Non-flammable solvent-free liquid polymer electrolyte for lithium metal batteries

Guo-Rui Zhu, Qin Zhang, Qing-Song Liu, Qi-Yao Bai, Yi-Zhou Quan, You Gao, Gang Wu () and Yu-Zhong Wang ()
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Guo-Rui Zhu: College of Chemistry, Sichuan University
Qin Zhang: College of Chemistry, Sichuan University
Qing-Song Liu: College of Chemistry, Sichuan University
Qi-Yao Bai: College of Chemistry, Sichuan University
Yi-Zhou Quan: College of Chemistry, Sichuan University
You Gao: College of Chemistry, Sichuan University
Gang Wu: College of Chemistry, Sichuan University
Yu-Zhong Wang: College of Chemistry, Sichuan University

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract As a replacement for highly flammable and volatile organic liquid electrolyte, solid polymer electrolyte shows attractive practical prospect in high-energy lithium metal batteries. However, unsatisfied interface performance and ionic conductivities are two critical challenges. A common strategy involves introducing organic solvents or plasticizers, but this violates the original intention of security design. Here, an electrolyte concept called liquid polymer electrolyte without any small molecular solvents is proposed for safe and high-performance batteries, based on the design of a room-temperature liquid-state brush-like polymer as the sole solvent of lithium salts. This liquid polymer electrolyte is non-flammable and exhibits high ionic conductivity (1.09 $$\times$$ × 10−4 S cm−1 at 25 °C), significant lithium dendrite suppression, and stable long-term cycling over a wide operating temperature range ( ≥ 1000 cycles at 60 °C and 90 °C). Moreover, the pouch cell can resist thermal abuse, vacuum environment, and mechanical abuse. This electrolyte and design strategy are expected to provide enlightening ideas for the development of safe and high-performance polymer electrolytes.

Date: 2023
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DOI: 10.1038/s41467-023-40394-8

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