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A kind of preparation method of tetradecahedral nano-nickel cobalt lithium manganese oxide for positive electrode material of battery

A technology of lithium cobalt manganese oxide and battery positive electrode, which is applied in the field of preparation of nano-nickel cobalt lithium manganese oxide, which can solve the problems of affecting electrochemical performance and uniform mixing of difficult molecules, so as to improve power density and battery specific capacity and wide application foreground effect

Inactive Publication Date: 2018-03-20
UNIV FOR SCI & TECH ZHENGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, nickel cobalt lithium manganese oxide prepared by co-precipitation method has good electrochemical performance indicators, but it is difficult to achieve uniform mixing at the molecular level during the preparation process, which affects its electrochemical performance to a certain extent.

Method used

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  • A kind of preparation method of tetradecahedral nano-nickel cobalt lithium manganese oxide for positive electrode material of battery
  • A kind of preparation method of tetradecahedral nano-nickel cobalt lithium manganese oxide for positive electrode material of battery

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Embodiment 1

[0022] A method for preparing a tetradecahedron-shaped nano-nickel-cobalt lithium manganese oxide as a battery positive electrode material, characterized in that it comprises the following steps:

[0023] (1) Preparation of seed crystals by microwave method: Lithium nitrate, nickel nitrate, cobalt nitrate and manganese acetate were dissolved in deionized water respectively to form lithium ion solution, nickel ion solution, cobalt ion solution and manganese with a concentration of 0.05mol / L. ion solution, and then mix and stir the four solutions according to the molar ratio of lithium ion, nickel ion, cobalt ion and manganese ion in the ratio of 1:0.3:0.3:1.4, and then add urea aqueous solution with a concentration of 0.1mol / L , stirred for 30min to obtain a mixed solution, and the above mixed solution was heated by microwaves to obtain a seed solution; wherein, the microwave heating power was 5kW, the frequency was 2500MHz, the time was 4 minutes, and the mol ratio of urea to l...

Embodiment 2

[0027] A method for preparing a tetradecahedron-shaped nano-nickel-cobalt lithium manganese oxide as a battery positive electrode material, characterized in that it comprises the following steps:

[0028] (1) Preparation of seed crystals by microwave method: Lithium acetate, nickel acetate, cobalt acetate and manganese acetate were dissolved in deionized water respectively to form lithium ion solution, nickel ion solution, cobalt ion solution and manganese with a concentration of 0.07mol / L. ion solution, and then mix and stir the four solutions according to the molar ratio of lithium ion, nickel ion, cobalt ion and manganese ion in the ratio of 1:0.3:0.4:1.3, and then add 0.1mol / L aqueous urea solution , stirred for 30min to obtain a mixed solution, and the above mixed solution was heated by microwaves to obtain a seed crystal solution; wherein, the microwave heating power was 6kW, the frequency was 2500MHz, the time was 2 minutes, and the mol ratio of urea to lithium ions was ...

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Abstract

The invention discloses a preparation method of tetradecahedral nanometer lithium nickel manganese cobalt oxide. The method comprises preparing a lithium nickel manganese cobalt oxide crystal seeds through a microwave heating method, and preparing nanometer lithium nickel manganese cobalt oxide through a hydrothermal method. A fast heating effect of microwave is used to obtain fine and uniform crystal seeds, which are taken as crystal growth basic points for the subsequent hydrothermal step and are beneficial for obtaining products which are small in particle size and uniform in dimension. In the hydrothermal step, L-arginine or L-lysine is selected as a precipitating agent and a soft template to obtain nanometer lithium nickel manganese cobalt oxide having a tetradecahedral structure. The obtained tetradecahedral nanometer lithium nickel manganese cobalt oxide is taken as a positive electrode material of a lithium ion battery. Since the special shape affects ion diffusion and particle accumulation, the power density and battery specific capacity are improved. The method has bright application prospects.

Description

technical field [0001] The invention relates to a preparation method of nickel-cobalt lithium manganese oxide used as a positive electrode material of a battery, in particular to a preparation method of tetradecahedral nanometer nickel-cobalt lithium manganese oxide used as a positive electrode material of a battery. Background technique [0002] In recent years, with the rapid development of various electronic devices, the requirements for batteries are getting higher and higher, and lithium-ion batteries are regarded as the best new energy source. Lithium-ion batteries are inseparable from electric vehicles as large as notebooks and mobile phones. [0003] Lithium manganate (LiMn 2 o 4 ) has become one of the most promising cathode materials for lithium-ion batteries due to its high voltage, low price, abundant resources, and environmental friendliness, and has been widely studied and applied. However, the capacity of lithium manganese oxide has a large attenuation durin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525B82Y30/00
CPCB82Y30/00C01G53/006C01P2002/72C01P2004/03C01P2006/40H01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 左明鑫李杰刘林阴
Owner UNIV FOR SCI & TECH ZHENGZHOU