. Separately weigh 24g of ferric oxide, 24g of lithium hydroxide, 22.3g of glucose monohydrate, 1.6g of hydroxyalkyl hydroxydimer linoleyl ether, 0.7g of N-palmitoyl hydroxyproline cetyl ester, polyvinylpyrrolidone 2.4 g was added to the above polyaniline liquid, and ground and stirred for 8 hours. Then, after being dried in an air atmosphere, it is calcined in an air atmosphere at a calcining temperature of 500° C. and a calcining time of 8 hours to obtain a precursor.

[0044] The precursor was added with 22.3g of glucose monohydrate and 100g of water as a grinding medium, and was put into a high-speed ball mill for grinding for 8 hours to obtain a grinding slurry with a particle size D50 of 0.85 μm.

[0045...

Embodiment 3

[0048] 60.98g of analytically pure manganese dioxide, 68ml of 85% phosphoric acid, and 302ml of deionized water were placed in the container and continuously stirred for 2h, then 93ml of aniline was added, and the stirring was continued for 1h to obtain polyaniline. Separately weigh 24g of ferric oxide, 24g of lithium hydroxide, 38.5g of sucrose, 1.4g of hydroxyalkyl hydroxydimer linoleyl ether, 0.7g of N-palmitoyl hydroxyproline cetyl ester, and 2.3g of polyvinylpyrrolidone , added to the polyaniline liquid, grinding and stirring for 10h. Then, after being dried in an air atmosphere, it is calcined in an air atmosphere at a calcination temperature of 600° C. and a calcination time of 6 hours to obtain a precursor.

[0049] Add 38.5g sucrose to the precursor again, and add 100g water as a grinding medium, put it into a high-speed ball mill and grind it for 8 hours to obtain a grinding slurry with a particle size D50 of 0.85um.

[0050] Put the grinding slurry into a rake vacu...

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Abstract

The invention relates to the technical field of lithium ion batteries, and provides a novel lithium ferric manganese phosphate positive electrode material synthesis method, which comprises: S1, placing manganese dioxide, phosphoric acid and water in a container, stirring, adding aniline, and continuously stirring to obtain polyaniline; s2, weighing an iron source, a lithium source, a carbon source and an organic auxiliary agent, adding into polyaniline, and grinding and stirring; s3, drying and calcining in an air atmosphere to obtain a precursor; s4, adding the carbon source into the precursor again, adding the grinding medium, and grinding to obtain grinding slurry; s5, performing vacuum drying on the grinding slurry to obtain reaction powder; and S6, sintering the reaction powder in a protective atmosphere, cooling to room temperature, crushing, and sieving to obtain the polyaniline/carbon coated iron manganese phosphate lithium ion battery positive electrode material. Through the technical scheme, the problems of low discharge capacity ratio and poor cycling stability in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for synthesizing a novel lithium iron manganese phosphate cathode material. Background technique [0002] Recently, ternary cathode materials (LiNiCoMnO 2 ) has become a hot spot in today's industry and application due to its high discharge capacity, large weight and volume specific energy, good environmental protection, and low toxicity. It incorporates LiCoO 2 The excellent cycle performance of LiNiO 2 high discharge capacity, and LiMnO 2 With excellent safety performance, it has become a cathode material for lithium-ion batteries for high-energy-density hybrid vehicles. However, the biggest problem with ternary materials is that they are prone to oxygen evolution, causing combustion and explosion of the battery system. As production of electric vehicles increases and explosions and fires become more common, ternary materials are used cautiously. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58H01M4/62H01M10/0525
CPCC01B25/45H01M4/5825H01M4/624H01M10/0525C01P2006/40Y02E60/10
Inventor 张克强姚亚林丛日新
Owner 河北九丛科技有限公司
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