Energy Storage Science and Technology ›› 2020, Vol. 9 ›› Issue (5): 1472-1488.doi: 10.19799/j.cnki.2095-4239.2020.0135

• Energy Storage Materials and Devices • Previous Articles     Next Articles

Progress of NASICON-structured Li1+xAlxTi2-x(PO4)3 (0 x 0.5) solid electrolyte

Jie WU(), Xiaobiao JIANG, Yang YANG, Yongmin WU, Lei ZHU, Weiping TANG()   

  1. State Key Laboratory of Space Power Technology, Shanghai Institute of Space Power-Sources, Shanghai 200245, China
  • Received:2020-04-07 Revised:2020-05-01 Online:2020-09-05 Published:2020-09-08
  • Contact: Weiping TANG E-mail:WuJieMYB@163.com;tangwp@sina.cn

Abstract:

The widespread application of lithium-ion batteries greatly improves peoples’ quality of life. However, due to the use of flammable organic liquid electrolytes, there is a safety risk with traditional lithium-ion batteries and their energy density is limited. The development of all-solid-state batteries using solid electrolytes is expected to solve these problems. With high ionic conductivity, good environmental stability, and mild synthesis conditions, the NASICON-structured solid electrolyte Li1+xAlxTi2-x(PO4)3 (LATP, 0≤x≤0.5) is a fairly promising solid electrolyte. This paper first reviews the progress of LATP according to four aspects: Its crystal structure, ionic diffusion mechanism, synthetic methods, and methods to improve its ionic conductivity. In addition, with the electrochemical instability and high interface impedance of the LATP solid electrolyte against electrode active materials limiting its application in all-solid-state lithium batteries, the solutions to these key issues are summarized in the second part of the paper. Finally, it is emphasized that interface problems are the main challenge limiting the application of LATP solid electrolytes in all-solid-state batteries, necessitating the development of better strategies to further optimize the interface between LATP and electrode active materials.

Key words: LATP solid electrolyte, ionic diffusion mechanism, ionic conductivity, synthetic methods, electrode/solid electrolyte interface

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