氢氧化锰氧化法制备锰酸锂前驱体的研究

Preparation of precursor for LiMn_2O_4 cathode material by multiphase redox method

研究了以空气、氧气、双氧水、高锰酸钾作氧化剂,以氢氧化锰为锰源,通过氢氧化锰氧化法实现了在常压水溶液中合成锰酸锂前驱体的反应,探明了其形成机理。氧化剂氧化能力的强弱对氧化嵌锂具有重要影响;对于高锰酸钾,适当提高温度和合适的锂离子浓度有利于氧化嵌锂。该方法制备的锰酸锂,均匀性明显提高,微观组分差异基本消除,对推动我国锂离子电池正极材料产业的发展具有促进作用。

Abstract： The synthesis of spinel LiMn2O4 precursor was conducted in Mn （OH）2-H20-LiOH atmospheric aqueous solution system by Mn （OH）2 as manganese raw materials, using air, oxygen, hydrogen peroxide and potassium permanganate as oxidant. The formation mechanism was studied as well. The oxidizing capability of the oxidant has a great influence on the lithium content in the product. A suitable higher temperature and appropriate higher Li＋ concentration favored the formation of LiMn2O4precursor with higher Li content when using potassium permanganate as oxidant. The uniformity of LiMn2O4 prepared by this method is significantly improved, and the differences in micro-components of LiMn2O4 are almost eliminated, which has a positive role in promoting the development of China＇s lithium ion battery cathode material industry.