Owing to uncontrolled and uneven electrodeposition and side reactions,Zn metal anodes inevitably suffer from issues such as dendrite growth,hydrogen evolution reactions,and surface passivation.This paper proposes an e...Owing to uncontrolled and uneven electrodeposition and side reactions,Zn metal anodes inevitably suffer from issues such as dendrite growth,hydrogen evolution reactions,and surface passivation.This paper proposes an efficient strategy to address these critical issues for realizing long-life and high-capacity aqueous zinc-ion hybrid supercapacitors(ZHSCs)by incorporating low-concentration(0.05 mol·L^(-1))redox RbI electrolyte additives.Specifically,rubidium cations have the ability to influence the negative Zn electrode surface via an electrostatic shielding mechanism,effectively protecting the electrode and minimizing undesired side reactions.In an aqueous solution,iodide anions actively solvate Zn^(2+)ions by stabilizing and modulating the solvation shell surrounding Zn^(2+).Moreover,the presence of iodide ions promotes the uniform deposition of Zn^(2+)species by selective adsorption onto the electrode surface.The synergistic effect of the electrostatic shielding and halogen ions enables the realization of aqueous symmetric Zn||Zn cells with a substantial cycle life of more than 2000 h Additionally,when applied to commercial activated carbon(AC),the proposed strategy facilitates the development of aqueous ZHSCs,exhibiting high specific capacitances(148.8 F·g^(-1)at 4 A·g^(-1))and ultra-long cycling stability.展开更多
Lithium metal batteries face serious safety challenges caused by flammable organic electrolytes and the growth of lithium dendrite.Trimethyl phosphate(TMP)is a promising alternative for flammable carbonate electrolyte...Lithium metal batteries face serious safety challenges caused by flammable organic electrolytes and the growth of lithium dendrite.Trimethyl phosphate(TMP)is a promising alternative for flammable carbonate electrolyte solvents owing to its nonflammable nature.But the low-concentration TMP-based electrolyte is unstable with the lithium metal anode.Here,a TMP-contained quasisolid electrolyte(PIQSE)with porous polyimide(PI)as supporting skeleton is designed.The cross-linking structure generated by UV curing in PIQSE can lock the reactive TMP solvent to reduce its contact with Li metal.Besides,the PI supporting skeleton with high-temperature resistance can significantly enhance the thermal stability of PIQSE.The combination of PI and TMP prompts the high ionic conductivity and excellent nonflammability of PIQSE.The LiFePO_(4)/Li cell using PIQSE shows superior electrochemical performance in a wide temperature range from-10 to 60°C.Furthermore,the cells with highvoltage cathode of LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)(NCM622)were matched with PIQSE exhibit good cyclic and rate performance.The NCM622/PIQSE/Li pouch cell was also fabricated.It exhibits a high discharge capacity of 182.9mAh.g^(-1),and can stably light up LEDs after folding and shearing tests,demonstrating broad prospects for highly safe energy storage applications.展开更多
基金financially supported by the National Natural Science Foundation of China(No.22209101)National Key R&D Program of China(No.2020YFA0710500)the Key Research and Development Program of Shaanxi(No.2022GXLH-01-23)for financial support。
文摘Owing to uncontrolled and uneven electrodeposition and side reactions,Zn metal anodes inevitably suffer from issues such as dendrite growth,hydrogen evolution reactions,and surface passivation.This paper proposes an efficient strategy to address these critical issues for realizing long-life and high-capacity aqueous zinc-ion hybrid supercapacitors(ZHSCs)by incorporating low-concentration(0.05 mol·L^(-1))redox RbI electrolyte additives.Specifically,rubidium cations have the ability to influence the negative Zn electrode surface via an electrostatic shielding mechanism,effectively protecting the electrode and minimizing undesired side reactions.In an aqueous solution,iodide anions actively solvate Zn^(2+)ions by stabilizing and modulating the solvation shell surrounding Zn^(2+).Moreover,the presence of iodide ions promotes the uniform deposition of Zn^(2+)species by selective adsorption onto the electrode surface.The synergistic effect of the electrostatic shielding and halogen ions enables the realization of aqueous symmetric Zn||Zn cells with a substantial cycle life of more than 2000 h Additionally,when applied to commercial activated carbon(AC),the proposed strategy facilitates the development of aqueous ZHSCs,exhibiting high specific capacitances(148.8 F·g^(-1)at 4 A·g^(-1))and ultra-long cycling stability.
基金financially supported by the Natural Science Basic Research Program of Shaanxi Province(No.2024JC-YBQN-0582)the Natural Science Foundation of Shaanxi Provincial Department of Education(No.23JK0702)+1 种基金Scientific Research fund of Xijing University(No.XJ23B05)the Fundamental Research Funds for the Central Universities(No.xzy012024005)。
文摘Lithium metal batteries face serious safety challenges caused by flammable organic electrolytes and the growth of lithium dendrite.Trimethyl phosphate(TMP)is a promising alternative for flammable carbonate electrolyte solvents owing to its nonflammable nature.But the low-concentration TMP-based electrolyte is unstable with the lithium metal anode.Here,a TMP-contained quasisolid electrolyte(PIQSE)with porous polyimide(PI)as supporting skeleton is designed.The cross-linking structure generated by UV curing in PIQSE can lock the reactive TMP solvent to reduce its contact with Li metal.Besides,the PI supporting skeleton with high-temperature resistance can significantly enhance the thermal stability of PIQSE.The combination of PI and TMP prompts the high ionic conductivity and excellent nonflammability of PIQSE.The LiFePO_(4)/Li cell using PIQSE shows superior electrochemical performance in a wide temperature range from-10 to 60°C.Furthermore,the cells with highvoltage cathode of LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)(NCM622)were matched with PIQSE exhibit good cyclic and rate performance.The NCM622/PIQSE/Li pouch cell was also fabricated.It exhibits a high discharge capacity of 182.9mAh.g^(-1),and can stably light up LEDs after folding and shearing tests,demonstrating broad prospects for highly safe energy storage applications.
