Abstract
Li2S-P2S5-type inorganic solid electrolytes with cation and/or anion doping are considered to be promis-ing candidates for all-solid-state batteries(ASSBs),due to their high ionic conductivity and electrochem-ical performances.However,compositional tuning of Li2S-P2S5 type inorganic solid electrolytes without doping has not been fully studied.In this work,Li-rich Li7P2S8I solid electrolyte was prepared with com-positional tuning by high energy ball mill process.The crystalline nature and the structural character-istics of the prepared solid electrolytes were studied with several physiochemical techniques.The effect of compositional tuning and the associated limitations were analyzed by laser Raman spectroscopy and solid-nuclear magnetic resonance spectroscopy(NMR)analysis techniques.The prepared Li-rich Li7P2S8I solid electrolyte exhibited higher ionic conductivity(6.27 mS cm-1)than the bare Li7P2S8I solid elec-trolyte(5.16 mS cm-1).Further,the prepared Li7.1P2S8.1I0.9 solid electrolyte is highly stable against lithium metal anode and is stable up to 600 charge-discharge cycles.Thus,the fabricated ASSB using Li-rich Li7P2S8I solid electrolyte exhibited excellent cycle stability of 97％specific capacity retention with less interfacial reaction.Electrochemical impedance spectroscopy and the laser Raman spectroscopy analy-sis after galvanostatic charge-discharge cycling confirmed the electrochemical stability of Li-rich Li7P2S8l solid electrolyte.
基金项目
National Research Foundation of Korea(NRF)grant(NRF-2019R1A6A1A11053838)
Ministry of Education,Science and Technology(MEST)of the Korean Government()
NETL
NSTL
万方数据