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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

查看全文 作　　者：Chunli [1,2]Li;Xinyu [1]Zhang;Zhuolin [1]Yang;Haijian [1]Lv;Tinglu [1]Song;Shijie [1]Lu;Yuxiang [1]Zhang;Tianwen [1]Yang;Fan [3]Xu;Feng [1]Wu;Daobin [1]Mu 高影响力作者 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高影响力机构 出　　处：《Journal of Energy Chemistry》索引2023年第12期,共10页高影响力期刊 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
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