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Cobaltosic oxide coated and modified nickel-doped lithium manganate and preparation method thereof

A technology of three cobalt tetroxide and lithium heteromanganate, applied in electrochemical generators, electrical components, battery electrodes, etc., can solve the problems of poor cyclability and high temperature, and achieve the effect of preventing dissolution and improving cycle performance and high temperature performance.

Inactive Publication Date: 2017-01-25
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of Jahn-Teller effect and Mn dissolution in the existing pure lithium manganate material during the charge-discharge cycle, resulting in poor cycle performance and high temperature, and propose a modified nickel-doped manganese coated with tricobalt tetroxide Lithium acid and preparation method thereof

Method used

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  • Cobaltosic oxide coated and modified nickel-doped lithium manganate and preparation method thereof
  • Cobaltosic oxide coated and modified nickel-doped lithium manganate and preparation method thereof
  • Cobaltosic oxide coated and modified nickel-doped lithium manganate and preparation method thereof

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Embodiment

[0019] Weigh 0.5245g lithium hydroxide monohydrate, 1.0507g citric acid, 0.0933g nickel acetate tetrahydrate and 6.0353g manganese acetate tetrahydrate, add 40mL deionized water and stir for half an hour, transfer to an oil bath and heat to 80 ℃, adjust the pH to 7.5 and keep it warm for a period of time until a brown oily gel is obtained, then dry the gel in microwave to obtain a white dry gel, and then grind it to obtain a precursor powder. The xerogel was ground into powder and placed in a tube furnace in an air atmosphere at a heating rate of 5°C to 750°C for 10 hours, then cooled naturally to obtain a nickel-doped lithium manganate material. The nickel-doped lithium manganese oxide material obtained above is mixed with cobalt acetate tetrahydrate in a certain metering ratio, and ground. Among them, nickel-doped lithium manganate is 0.7070 g, and cobalt acetate tetrahydrate is 0.1085 g. Add the resulting mixture to anhydrous ethanol and sonicate for 30 minutes, then place...

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Abstract

The embodiment of the invention discloses modified lithium manganate coated based on a sol-gel method, and a preparation method thereof. The preparation method comprises the steps of preparing a nickel-doped lithium manganate material with the sol-gel method by firstly, weighing lithium hydroxide monohydrate, nickel acetate tetrahydrate, manganese acetate tetrahydrate and citric acid according to a certain stoichiometric ratio, adding deionized water, and uniformly mixing, wherein the citric acid is used as a chelating agent; mixing the prepared nickel-doped lithium manganate with cobalt acetate tetrahydrate; grinding, and calcining in a tube furnace to obtain a cobaltosic oxide coated and modified nickel-doped lithium manganate composite material. The composite material prepared by using the technical scheme has excellent cycling stability, rate capability and high-temperature performance.

Description

technical field [0001] The invention belongs to the field of battery key materials and technologies, and in particular relates to a modification of a positive electrode material of a lithium ion battery and a preparation method thereof, in particular to a modified nickel-doped lithium manganese oxide coated with tricobalt tetroxide and a preparation method thereof. Background technique [0002] Spinel LiMn 2 o 4 Due to its wide source, low cost, simple synthesis process, and environmental friendliness, it is considered to be the most promising cathode material for lithium-ion batteries. However, LiMn 2 o 4 The material is prone to Jahn-Teller effect and Mn dissolution during the charge-discharge cycle, resulting in irreversible capacity fading, which greatly limits its commercial application. [0003] For LiMn 2 o 4 The Jahn-Teller effect and the dissolution of Mn in the process of material circulation, studies have shown that doping transition metal elements with the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 徐云龙王清清罗磊
Owner EAST CHINA UNIV OF SCI & TECH
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