Method for preparing anode material of lithium ion battery by spray refrigeration

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, lithium batteries, spraying manufacturing, etc., can solve the problems of uneven product grain size, difficult control of reactants, low electrochemical activity, etc., and achieve good powder crystallinity , reduce lithium evaporation loss, reduce the effect of temperature and sintering time

Inactive Publication Date: 2003-07-23
张文魁 +4
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Problems solved by technology

[0003] The positive electrode material of lithium ion battery generally adopts LiCoO 2 , LiNiO 2 and LiMn 2 o 4 Three major categories of lithium-transition metal composite oxides. Before the present invention was made, the preparation of lithium-ion battery electrode cathode materials mainly used solid-phase reaction method, molten salt impregnation method, sol-gel method, Pechini method, hot-pressing synthesis method, Hydrothermal synthesis method and co-precipitation method, etc., among which the solid phase reaction method is the main industrial production method at present. The solid phas

Method used

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Embodiment

[0021] Lithium acetate and cobalt nitrate were weighed at a ratio of Li / Co=1:1 (molar ratio). Firstly, the raw materials were thoroughly mixed by mechanical alloying ball milling, and then dissolved in deionized water to form a 0.5 mol / L solution. During the dissolution process, the solution was heated to 60°C, and the solution was fully stirred by mechanical stirring. After the raw materials were fully dissolved, it was cooled to room temperature.

[0022] Using liquid nitrogen as the freezing medium, the prepared raw materials are quickly sprayed into the liquid nitrogen by spraying, stirring while spraying, so that the mist droplets form frozen substances (precursors) in the liquid nitrogen and precipitate. After spraying, filter and separate.

[0023] After the precursor is separated, it is quickly moved into a desiccator pre-cooled with liquid nitrogen for vacuum drying. The drying time is 32 hours to remove the moisture in the frozen material.

[0024] The dried precurs...

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Abstract

Based on the molecular formula of the material of positive electrode of the lithium ion battery, the proportioning materials are prepared. The mechanical ball milling method is utilized to mix the materials evenly. With the deionized water being added, the said dmixture is stirred up to obtain the solution of the materials. Spraying the prepared solution to the refrigerating medium in liquid state with being stired up obtains the refrigeration object. With being filtered, the refrigeration object is quickly moved to the desiccator, which is freezed by liquid nitrogen in advance, so as to obtain the predecessor in fine crystal caused by vacuum drying. Nano anode material of lithium ion battery is obtained by sintering the predecessor in 3-10 hours at 500-1000 deg.C.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries refer to secondary batteries in which lithium-ion intercalation compounds are positive and negative electrodes. Compared with traditional secondary batteries such as cadmium-nickel and nickel-metal hydride batteries, lithium-ion batteries have a high working voltage (up to 3.6-3.7V) , high volume and mass specific energy, no memory effect, small self-discharge, long cycle life and environmental friendliness, etc., which meet the development requirements of miniaturization, light weight and high energy for the rapid development of mobile communication and information technology Since Japan's Sony Corporation developed lithium-ion batteries in 1990, there has been an upsurge in research and industrialization of lithium-ion batteries worldwide, and it has developed rapidly as...

Claims

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Application Information

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IPC IPC(8): C01D15/02H01M4/02H01M4/04H01M4/131H01M4/1391H01M4/48H01M4/50H01M4/505H01M4/52H01M4/525H01M10/052H01M10/36
CPCH01M4/505Y02E60/122H01M4/525H01M10/052H01M4/0419H01M4/1391H01M4/131Y02E60/10
Inventor 张文魁黄德欢涂江平杨慕杰张孝彬
Owner 张文魁
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