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spinel Li Mn_(2)O_(4)integrated with coating and doping by Sn self-segregation

International Journal of Minerals,Metallurgy and Materials 2022年第5期29卷 909-916页

作者： Huaifang Shang Dingguo Xia Key Laboratory of Magnetic Molecules and Magnetic Information Materials(Ministry of Education) School of Chemistry and Material ScienceShanxi Normal UniversityTaiyuan 030031China Beijing Key Laboratory of Theory and Technology for Advanced Batteries Materials School of Materials Science and EngineeringPeking UniversityBeijing 100871China

The development of high-performance and low-cost cathode materials is of great significance for the progress in lithium-ion *** use of Co and even Ni is not conducive to the sustainable and healthy development of the power battery industry owing to their high cost and limited ***,we report LiMn_(2)O_(4)integrated with coating and doping by Sn *** electron energy spectrum and soft X-ray absorption spectrum show that the coating is Sn-rich LiMn_(2)O_(4),with a small Sn doping in the bulk *** integration strategy can not only mitigate the Jahn–Teller distortion but also effectively avoid the dissolution of *** as-obtained product demonstrates superior high initial capacities of 124 mAh·g^(-1)and 120 mAh·g^(-1)with the capacity retention of 91.1%and 90.2%at 25℃and55℃after 50 cycles,*** novel material-processing method highlights a new development direction for the progress of cathode materials for lithium-ion batteries.

关键词： spinel lithium manganate coating and doping tin self-segregation high capacity good stability

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Mitigating the Jahn-Teller distortion driven by the spin-orbit coupling of lithium manganate cathode

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Journal of Energy Chemistry 2022年第9期31卷 379-387,I0011页

作者： Shu Zhang Hongyi Chen Jun Chen Shouyi Yin Yu Mei Lianshan Ni Andi Di Wentao Deng Guoqiang Zou Hongshuai Hou Xiaobo Ji State Key Laboratory of Powder Metallurgy College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083HunanChina Department of Materials and Environmental Chemistry Stockholm UniversityStockholm 10691Sweden

spinel LiMn_(2)O_(4)is recognized as one of the most competitive cathode candidates for lithium-ion batteries ascribed to environmentally benign and rich ***,the wholesale application of LiMn_(2)O_(4)is predominately plagued by its severe capacity degradation,mainly associated with the innate Jahn-Teller ***,single-crystalline LiMn_(2)O_(4)with Eu^(3+) doping is rationally designed to mitigate the detrimental Jahn-Teller distortion by tuning the chemical environment of MnO_(6) octahedra and accommodating localized electron,based on the unique aspheric flexible 4f electron orbit of rare-earth metal ***,the stretching of MnO_(6) octahedron stemmed from the Jahn-Teller effect in Eu-doped LiMn_(2)O_(4)is effectively suppressed,confirmed by theoretical ***,the structural stability of the material has been significantly enhanced due to the robust Mn–O band coherency and weakened phase transition,proved by synchrotron radiation absorption spectrum and operando X-ray *** corresponding active cathode manifests superior long-cycle stability after 300 loops at 2C and displays only a 0.011%capacity drop per cycle even at *** this,this modification tactic sheds new light on achieving superior long-cycle performances by suppressing distortion in various cathode materials.

关键词： spinel lithium manganate Spin-orbit coupling Jahn-Teller distortion Cathode material

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