Understanding De-protonation Induced Formation of Spinel Phase in Li-rich Layered Oxides for Improved Rate Performance

作     者：李保云 李广社 张丹 范建明 冯涛 李莉萍 

作者机构：State Key Laboratory of Inorganic Synthesis & Preparative Chemistry Jilin University Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences 

出 版 物：《Chinese Journal of Structural Chemistry》 (结构化学（英文）)

年 卷 期：2018年第37卷第11期

页      面：1723-1736页

核心收录：

学科分类：0817[工学-化学工程与技术] 08[工学] 

基　　金：financially supported by NSFC(No.21571176 21611530688 21771171 21671077 and 21025104) 

主　　题：protonation and de-protonation layered-spinel composites rate performance conduction electron 

摘      要：Constructing layered-spinel composites is important to improve the rate performance of lithium-rich layered ***,up to now,the effect of microstructure of composites on the rate performance has not been well *** this study,a series of samples were prepared by a simple protonation and de-protonation for the pristine layered material(LiMnNiCoO)obtained by sol-gel *** characterizations of XRD,Raman and oxidation-reduction potentials of charge-discharge curves demonstrated that these samples after de-protonation are layered-spinel *** these composites were tested as a cathode of lithium-ion batteries,the sample treated with 0.1 M of nitric acid exhibited higher discharge capacities at each current density than that of other *** outstanding rate performance is attributed to the high concentration of conduction electron resulting from the low average valence state(44.2%of Ni)as confirmed by its high conductivity(1.124×10??mat39800Hz)and ambient temperature magnetic susceptibility(8.40×10emu/Oe?mol).This work has a guiding significance for the synthesis of high rate performance of lithium battery cathode materials.