Chemical Research in Chinese Universities ›› 2020, Vol. 36 ›› Issue (3): 329-342.doi: 10.1007/s40242-020-0116-0

• Reviews • Previous Articles     Next Articles

Garnet-type Solid-state Electrolyte Li7La3Zr2O12: Crystal Structure, Element Doping and Interface Strategies for Solid-state Lithium Batteries

GUO Sijie1,2, SUN Yonggang1,2, CAO Anmin1,2   

  1. 1. CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences(CAS), Beijing 100190, P. R. China;
    2. School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2020-04-16 Revised:2020-05-10 Online:2020-06-01 Published:2020-05-30
  • Contact: CAO Anmin E-mail:anmin_cao@iccas.ac.cn
  • Supported by:
    Supported by the Project of the Beijing National Laboratory for Molecular Sciences, China(No.BNLMS-CXXM-202010), the Beijing Natural Science Foundation, China(No.L182050), and the National Natural Science Foundation of China (No.51672282).

Abstract: The continuous development of solid-state electrolytes(SSEs) has stimulated immense progress in the development of all-solid-state batteries(ASSBs). Particularly, garnet-typed SSEs in formula of Li7La3Zr2O12(LLZO) are under intensive investigation to exploit their advantage in high lithium ions conductivity(>1 mS/cm), wide electrochemical window(>5 V), and good chemical electrochemical stability for lithium, which are critical factors to ensure a stable, and high performance ASSBs. This review will focus on the challenges related to LLZOs-based electrolyte, and update the recent developments in structural design of LLZOs, which are discussed in three major sections:(i) crystal structure and the lithium-ion transport mechanism of LLZO; (ii) single-site and multi-site doping of Li sites, La sites and Zr sites to enhance Li ions conductivity(LIC) and stability of LLZO; (iii) interface strategies between electrodes and LLZO to decrease interface area-specific resistance(ASR).

Key words: Solid-state electrolyte, Garnet, Li ions conductivity, Doping, Surface coating