Research On The Synthesis And Properties Of Spinel LiNi_xMn_2-xO₄

The energy and environment are two strategic problems of continuable development in human society; among them the energy is close related with exist of mankind society and development. The human society wants to realize and can keep on continuable development strategy, which must develop the new material and the new energy technique and protect the natural environment and the nature resources. Moreover, with the quick development of the modern electronics, which cause every kind of electronics product faced the small scaled turning continuously, reducing in weight turns the fast development in direction with the high performance, adding its people to strengthen continuously to the environmental protection consciousness, the urgent demand develops to the environment amity, more excellent and green environmental protection in function power supply, but the lithium ion battery is used as 21 centuries ideal energy causes the whole world values, it are widely used for their favorable advantages of high voltage, big specific capacity, long cycling life and non-pollution In lithium ion battery numerous cathodes material, spinel LiMn₂O₄ compound, because of its abundant resources, low cost, little pollution and simple synthesis process, was believed to be the most promising material of having replaced the LiCoO₂, but the LiMn₂O₄ exists the big capacity attenuation and poor cycle life etc, obstructs its commercial application. The reasons of the capacity attenuation have primarily to accompany with the Li⁺ ion embedding material on discharge process the effect of Jahn-Teller of the occurrence, the deliquescence of the cathode manganese in the material and the decomposition of the electrolyte.This thesis researched synthetic technical conditions for the LiNi_xMn_2-xO₄ material of the small batch quantity system. To optimize the synthetic process, we investigated the effect of four factors: calcinations temperature and calcinations time and pretreatment temperature and different row material rate of lithium and manganese and nickel, to optimize the material of LiNi_xMn_2-xO₄ of synthetic...