Stabilizing Solid Electrolyte-Anode Interface in Li-Metal Batteries by Boron Nitride-Based Nanocomposite Coating

Qian Cheng, Aijun Li, Na Li, Shuang Li, Amirali Zangiabadi, Tai De Li, Wenlong Huang, Alex Ceng Li, Tianwei Jin, Qingquan Song, Weiheng Xu, Nan Ni, Haowei Zhai, Martin Dontigny, Karim Zaghib, Xiuyun Chuan, Dong Su, Kai Yan*, Yuan Yang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

257 Citations (Scopus)

Abstract

Solid-state Li-metal batteries are promising to improve both safety and energy density compared to conventional Li-ion batteries. However, various high-performance and low-cost solid electrolytes are incompatible with Li, which is indispensable for enhancing energy density. Here, we utilize a chemically inert and mechanically robust boron nitride (BN) film as the interfacial protection to preclude the reduction of Li1.3Al0.3Ti1.7(PO4)3 (LATP) solid electrolyte by Li, which is validated by in situ transmission electron microscopy. When combined with ∼1–2 μm PEO polymer electrolyte at the Li/BN interface, Li/Li symmetric cells show a cycle life of over 500 h at 0.3 mA·cm−2. In contrast, the same configuration with bare LATP dies after 81 h. The LiFePO4/LATP/BN/PEO/Li solid-state batteries show high capacity retention of 96.6% after 500 cycles. This study offers a general strategy to protect solid electrolytes that are unstable against Li and opens possibilities for adopting them in solid-state Li-metal batteries.

Original languageEnglish
Pages (from-to)1510-1522
Number of pages13
JournalJoule
Volume3
Issue number6
DOIs
Publication statusPublished - 19 Jun 2019
Externally publishedYes

Keywords

  • boron nitride coating
  • chemical vapor deposition
  • in situ TEM
  • robust solid electrolyte/Li interface
  • solid electrolyte

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