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

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...

AI Technical Summary

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 phase reaction synthesis method is to grind and mix lithium and cobalt, manganese or nickel compounds repeatedly, and then perform high-temperature roasting. To obtain the product, the operation process is simple, the raw materials are easy to obtain, and the crystal form of the product is good, but the reaction time is long (tens of hours to several days), the temperature is high (800-1200 ° C), and the temperature is the only controlling factor. The control is relatively difficult, the grain size of the product is uneven, the product consistency is poor, and the electrochemical activity is not high