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Insight into the interaction between Ni-rich LiNi0.8Co0.1Mn0.1O2 cathode and BF4--introducing electrolyte at 4.5V high voltage

查看全文 作　　者：Guangyuan [1]Lan;Hebing [1]Zhou;Lidan [1]Xing;Jiawei [1]Chen;Zifei [1]Li;Rude [1]Guo;Yanxia [1]Che;Weishan [1]Li 高影响力作者 机构地区：[1]National and Local Joint Engineering Research Center of MPTES in High Energy and Safety LIBs, Engineering Research Center of MTEES (Ministry of Education), Research Center of BMET (Guangdong Province), Key Laboratory of ETESPG (GHEI), School of Chemistry and Environment, South China Normal University高影响力机构 出　　处：《Journal of Energy Chemistry》索引2019年第28卷第12期,共9页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(21573080);the Guangdong Program for Support of Top-notch Young Professionals(2015TQ01N870);Distinguished Young Scholar(2017B030306013);the Science and Technology Planning Project of Guangdong Province(Grant no.2017B090901020) 摘　　要：Owing to the high specific capacity and high voltage,Ni-rich(LiNi0.8Co0.1Mn0.1O2,LNCM811)cathode has been considered as one of the most promising candidate cathode materials for next generation lithium ion batteries,whereas severe capacity fading greatly hinders its practical application.Notably,the compatibility of Ni-rich materials with LiBF4-containing electrolyte has not yet been realized.Herein,1 M LiPF6-based electrolyte with introducing 2 M LiBF4 is proposed to dramatically improve the cyclic stability of high voltage LNCM811/Li half-cell.Addition of high concentrated LiBF4 improves the moisture stability of electrolyte,which hinders the generation of harmful by-product HF,resulting in improved interfacial stability of LNCM811.Lithium plating/stripping reaction of Li/Li symmetric cell confirms that the enhanced cyclic stability is ascribed to the improved interfacial stability of LNCM811 instead of lithium electrode.Morphology and composition characterization results reveal that LiBF4 participates in the CEI film-forming reaction,resulting in suppressed oxidation of electrolyte and interfacial structural destruction of LNCM811. 关 键 词：LiNi0.8Co0.1Mn0.1O2 4.5 V high voltage Interfacial stability LiBF4 co-salt CEI film
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