With the merits of high energy density,environmental friendliness,and cost effectiveness,lithium-sulfur(Li-S)batteries are considered as one of the most promising next-generation electrochemical storage systems.Howeve...With the merits of high energy density,environmental friendliness,and cost effectiveness,lithium-sulfur(Li-S)batteries are considered as one of the most promising next-generation electrochemical storage systems.However,the notorious polysulfide shuttle effect,which results in low active material utilization and serious capacity fading,severely impedes the practical application of Li-S batteries.Utilizing various electrocatalysts to improve the polysulfide redox kinetics has recently emerged as a promising strategy to address the shuttle effect.Specially,the electronic structure of the electrocatalysts plays a decisive role in determining the catalytic activity to facilitate the polysulfide conversion.Therefore,reasonably modulating the electronic structure of electrocatalysts is of paramount significance for improving the electrochemical performance of Li-S batteries.Herein,a comprehensive overview of the fascinating strategies to tailor the electronic structure of electrocatalysts for Li-S batteries is presented,including but not limited to vacancy engineering,heteroatom doping,single atom doping,band regulation,alloying,and heterostructure engineering.The future perspectives and challenges are also proposed for designing high-efficient electrocatalysts to construct high-energy-density and long-lifetime Li-S batteries.展开更多
Aqueous zinc-ion batteries(AZIBs)have garnered extensive attention as promising energy storage systems because of the advantages of low cost and high safety.However,severe parasitic reactions at the Zn anode surface p...Aqueous zinc-ion batteries(AZIBs)have garnered extensive attention as promising energy storage systems because of the advantages of low cost and high safety.However,severe parasitic reactions at the Zn anode surface pose a huge challenge for the practical application of AZIBs,especially the intricate hydrogen evolution reaction(HER)and Zn dendrite growth.Herein,zwitterionic taurine with isoelectric point property is introduced as an electrolyte additive to construct a passivation layer by adapting its net charge to the microenvironment variation for stabilizing the Zn anode.The experimental and theoretical results reveal that taurine can not only in-situ form a hydrophobic and zincophilic layer on the Zn anode surface via the chelation with Zn^(2+)in the alkaline interfacial microenvironment,but also buffer the pH change dynamically,thus effectively suppressing the HER and Zn dendrite growth.As a consequence,the taurine-containing electrolyte enables a stable cycling of Zn anodes in symmetric Zn∥Zn cells for more than 1800 h under a deep plating/stripping condition(5 mA cm^(-2)and 5 mAh cm^(-2)).More encouragingly,the full cells coupled with the NH_(4)V_(4)O_(10)cathode can also exhibit an excellent capacity retention of 89.8%after 1200 cycles.This efficient strategy with an environmental adaptive additive offers valuable insights for mitigating the side reactions to achieve practical AZIBs and beyond.展开更多
文摘With the merits of high energy density,environmental friendliness,and cost effectiveness,lithium-sulfur(Li-S)batteries are considered as one of the most promising next-generation electrochemical storage systems.However,the notorious polysulfide shuttle effect,which results in low active material utilization and serious capacity fading,severely impedes the practical application of Li-S batteries.Utilizing various electrocatalysts to improve the polysulfide redox kinetics has recently emerged as a promising strategy to address the shuttle effect.Specially,the electronic structure of the electrocatalysts plays a decisive role in determining the catalytic activity to facilitate the polysulfide conversion.Therefore,reasonably modulating the electronic structure of electrocatalysts is of paramount significance for improving the electrochemical performance of Li-S batteries.Herein,a comprehensive overview of the fascinating strategies to tailor the electronic structure of electrocatalysts for Li-S batteries is presented,including but not limited to vacancy engineering,heteroatom doping,single atom doping,band regulation,alloying,and heterostructure engineering.The future perspectives and challenges are also proposed for designing high-efficient electrocatalysts to construct high-energy-density and long-lifetime Li-S batteries.
基金supported by the National Natural Science Foundation of China(12275189)Collaborative Innovation Center of Suzhou Nano Science&Technology+1 种基金the 111 ProjectJoint International Research Laboratory of Carbon-Based Functional Materials and Devices。
文摘Aqueous zinc-ion batteries(AZIBs)have garnered extensive attention as promising energy storage systems because of the advantages of low cost and high safety.However,severe parasitic reactions at the Zn anode surface pose a huge challenge for the practical application of AZIBs,especially the intricate hydrogen evolution reaction(HER)and Zn dendrite growth.Herein,zwitterionic taurine with isoelectric point property is introduced as an electrolyte additive to construct a passivation layer by adapting its net charge to the microenvironment variation for stabilizing the Zn anode.The experimental and theoretical results reveal that taurine can not only in-situ form a hydrophobic and zincophilic layer on the Zn anode surface via the chelation with Zn^(2+)in the alkaline interfacial microenvironment,but also buffer the pH change dynamically,thus effectively suppressing the HER and Zn dendrite growth.As a consequence,the taurine-containing electrolyte enables a stable cycling of Zn anodes in symmetric Zn∥Zn cells for more than 1800 h under a deep plating/stripping condition(5 mA cm^(-2)and 5 mAh cm^(-2)).More encouragingly,the full cells coupled with the NH_(4)V_(4)O_(10)cathode can also exhibit an excellent capacity retention of 89.8%after 1200 cycles.This efficient strategy with an environmental adaptive additive offers valuable insights for mitigating the side reactions to achieve practical AZIBs and beyond.
