锂离子电池用分级结构富锂锰基固溶体材料的合成与异质结构设计

项目名称： 锂离子电池用分级结构富锂锰基固溶体材料的合成与异质结构设计

项目编号： No.51472032

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 苏岳锋

作者单位： 北京理工大学

项目金额： 83万元

中文摘要： 富锂锰基固溶体材料xLi2MnO3o(1-x)LiMO2（0

中文关键词： 锂离子电池；富锂锰基固溶体材料；异质结构；分级结构

英文摘要： Lithium-enriched manganese-based solid solution series xLi2MnO3o(1-x)LiMO2（0<x<1，M = transition metal）are a new generation of cathode materials based on Li2MnO3 that delivers a very high capacity (ca. 250-300mAh/g) for lithium-ion batteries. In order to overcome the existing defects such as low initial coulombic efficiency, accelerated capacity fade and voltage decay under high voltage, and intrinsic poor rate capability, this project focuses on shape-controlled synthesis of lithium-rich cathode materials with a morphology of nanoplates, and will investigate the reaction mechanism of the synthetic process that makes for crystal growth in the direction perpendicular to plane electrochemically active for Li+ transportation; develop designing of heterostructure including layered host materials composited with rocksalt phase or coated with spinel phase, find out the effect of spinel phase on improving interface mass transfer and Li+ transportation, as well as the mechanism of rocksalt phase on stabilizing the activated Li2MnO3 phase; study on the synthesis process of nano-plate/micro-sphere hierarchical structured lithium-enriched material. And thus, based on the strategy listed above, we can develop a hierarchical structured lithium-enriched material with better rate capability, more steady cycle performance, and higher initial coulombic efficiency, which ensures its application in the next generation of high energy density lithium-ion battery.

英文关键词： Lithium-ion battery;Lithium-enriched manganese-based solid solution;Heterostructure;Hierarchical structure