标题：TailorableElectrochemical Performance of Spinel Cathode Materials via In-situ Integratinga Layered Li2MnO3 Phase for Lithium-Ion Batteries
作者：Jianqing Zhao,* Hao Wang,Zhiqiang Xie, Sara Ellis, Xiaoxiao Kuai, Jun Guo, Xing Zhu, Ying Wang,* andLijun Gao*
论文摘要：Electrochemicalperformances of spinel cathode materials have been evaluated in a broad voltagerange of 2.0-4.8 V vs. Li/Li+ viain-situ integrating a layered Li2MnO3phase for high-voltage and high-capacity lithium ion batteries. Effects ofsintering temperatures on manipulatinghybrid spinel-layered structures have been systematically studied during thedecomposition of nonstoichiometric Li0.65Mn0.59Ni0.12Co0.13Oδmaterial. The spinel component undergoes a phase transition from an initial Li4Mn5O12-typeto a LiMn1.5Ni0.5O4-type spinel structure under high temperatures above 700 °C;meanwhile the content of layered Li2MnO3component is increased. Li2MnO3-stabilized spinel-layeredcathodes can deliver the discharge capacity more than 225 mAh/g at 0.1 C and exhibit outstanding capacityretentions above 90 % at 0.5 C (1 C = 250 mA/g) in an extended voltagerange between 2.0 and 4.8 V. In addition to clarify significant Li2MnO3impacts on improving cycling stability of spinel cathode materials, it isnoticeable that LiMn1.5Ni0.5O4-basedspinel materials can effectively suppress the electrochemical activationof the layered Li2MnO3up to 4.8 V. This work sheds lights on tailoring hybrid structures andmaximizing electrochemical performances of Li2MnO3-basedspinel-layered cathode materials for superior lithium ion batteries.