Abstract
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.
Highlights
With the large-scale use of electrification and the development of energy storage science and technology, there is an urgent demand for a new generation of energy storage materials with high energy density, high safety and long cycle life
Argyrodite solid-state electrolyte (SSE) are attracting more and more attention because of their high ionic conductivity and their self-healing mechanism when reacting with lithium metal anode
Growth of lithium dendrites due to excessive local current density from voids created during lithium stripping/deposition when matched with argyrodite SSEs
Summary
With the large-scale use of electrification and the development of energy storage science and technology, there is an urgent demand for a new generation of energy storage materials with high energy density, high safety and long cycle life. The advent of the liquid lithium-ion battery (LIB) has increased the utilization and storage of electrical energy as a result of its high energy density and long cycle life. In order to solve the safety problem and improve the energy density of the battery, solid-state electrolyte (SSE) is proposed and researched intensively. The sulfide solid electrolyte structure is derived from oxide by replacing the oxygen element by sulfur, which expands its original ion radius and making the lithium ion transport channel larger (Minami et al, 2000). Since the discovery of binary sulfide solid electrolyte systems Li2S-GeS5,
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