Dilute Aqueous-Aprotic Electrolyte Towards Robust Zn-Ion Hybrid Supercapacitor with High Operation Voltage and Long Lifespan  

作　　者：Shuilin Wu Yibing Yang Mingzi Sun Tian Zhang Shaozhuan Huang Daohong Zhang Bolong Huang Pengfei Wang Wenjun Zhang 

机构地区：[1]Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education&Hubei Key Laboratory of Catalysis and Materials Science,South-Central Minzu University,Wuhan 430074,People’s Republic of China [2]Department of Materials Science and Engineering,and Center of Super‑Diamond and Advanced Films,City University of Hong Kong,83 Tat Chee Avenue,Kowloon Tong,Hong Kong SAR,People’s Republic of China [3]Department of Applied Biology and Chemical Technology,The Hong Kong Polytechnic University,Hung Hom,Kowloon,Hong Kong SAR,People’s Republic of China [4]Key Laboratory of Photochemical Conversion and Optoelectronic Materials,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing,People’s Republic of China

出　　处：《Nano-Micro Letters》2024年第9期1-12,共12页纳微快报（英文版）

基　　金：supported by the National Nature Science Foundation of China(22209211 and 52172241);Hong Kong Research Grants Council(CityU 11315622);the research funds from South-Central Minzu University(YZZ22001);the National Key R&D Program of China(2021YFA1501101).

摘　　要：With the merits of the high energy density of batteries and power density of supercapacitors,the aqueous Zn-ion hybrid supercapacitors emerge as a promising candidate for applications where both rapid energy delivery and moderate energy storage are required.However,the narrow electrochemical window of aqueous electrolytes induces severe side reactions on the Zn metal anode and shortens its lifespan.It also limits the operation voltage and energy density of the Zn-ion hybrid supercapacitors.Using'water in salt'electrolytes can effectively broaden their electrochemical windows,but this is at the expense of high cost,low ionic conductivity,and narrow temperature compatibility,compromising the electrochemical performance of the Zn-ion hybrid supercapacitors.Thus,designing a new electrolyte to balance these factors towards high-performance Zn-ion hybrid supercapacitors is urgent and necessary.We developed a dilute water/acetonitrile electrolyte(0.5 m Zn(CF_(3)SO_(3))_(2)+1 m LiTFSI-H_(2)O/AN)for Zn-ion hybrid supercapacitors,which simultaneously exhibited expanded electrochemical window,decent ionic conductivity,and broad temperature compatibility.In this electrolyte,the hydration shells and hydrogen bonds are significantly modulated by the acetonitrile and TFSI-anions.As a result,a Zn-ion hybrid supercapacitor with such an electrolyte demonstrates a high operating voltage up to 2.2 V and long lifespan beyond 120,000 cycles.

关 键 词：Zn-ion supercapacitors Zn metal anode Electrolyte engineering Hydrogen bonds Solvation structures 

分 类 号：TM53[电气工程—电器] O646[理学—物理化学]