摘要
Solid-state lithium-metal batteries,with their high theoretical energy density and safety,are highly promising as a next-generation battery contender.Among the alternatives proposed as solid-state electrolyte,lithium-rich anti-perovskite(Li RAP)materials have drawn the most interest because of high theoretical Li^(+)conductivity,low cost and easy processing.Although solid-state electrolytes are believed to have the potential to physically inhibit the lithium dendrite growth,lithium-metal batteries still suffer from the lithium dendrite growth and thereafter the short circuiting.The voids in practical Li RAP pellets are considered as the root cause.Herein,we show that reducing the voids can effectively suppress the lithium dendrite growth.The voids in the pellet resulted in an irregular Li^(+)flux distribution and a poor interfacial contact with lithium metal anode;and hence the ununiform lithium dendrites.Consequently,the lithium-metal symmetric cell with void-reduced Li_(2)OHCl-HT pellet was able to display excellent cycling performance(750 h at 0.4 m A cm^(-2))and stability at high current density(0.8 m A cm^(-2)for 120 h).This study provides not only experimental evidence for the impact of the voids in Li RAP pellets on the lithium dendrite growth,but also a rational pellet fabrication approach to suppress the lithium dendrite growth.
基金
financially supported by the National Natural Science Foundation of China(22105095)
the Shenzhen Key Laboratory of Solid State Batteries(ZDSYS20180208184346531)
the Shenzhen Science and Technology Program(KQTD20200820113047086)
the Key Program of the National Natural Science Foundation of China(51732005)
the Guangdong Basic and Applied Basic Research Foundation(2020A1515111129)
the Guangdong Provincial Key Laboratory of Energy Materials for Electric Power(2018B030322001)
the Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices(2019B121205001)
the Guangdong Basic and Applied Basic Research Foundation(2021A1515012403)
the Basic Research Project of Science and Technology Innovation Commission of Shenzhen(JSGG20191129111001820)
the Key Laboratory of Energy Conversion and Storage Technologies(Southern University of Science and Technology)
the Ministry of Education
and Laboratory of Electrochemical Energy Storage Technologies,Academy for Advanced Interdisciplinary Studies(SUSTech)。
