Nano-structured Li1.3Al0.3Ti1.7(PO4)3 coated LiCoO2 enabling compatible interface with ultrathin garnet-based solid electrolyte for stable Li metal battery

Q. Sun, X. Chen, J. Xie, C. Huang, X. Xu, J. Tu, C. Shen, Y. Jin, K. Zhang, F. Chen, T. Zhu, X. Zhao, J. Cheng

Research output: Journal PublicationArticlepeer-review

1 Citation (Scopus)

Abstract

Garnet-type Li7La3Zr2O12 (LLZO) ceramics has been considered as an ideal solid-state electrolyte for Li metal cells because of its high ionic conductivity and relatively stable interface with Li. However, it is electrochemically incompatible with some high-voltage cathodes, e.g. LiCoO2. In this work, a nanoscale Li1.3Al0.3Ti1.7(PO4)3 (LATP) fast ion conductor was coated on LiCoO2 (only 1 wt% LATP), bringing obviously enhanced interfacial compatibility with a composite electrolyte composed of Al, Nb-codoped LLZO and polyethylene oxide (PEO). A free-standing, flexible and ultrathin (20 μm) electrolyte membrane was successfully fabricated by a facile and scalable route, even though with a high ceramics content (67 wt%). Quasi-solid-state coin and pouch-type Li cells were assembled with the LATP-coated LiCoO2 cathode, free-standing composite electrolyte and Li anode, together with soft interface modification by in-situ polymerization. The cells show stable cycling due to combined factors of enhanced electrode/electrolyte compatibility, ultrathin nature of the electrolyte membrane and the in-situ built soft interface. The pouch cells can be cycled for 300 cycles at 0.3 C and 60 °C with 80% retention. The pouch cells can endure abuse tests of bending, cutting and nail penetration. At a practical LiCoO2 loading of 3 mAh cm−2, the Li|LiCoO2 pouch cell still shows stable cycling with 90% retention after 100 cycles at 60 °C (0.2 C charge/0.5 C discharge). This work provides a practical method to fabricate high-performance solid-state Li cells.

Original languageEnglish
Article number100235
JournalMaterials Today Nano
Volume19
DOIs
Publication statusPublished - Aug 2022
Externally publishedYes

Keywords

  • In-situ polymerization
  • LATP-Coated LiCoO
  • Lithium metal battery
  • Quasi-solid-state electrolyte
  • Ultrathin garnet-based membrane

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry

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