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Self-assembly preparation method of lithium manganese phosphate positive electrode material and lithium manganese phosphate positive electrode material

A technology of lithium manganese phosphate, cathode material, applied in nanotechnology for materials and surface science, battery electrodes, electrical components, etc., can solve problems such as low electrical conductivity, improve electrical conductivity, excellent electrochemical performance, improve The effect of conductivity

Active Publication Date: 2017-04-26
GUANGZHOU AUTOMOBILE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, LiMnPO 4 In the practical process, there are problems such as low conductivity (its conductivity is only about LiFePO 4 One-thousandth of), which is almost an insulator

Method used

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  • Self-assembly preparation method of lithium manganese phosphate positive electrode material and lithium manganese phosphate positive electrode material
  • Self-assembly preparation method of lithium manganese phosphate positive electrode material and lithium manganese phosphate positive electrode material
  • Self-assembly preparation method of lithium manganese phosphate positive electrode material and lithium manganese phosphate positive electrode material

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preparation example Construction

[0024] The self-assembly preparation method of the spherical lithium manganese phosphate composite cathode material of the present invention comprises:

[0025] Weigh an appropriate amount of carbon nanotubes, and ultrasonically disperse them in deionized water. The ultrasonic dispersion time is 0.5 to 12.0 hours, preferably 0.5 to 4.0 hours, most preferably 1 to 2 hours;

[0026] Weigh manganese sulfate and add it to the liquid to form a manganese sulfate / carbon nanotube liquid; control the concentration of manganese sulfate to 0.1-0.3mol / L, preferably 0.15mol / L;

[0027] Configure an aqueous ammonium persulfate solution, and control the concentration of the aqueous ammonium persulfate solution to be 0.1 to 0.4 mol / L, preferably 0.20 mol / L;

[0028] Under the constant temperature stirring condition of 70-90°C, the ammonium persulfate aqueous solution is added dropwise to the manganese sulfate / carbon nanotube liquid, wherein the ammonium persulfate aqueous solution and the man...

Embodiment 1

[0032] The carbon nanotubes were added into 50 ml of deionized water, and ultrasonically dispersed for 0.5 hour to make them uniformly dispersed to obtain a mixture of carbon nanotubes and deionized water. An appropriate amount of manganese sulfate is added to the above mixture to obtain a manganese sulfate / carbon nanotube liquid, and the concentration of manganese sulfate in the liquid is controlled to be 0.15 mol / L. Prepare 50 ml of 0.20 mol / L ammonium persulfate aqueous solution. The ammonium persulfate solution was added dropwise to the manganese sulfate / carbon nanotube liquid under constant temperature stirring at 70°C, wherein the volume ratio of the ammonium persulfate solution to the manganese sulfate / carbon nanotube liquid was 1:1. After reacting for 0.5 hours, the precipitate was collected by centrifugation, and the collected precipitate was dried in an oven at 150° C. for 12 hours to obtain a precursor. The above precursor, lithium carbonate, and ammonium dihydroge...

Embodiment 2

[0034]The carbon nanotubes were added into 100 ml of deionized water, and ultrasonically dispersed for 0.5 hour to make them uniformly dispersed to obtain a mixture of carbon nanotubes and deionized water. An appropriate amount of manganese sulfate is added to the above mixture to obtain a manganese sulfate / carbon nanotube liquid, and the concentration of manganese sulfate in the liquid is controlled to be 0.15 mol / L. Prepare 120 milliliters of 0.20 mol / L ammonium persulfate aqueous solution. Under constant temperature stirring at 70°C, the above-mentioned ammonium persulfate solution was added dropwise to the manganese sulfate / carbon nanotube liquid, wherein the volume ratio of the ammonium persulfate solution to the manganese sulfate / carbon nanotube liquid was 1.2 :1. After reacting for 1 hour, the precipitate was collected by centrifugation, and the collected precipitate was dried in an oven at 80° C. for 12 hours to obtain a precursor. Mix the above precursor with lithiu...

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Abstract

The invention provides a self-assembly preparation method of a spherical lithium manganese phosphate positive electrode material. Carbon nano tubes are compounded with the lithium manganese phosphate material, and the conductivity of the lithium manganese phosphate is improved by using ultrahigh conductivity of the carbon nano tubes. According to the method, the carbon nano tubes are taken as crystal nucleuses, spherical lithium manganese phosphate particles are self-assembled and formed from nano lithium manganese phosphate particles through in-situ preparation, and the carbon nano tubes are interpenetrated among spherical secondary particles. The invention also provides a compounded positive electrode material containing the self-assembly spherical lithium manganese phosphate and the carbon nano tubes prepared through the preparation method.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a self-assembly preparation method of lithium manganese phosphate positive electrode material and the lithium manganese phosphate positive electrode material prepared by the method. Background technique [0002] With the widespread use of lithium-ion secondary batteries in small electronic devices, electric vehicles and power storage, high specific energy, durability, high rate (fast charge and discharge capability), low cost, and safety have become the goals pursued by the development of lithium-ion batteries. As an important part of the lithium-ion battery, the cathode material has a great impact on the overall performance of the lithium-ion battery due to its electrochemical performance. Therefore, seeking high-performance cathode materials for lithium-ion batteries has become the key to current research on lithium-ion batteries. [0003] The commonly used cathode materia...

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
CPCB82Y30/00H01M4/364H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 毛文峰艾果黄向东裴锋朱敏魏建军胡倩倩董海勇刘凡洪晔梅骜
Owner GUANGZHOU AUTOMOBILE GROUP CO LTD
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