Abstract
FeS2 shows significant potential as cathode material for all-solid-state lithium batteries(ASSLBs)due to its high theoretical specific capacity,low cost,and environmental friendliness.However,the poor ion/electron conductivity and large volume variation effect of FeS2 inhibit its practical applications.Here,the influence of particle size of FeS2 on the corresponding sulfide-based solid-state batteries is carefully investigated by tuning FeS2 size.Moreover,low operating temperature is chosen to mitigate the large volume changes during cycling in the battery.S-FeS2 with smaller particle sizes delivers superior elec-trochemical performances than that of the larger L-FeS2 in Li5.5PS4.5Cl1.5-based ASSLBs under different operating temperatures.S-FeS2 shows stable discharge capacities during 50 cycles with a current density of 0.1 mA/cm2 under-20 ℃.When the current density rises to 1.0mA/cm2,it delivers an initial discharge capacity of 146.9 mAh/g and maintains 63％of the capacity after 100 cycles.This work contributes to con-structing ASSLBs enables excellent electrochemical performances under extreme operating temperatures.
基金项目
National Key Research and Development Program(2021YFB2400300)
National Natural Science Foundation of China(52177214)
China Fujian Energy Devices Science and Technology Innovation Laboratory Open Fund(21C-OP202211)
NETL
NSTL
万方数据