A wide-temperature superior ionic conductive polymer electrolyte for lithium metal battery

Zhiyuan Lin, Xianwei Guo, Zichun Wang, Boya Wang, Shiman He, Luke A. O'Dell, Jun Huang, Hong Li, Haijun Yu*, Liquan Chen

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Polymer electrolytes are one of promising candidates that can meet the demands of high safety and stability of high-energy lithium metal batteries. However, the practical applications of polymer electrolytes are usually limited by the low ionic conductivity, narrow electrochemical window and highly interfacial resistance. Here we designed a poly(vinyl ethylene carbonate) polymer electrolyte for polymer lithium metal battery by in-situ polymerization method. The new polymer electrolyte provides superior ionic conductivity with 2.1 × 10−3 S cm−1 at 25 °C, wide electrochemical window up to 4.5 V (vs. Li+/Li) and excellent interfacial compatibility to electrodes. The ions transports are mainly achieved from the coupling/decoupling between Li ions and oxygen atoms in C=O groups, partially from the coupling/decoupling between Li+ and oxygen atoms in C-O groups, and probably moving/exchange of Li+ between C=O and C–O groups in the process of segmental motions in high and low molecular polymers of polymer electrolyte. The lithium metal batteries with LiFePO4 cathode can deliver a high discharge capacity of ~165 mA h g−1 at 25 °C, and even ~104 mA h g−1 at −15 °C with current density of 0.1C. Therefore, the novel polymer electrolyte designed in this study is a promising candidate for high performances polymer lithium metal batteries.

Original languageEnglish
Article number104786
Pages (from-to)1-9
Number of pages9
JournalNano Energy
Volume73
DOIs
Publication statusPublished - Jul 2020
Externally publishedYes

Keywords

  • Poly(vinyl ethylene carboznate) polymer
  • Polymer electrolyte
  • Superior ionic conductivity
  • Li ions transports mechanism
  • In-situ polymerization

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