Solid-state batteries with excellent safety and high energy density display great potential as next-generation energy storage devices.However,few solid electrolytes simultaneously possess high ionic conductivity and g...Solid-state batteries with excellent safety and high energy density display great potential as next-generation energy storage devices.However,few solid electrolytes simultaneously possess high ionic conductivity and good chemical and electrochemical stability.Herein,pure argyrodite Li_(6.6)Si_(0.6)Sb_(0.4)S_(5)I electrolyte with high Li-ion conductivity(9.0 mS cm−1)and poor stability is successfully synthesized via the typical mechanochemical route.Interfacial instability of this electrolyte with different electrode materials is investigated.A highly conductive Li_(3)InCl_(6)electrolyte,with a wide voltage window and excellent chemical and electrochemical stability,active material,and conductive carbon are introduced in the battery configuration,resulting in superior electrochemical performances with the bare LiNi_(0.7)Mn_(0.2)Co_(0.1)O_(2)cathode.The corresponding battery delivers a discharge capacity of 162.1 mAh g^(−1)at 0.5C and maintains 83.8%of the capacity after 200 cycles at room temperature.Moreover,this battery with a cathode mass loading of 6.37 mg cm−2 displays discharge capacities of 197.5 and 73.4 mAh g^(−1)at the beginning when cycled at 0.5C and 0.1C under the operating temperature of 60 and−20℃,respectively.The battery also achieved superior stablecycling performances at both temperatures.Due to the fast ionic conductivity from Li_(6.6)Si_(0.6)Sb_(0.4)S_(5)I and high electronic conductivity from carbon in the cathode,the thick-electrode configurations with huge mass loadings of 50.96 and 76.43 mg cm^(−2)also exhibit good capacities and highly reversible cyclability.This work provides a guideline for enabling superior conducting sulfide electrolytes with poor stability in thick-electrode configuration solid-state batteries.展开更多
基金the National Key Research and Development Program(grant no.2021YFB2500200)the National Natural Science Foundation of China(grant no.52177214)+1 种基金the Department of Science and Technology of Guangdong Province(grant no.2017ZT07Z479)China Fujian Energy Devices Science and Technology Innovation Laboratory Open Fund(grant no.21C-OP202211)。
文摘Solid-state batteries with excellent safety and high energy density display great potential as next-generation energy storage devices.However,few solid electrolytes simultaneously possess high ionic conductivity and good chemical and electrochemical stability.Herein,pure argyrodite Li_(6.6)Si_(0.6)Sb_(0.4)S_(5)I electrolyte with high Li-ion conductivity(9.0 mS cm−1)and poor stability is successfully synthesized via the typical mechanochemical route.Interfacial instability of this electrolyte with different electrode materials is investigated.A highly conductive Li_(3)InCl_(6)electrolyte,with a wide voltage window and excellent chemical and electrochemical stability,active material,and conductive carbon are introduced in the battery configuration,resulting in superior electrochemical performances with the bare LiNi_(0.7)Mn_(0.2)Co_(0.1)O_(2)cathode.The corresponding battery delivers a discharge capacity of 162.1 mAh g^(−1)at 0.5C and maintains 83.8%of the capacity after 200 cycles at room temperature.Moreover,this battery with a cathode mass loading of 6.37 mg cm−2 displays discharge capacities of 197.5 and 73.4 mAh g^(−1)at the beginning when cycled at 0.5C and 0.1C under the operating temperature of 60 and−20℃,respectively.The battery also achieved superior stablecycling performances at both temperatures.Due to the fast ionic conductivity from Li_(6.6)Si_(0.6)Sb_(0.4)S_(5)I and high electronic conductivity from carbon in the cathode,the thick-electrode configurations with huge mass loadings of 50.96 and 76.43 mg cm^(−2)also exhibit good capacities and highly reversible cyclability.This work provides a guideline for enabling superior conducting sulfide electrolytes with poor stability in thick-electrode configuration solid-state batteries.
