Doping And Industrialization Of Lithium Battery Cathode Material ?Layered LiMnO₂?

Lithium ion battery is one of the hottest research areas in the current energy field.As the main source of energy for lithium ion batteries,the cathode material is the key to the development of the lithium ion battery industry.LiMnO₂ has high research value because its wide range of raw materials,low price,low pollution and so on.Especially,it has excellent safety in overcharge.However,the industrialization process of cathode material is encumbered also by its high preparation cost,poor cycle performance and unstable structure.At present,it only in the laboratory research stage.Based on the hydrothermal method,this paper improved the hydrothermal method and did the dopping research,which provided a theoretical basis for the industrialization and electrochemical performance of LiMn O₂.The details were summarized as follows:?1?As the deply research of hydrothermal synthesis method of LiMnO₂.The optimal hydrothermal conditions were determined by changing the temperature variables and time variables.The output ratio of LiMnO₂ prepared by hydrothermal method was investigated by changing the quality of raw materials.?2?o-LiMn O₂ was prepared under Li/Mn<2:1 condition with the ammonia water added in the hydrothermal reaction.The preparation of LiMnO₂ is produced through hydrothermal amplification experiments,and explored the possibility of industrialization.?3?The effects of hydrothermal temperature and doping amount on the single and binary doping of Ce and Fe elements were studied.The experimental results show that:?1?With the increase of Li/Mn ratio as well as the increase of hydrothermal temperature and time,the preparation of LiMnO₂ was more pure.The optimal synthesis process was180?and 10h.?2?Ammonia can promote the preparation of LiMnO₂ by hydrothermal method under low Li/Mn ratio.The addition of ammonia in hydrothermal amplification experiments successfully prepared Li MnO₂ and provided a theoretical basis for the industrialization.?3?Hydrothermal temperature has a certain effect on the doping reaction and purity of product.The increase of the doping amount has a great influence on the doping reaction.The excessive doping amount will lead to the incomplete hydrothermal reaction,and the Mn₂O₃was remaining.The doping products were all granular and have a certain aggregation phenomenon with a strong adsorbability.