多孔球状结构Li1.2Co0.4Mn0.4O2富锂材料的制备及电化学性能研究

为了提高电极材料的稳定性和安全性能,本文从综合结构设计出发,制备出纳米/微米分级结构的Li1.2Co0.4Mn0.4O2富锂材料,这种材料兼具微米材料和纳米材料的双重优点,其整体结构为微米结构,可以提高材料的稳定性,同时这种材料表面又是由纳米材料组合而成,能够缩短锂离子扩散路径。Li1.2Co0.4Mn0.4O2的首次放电比容量为226.8 mA h g^-1,电流密度为100 mA g^-1循环50圈后,放电比容量为137.95 mA h g^-1,容量保持率为80.07%,表现出良好的电化学性能。

Preparation of Li1.2Co0.4Mn0.4O2-rich Material with Porous Spherical Structure and Study on its Electrochemical Properties

In order to improve the stability and safety performance of the electrode material,the structure design is carried out to prepare a nano/micro-graded Li1.2Co0.4Mn0.4O2 lithium-rich material.This material has the dual advantages of micro and nano materials.The overall structure is a micron structure,which can improve the stability of the material,and the surface of the material is composed of nano materials,which can shorten the lithium ion diffusion path.The first discharge specific capacity of Li1.2Co0.4Mn0.4O2 is 226.8 mAh•g−1,the current density is 100 mAg−1 after 50 cycles,the discharge specific capacity is 137.95 mAhg−1,and the capacity retention rate is 80.07%,showing a good electrochemical performance.