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Solid Electrolytes Based on NASICON-Structured Phosphates for Lithium Metal Batteries
All-solid-state lithium batteries are a promising alternative to commercially available
lithium-ion batteries due to their ability to achieve high energy density, safety, and compactness. Electrolytes
are key components of all-solid-state batteries, as they are crucial in determining the batteries’
efficiency. Herein, the structure of LiM2(PO4)3 (M = Ti, Ge, Zr) and lithium-ion migration mechanisms
are introduced as well as different synthetic routes and doping (co-doping), and their influence on
conductivity is discussed. The effective methods of reducing electrolyte/electrode interface resistance
and improving ion-conducting properties are summarized. In addition, different polymer/NASICON
composites are considered. The challenges and prospects of practical applications of NASICON-type
lithium phosphates as electrolytes for all-solid-state batteries are discussed.