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All-solid-state batteries based on sulfide solid electrolytes are potential candidates for applications such as electric vehicles. One of the challenges for the realization of the all-solid-state battery is the construction of composite electrodes with favorable lithium and electron conductive pathways. Here, we prepared an argyrodite type Li6PS5Cl-based solid electrolyte (LiPSCl)-coated graphite (Gr:LiPSCl, 64:36 weight ratio) by a dissolution-reprecipitation process and investigate its use as anode material for all-solid-state batteries. The addition of a carbon additive (acetylene black, 0.5, 1 and 2 weight ratio) to LiPSCl-coated graphite to form favorable electronic conductive pathways in the negative electrode was also investigated. The all-solid-state half-cell constructed using the argyrodite-coated graphite and carbon additive in 100:1 weight ratio exhibited a discharge capacity of 335 and 372 mAh g−1 at a C-rate of C/8 and at 25 °C and 100 °C, respectively. The electrochemical performance of the all-solid-state cell at different C-rates was evaluated at 100 °C. A relatively high discharge capacity of 276 mAh g−1 was retained at the high C-rate of 2C. Highlights: Argyrodite solid electrolyte coating on graphite by solution process. Argyrodite-coated graphite as anode material for all-solid-state lithium batteries. Graphite all-solid-state cells with high C-rate capability. [ABSTRACT FROM AUTHOR]

Lithium-ion batteries (LIBs) are widely used in portable electronic devices, electric vehicles and large scale energy storage, due to their considerable energy density, low cost and long cycle life. However, traditional liquid batteries suffer from safety problems such as leakage, thermal runaway and even explosion. Part of the issues are caused by lithium dendrites puncturing the liquid electrolyte during cycling. In order to achieve the objective of higher safety and energy density, a rigid solid-state electrolyte (SSE) is proposed instead of liquid electrolyte (LE). Thereinto, sulfide SSEs have received of the most attention due to their high ionic conductivity. Among all the sulfide SSEs, argyrodite SSEs are considered to be one of the most promising solid-state electrolytes due to their high ionic conductivity, high thermal stability and good processablity. On the other hand, lithium metal is an ideal material for anode because of its high specific energy, low potential and large storage capacity. However, interfacial problems between argyrodite SSEs and the anode (interfacial reactions, lithium dendrites, etc.) are considered to be important factors affecting their availability. In this mini review, we summarize the behavior, properties and problems arising at the interface between argyrodite SSEs and anode. Strategies to solve interface problems and stabilize interfaces in recent years are also discussed. Finally, a brief outlook about argyrodite SSEs is presented.

Lithium-ion batteries (LIBs) are widely used in portable electronic devices, electric vehicles and large scale energy storage, due to their considerable energy density, low cost and long cycle life. However, traditional liquid batteries suffer from safety problems such as leakage, thermal runaway and even explosion. Part of the issues are caused by lithium dendrites puncturing the liquid electrolyte during cycling. In order to achieve the objective of higher safety and energy density, a rigid solid-state electrolyte (SSE) is proposed instead of liquid electrolyte (LE). Thereinto, sulfide SSEs have received of the most attention due to their high ionic conductivity. Among all the sulfide SSEs, argyrodite SSEs are considered to be one of the most promising solid-state electrolytes due to their high ionic conductivity, high thermal stability and good processablity. On the other hand, lithium metal is an ideal material for anode because of its high specific energy, low potential and large storage capacity. However, interfacial problems between argyrodite SSEs and the anode (interfacial reactions, lithium dendrites, etc.) are considered to be important factors affecting their availability. In this mini review, we summarize the behavior, properties and problems arising at the interface between argyrodite SSEs and anode. Strategies to solve interface problems and stabilize interfaces in recent years are also discussed. Finally, a brief outlook about argyrodite SSEs is presented., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Pang, Gan, Xia, Huang, He and Zhang.)