Stable cycling of LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)/lithium metal batteries enabled by synergistic tuning the surface stability of cathode/anode  

作　　者：Chunli Li Xinyu Zhang Zhuolin Yang Haijian Lv Tinglu Song Shijie Lu Yuxiang Zhang Tianwen Yang Fan Xu Feng Wu Daobin Mu 

机构地区：[1]School of Materials Science&Engineering,Beijing Key Laboratory of Environmental Science and Engineering,Beijing Institute of Technology,Beijing 100081,China [2]College of Chemistry,Beijing University of Chemical Technology,Beijing 100029,China [3]Shenzhen BTR New Energy Technology Institute Co.,Ltd,Shenzhen 518118,Guangdong,China

出　　处：《Journal of Energy Chemistry》2023年第12期342-350,I0009,共10页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(22209012,52072036);the fellowship of China Postdoctoral Science Foundation(2020M680374)。

摘　　要：Ni-rich layered oxides(LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2))show great potential in long-range and low-cost lithiumion batteries.However,due to the high surface sensitivity,their practical application is hindered by interfacial instability with electrolytes under high voltage for long cyclic life.Herein,by combining both firstprinciple calculations and time-of-flight secondary ion mass spectrometry(TOF-SIMS),a novel surface fluorinated reconstruction(SFR)mechanism is proposed to improve the interfacial stability under high voltage,which could effectively regulate the surface fluoride species to desensitize the LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)interface.We demonstrate here that by tuning the ratio of fluoride species,the LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)/Li battery could achieve excellent long-term and high voltage performance(163.5 mA h g^(-1)at 0.5 C for 300 cycles under 4.4 V),while the controlled sample decayed to 125.4 mA h g^(-1)after 300 cycles.Moreover,the favorable cross-talk effect induced by SFR further facilitates the incorporation of suitable amounts of Ni ions into the construction of stable solid electrolyte interface(SEI)layer for anode surface.Therefore,the ultra-long cycling stability under high voltage can be achieved by the robust cathode/electrolyte and Li/electrolyte interfaces,which results in excellent interfacial stability after long cycling.This work provides new insights into the surface design of cathode materials and improves the stability of the electrode-electrode interface under high voltage.

关 键 词：Ni-rich layered oxides Surface fluorinated reconstruction Interfacial stability TOF-SIMS Cross-talk effect 

分 类 号：TM912[电气工程—电力电子与电力传动]