Challenges and perspectives of NASICON-type solid electrolytes for all-solid-state lithium batteries

TLDR

NASICON-type solid electrolytes are prized for their high ionic conductivity, wide potential window, and chemical stability. This paper examines the key challenges of NASICON-type electrolytes in terms of ionic conductivity, electrode interface, and electrochemical stability. The authors analyze lithium‑ion migration in the NASICON 3‑D framework, review advances in conductivity and stability, and outline methods to lower interface impedance and enhance cycle life in all‑solid‑state lithium batteries. They summarize strategies to boost electrolyte conductivity and resolve electrode/electrolyte interface issues, and outline the future prospects for all‑solid‑state lithium batteries.

Abstract

NASICON-type (lithium super ionic conductor) solid electrolyte is of great interest because of its high ionic conductivity, wide potential window, and good chemical stability. In this paper, the key problems and challenges of NASICON-type solid electrolyte are described from the aspects of ionic conductivity, electrode interface, and electrochemical stability. Firstly, the migration mechanism of lithium ion is analyzed from the three-dimensional structure of NASICON-type solid electrolyte, and progress in the research of conductivity and stability is summarized. Then, the effective methods to reduce interface impedance and improve the cycle stability of all-solid-state lithium batteries (ASSLBs) with NASICON-type solid electrolyte are introduced. Finally, solutions to improve the conductivity of electrolytes and deal with electrode/electrolyte interface problems are summarized, and the development prospects of ASSLBs are discussed.