The development of high-performance and low-cost cathode materials is of great significance for the progress in lithium-ion batteries.The use of Co and even Ni is not conducive to the sustainable and healthy developme...The development of high-performance and low-cost cathode materials is of great significance for the progress in lithium-ion batteries.The use of Co and even Ni is not conducive to the sustainable and healthy development of the power battery industry owing to their high cost and limited resources.Here,we report LiMn_(2)O_(4)integrated with coating and doping by Sn self-segregation.Auger electron energy spectrum and soft X-ray absorption spectrum show that the coating is Sn-rich LiMn_(2)O_(4),with a small Sn doping in the bulk phase.The integration strategy can not only mitigate the Jahn–Teller distortion but also effectively avoid the dissolution of manganese.The as-obtained product demonstrates superior high initial capacities of 124 mAh·g^(-1)and 120 mAh·g^(-1)with the capacity retention of 91.1%and 90.2%at 25℃and55℃after 50 cycles,respectively.This novel material-processing method highlights a new development direction for the progress of cathode materials for lithium-ion batteries.展开更多
Static rechargeable zinc-iodine(Zn-I_(2))batteries are superior in safety,costeffectiveness,and sustainability,giving them great potential for large-scale energy storage applications.However,the shuttle effect of poly...Static rechargeable zinc-iodine(Zn-I_(2))batteries are superior in safety,costeffectiveness,and sustainability,giving them great potential for large-scale energy storage applications.However,the shuttle effect of polyiodides on the cathode and the unstable anode/electrolyte interface hinder the development of Zn-I_(2)batteries.Herein,a self-segregated biphasic electrolyte(SSBE)was proposed to synergistically address those issues.The strong interaction between polyiodides and the organic phase was demonstrated to limit the shuttle effect of polyiodides.Meanwhile,the hybridization of polar organic solvent in the inorganic phase modulated the bonding structure,as well as the effective weakening of water activity,optimizing the interface during zinc electroplating.As a result,the Zn-I_(2)coin cells performed a capacity retention of nearly 100%after 4000 cycles at 2 mA cm^(-2).And a discharge capacity of 0.6 Ah with no degradation after 180 cycles was achieved in the pouch cell.A photovoltaic energy storage battery was further achieved and displayed a cumulative capacity of 5.85 Ah.The successfully designed energy storage device exhibits the application potential of Zn-I_(2)batteries for stationary energy storage.展开更多
基金supported by the International Science&Technology Cooperation of China(No.2019YFE0100200)the National Natural Science Foundation of China(No.53130202)the Basic Research Program of Shanxi Province,China(No.20210302123259)。
文摘The development of high-performance and low-cost cathode materials is of great significance for the progress in lithium-ion batteries.The use of Co and even Ni is not conducive to the sustainable and healthy development of the power battery industry owing to their high cost and limited resources.Here,we report LiMn_(2)O_(4)integrated with coating and doping by Sn self-segregation.Auger electron energy spectrum and soft X-ray absorption spectrum show that the coating is Sn-rich LiMn_(2)O_(4),with a small Sn doping in the bulk phase.The integration strategy can not only mitigate the Jahn–Teller distortion but also effectively avoid the dissolution of manganese.The as-obtained product demonstrates superior high initial capacities of 124 mAh·g^(-1)and 120 mAh·g^(-1)with the capacity retention of 91.1%and 90.2%at 25℃and55℃after 50 cycles,respectively.This novel material-processing method highlights a new development direction for the progress of cathode materials for lithium-ion batteries.
基金National Natural Science Foundation of China,Grant/Award Numbers:52372252,51932011Newly Introduced Scientific Research Start-up Funds for High-tech Talents,Grant/Award Number:DD11409024Fundamental Research Funds for the Central Universities of Central South University,Grant/Award Number:2024ZZTS0642。
文摘Static rechargeable zinc-iodine(Zn-I_(2))batteries are superior in safety,costeffectiveness,and sustainability,giving them great potential for large-scale energy storage applications.However,the shuttle effect of polyiodides on the cathode and the unstable anode/electrolyte interface hinder the development of Zn-I_(2)batteries.Herein,a self-segregated biphasic electrolyte(SSBE)was proposed to synergistically address those issues.The strong interaction between polyiodides and the organic phase was demonstrated to limit the shuttle effect of polyiodides.Meanwhile,the hybridization of polar organic solvent in the inorganic phase modulated the bonding structure,as well as the effective weakening of water activity,optimizing the interface during zinc electroplating.As a result,the Zn-I_(2)coin cells performed a capacity retention of nearly 100%after 4000 cycles at 2 mA cm^(-2).And a discharge capacity of 0.6 Ah with no degradation after 180 cycles was achieved in the pouch cell.A photovoltaic energy storage battery was further achieved and displayed a cumulative capacity of 5.85 Ah.The successfully designed energy storage device exhibits the application potential of Zn-I_(2)batteries for stationary energy storage.
