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High-performance Zn-graphite battery based on LiPF6 single-salt electrolyte with high working voltage and long cycling life

查看全文 作　　者：Yong [1]Wang;Luojiang [1]Zhang;Fan [1]Zhang;Xuan [1]Ding;Kyungsoo [1,2]Shin;Yongbing [1,2,3,4]Tang 高影响力作者 机构地区：[1]Functional Thin Films Research Center,Shenzhen Institutes of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,Guangdong,China;[2]University of Chinese Academy of Sciences,Beijing 100049,China;[3]Key Laboratory of Advanced Materials Processing&Mold,Ministry of Education,Zhengzhou University,Zhengzhou 450002,Henan,China;[4]Guangdong-Hong Kong-Macao Joint Laboratory of Human-Machine Intelligence-Synergy Systems,Shenzhen Institutes of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,Guangdong,China高影响力机构 出　　处：《Journal of Energy Chemistry》索引2021年第30卷第7期,共8页高影响力期刊 基　　金：financially supported by the Key-Area Research and Development Program of Guangdong Province(2019B090914003);the National Natural Science Foundation of China(51822210,51972329);Shenzhen Peacock Plan(KQTD2016112915051055);Shenzhen Science and Technology Planning Project(JCYJ20170818153404696);Natural Science Foundation of Guangdong Province(2018A050506066);China Postdoctoral Science Foundation(2020M672875)。 摘　　要：Zinc-ion batteries(ZIBs) are promising alternative energy storage devices to lithium-ion batteries owing to the merits of large abundance,high theoretical capacity,and environmental friendliness.However,critical challenges including low working voltage(below 2 V),low energy density as well as dendrites formation during long cycling caused by aqueous ZIB systems still hinder their practical applications.Herein,a high-voltage Zn-graphite battery(ZGB) based on a non-zinc ion single-salt electrolyte(2.5 M LiPF6 in carbonate solvent) is developed.Moreover,we surprisingly found that Zn^(2+) is dissolved in the LiPF6 single-salt electrolyte during resting and discharging processes,thus enabling reversible Zn plating/stripping mechanism on the Zn foil anode in the ZGB over the voltage window of 1.0-3.1 V.As a result,the ZGB achieves long-term cycling performance with a capacity retention of ~100% for over1200 cycles at 3 C and high Coulombic efficiency of ~100% in 1.0-3.1 V with no dendrites formation.Moreover,the ZGB exhibits a high working voltage of up to 2.2 V,thus contributing to both high energy density(up to 210 Wh kg^(-1)) and high power density(up to 1013 W kg^(-1)),superior than most reported ZIBs. 关 键 词：Zinc-ion battery Zn anode Graphite cathode LiPF6 single-salt electrolyte High voltage
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