Preparation And Properties Of Lithium-ion Battery Cathode Material LiNi_xMn_xCo_1-2xO₂System

With the emergence and rapid development of lithium-ion battery, lithium ion secondary battery is closely related with the development of mankind. From the lithium-ion batteries found so far, people have been studying how to improve to improve the existing battery level to reform the existing battery materials. Cathode materials for as the important part of lithium-ion battery it is an important factor to determine the battery performance is good or bad. Ternary cathode material is by far the most promising, it is most likely to be the production of materials for lithium-ion battery. Various reaction conditions on the performance of materials LiNi1/3Co1/3Mn1/3O2materials preparation process in this article, and optimize the best reaction conditions.This article was prepared by co-precipitation ternary precursor in the ternary precursor oxide with the lithium salt mixed with a high temperature solid the synthesis LiNi1/3Co1/3Mn1/3O2materials. At the precursor stage, the reaction pH and reaction temperature on the material tap density, surface morphology, microstructure, and the electrochemical cycling performance. Comprehensive analysis of the above test results concluded that:the pH=8, the room temperature ternary precursor oxides have good physical and chemical properties. Prepared according to the conditions precursor mixed with lithium temary materials after the performance test, the test results show that the more excellent performance of the samples obtained under the reaction conditions.Performance will be the best precursor mixed with lithium solid state reaction method after high-temperature sintering get LiNi1/3Co1/3Mn1/3O2material in this section to study the influence of different sintering temperature on the material properties. Test of the temary material sintered at different temperatures of the physical and chemical properties, including:surface morphology, microstructure and the electrochemical cycling performance. After analysis comparisons, the best performance of the sintering temperature is900℃ternary materials.This article on LiMnxNixCo1-2xO2system study, four different ratios of ternary materials prepared in the experimental process are as follows:a:x=0.5LiMn0.5Ni0.5O2, b:x=0.45LiMn0.45Ni0.45Co0.1O2, c:x=0.4LiMn0.4Ni0.4Co0.2O2, d:x=0.333LiMn1/3Ni1/3Co1/3O2. Four samples of the tests and comparative analysis of the results of comprehensive analysis of c:x=0.4LiMn0.4Ni0.4Co0.2O2sample is the most appropriate proportion of this system. Behind these four materials, button cell cycle V tests and electrochemical impedance spectra for redox relationship between the transition metal element in the charge-discharge process, a simple discussion.