High-voltage solid-sate electrolytes for advanced lithium-ion batteries

Abstract

Solid-state batteries (SSBs) are highly attractive on account of their high energy density and good safety. In high-voltage and high-current conditions, however, the interface reactions, structural changes, and decomposition of the electrolyte impede the transmission of lithium ions in all-solid-state lithium batteries (ASSLBs), significantly reducing the charging and discharging capacity and cycling stability of the battery and therefore restricting its practical applications. The main content of review is to conduct an in-depth analysis of the existing problems of solid-state batteries from the aspects of interface reactions, material failure, ion migration, and dendrite growth, and points out the main factors influencing the electrochemical performance of ASSLBs. Additionally, the compatibility and ion conduction mechanisms between polymer electrolytes, inorganic solid electrolytes, and composite electrolytes and the electrode materials are discussed. Furthermore, the perspectives of electrode materials, electrolyte properties, and interface modification are summarized and prospected, providing new optimization directions for the future commercialization of high-voltage solid-state electrolytes.