Because of its high theoretical capacity,transition metal sulfides have always been regarded as promising anode materials for potas-slum-ion batteries.However,It is difficult for us to make use of transition metal sul...Because of its high theoretical capacity,transition metal sulfides have always been regarded as promising anode materials for potas-slum-ion batteries.However,It is difficult for us to make use of transition metal sulfides due to their low conductivity,poor ionic dif-fusivity,sluggish reaction kinetics and severe volume expansion.Here,we developed a novel carbon-coated CoSx@CNT material with carbon nanotubes inter-connected(CCS@CNT),which shows an excellent potassium storage performance with a specific capacity of 550 mA·h·g^(-1) under the current of 50 mA·g^(-1) and 296 mA·hg^(-1) at 1000 mA·g-1.The carbon layer can effectively alleviate volume ex-pansion during charging and discharging process.And this special structure of inter-connected hybrid networks with CNTs greatly improves the electron transport,ion diffusion coefficient and reaction kinetics of the material.展开更多
基金This study was supported by the National Natural Science Foundation of China(51772283,22072140)the Fundamental Research Funds for the Central Universities(WK2060000032).
文摘Because of its high theoretical capacity,transition metal sulfides have always been regarded as promising anode materials for potas-slum-ion batteries.However,It is difficult for us to make use of transition metal sulfides due to their low conductivity,poor ionic dif-fusivity,sluggish reaction kinetics and severe volume expansion.Here,we developed a novel carbon-coated CoSx@CNT material with carbon nanotubes inter-connected(CCS@CNT),which shows an excellent potassium storage performance with a specific capacity of 550 mA·h·g^(-1) under the current of 50 mA·g^(-1) and 296 mA·hg^(-1) at 1000 mA·g-1.The carbon layer can effectively alleviate volume ex-pansion during charging and discharging process.And this special structure of inter-connected hybrid networks with CNTs greatly improves the electron transport,ion diffusion coefficient and reaction kinetics of the material.
