A solid-like dual-salt polymer electrolyte for Li-metal batteries capable of stable operation over an extended temperature range
Published in Energy Storage Materials, 2021
Recommended citation: Jing Yu, Jiapeng Liu, Xidong Lin, Ho Mei Law, Guodong Zhou, Stephen CT Kwok, Matthew J Robson, Junxiong Wu, and Francesco Ciucci*. (2021). "A solid-like dual-salt polymer electrolyte for Li-metal batteries capable of stable operation over an extended temperature range." Energy Storage Materials, 37, 609-618. https://pubs.rsc.org/en/content/articlelanding/2021/TA/D1TA02925H
| Solid polymer electrolytes (SPEs) and gel polymer electrolytes (GPEs) show great promise for the realization of commercial, high performance Li-metal batteries (LMBs). However, the interfacial and high-temperature instability of GPEs, and the low room-temperature ionic conductivity of SPEs still limit their practical implementation. This article presents a solid-like dual-salt polymer electrolyte (DSPE), consisting of coordinated solvents and thermally stable Li-salts within a temperature-resistant polymer matrix, as a promising new strategy for addressing these issues. The developed DSPE demonstrates high ionic conductivity of 0.16, 0.73, and 1.93 mS cm−1 at −20, 20, and 100 °C, respectively. Li | DSPE | LiFePO4 batteries using this DSPE deliver an initial discharge capacity of 151 mAh g−1 at 0.5C, a rate performance of 123 mAh g−1 at 3C, and excellent long-term stability with a retained capacity of 143 mAh g−1 after 500 cycles at 0.5C and 23 °C. Further, the battery shows stable cycling between −10 °C and 80 °C. This impressive electrochemical performance is ascribed to the high Li+ conductivity of the membrane, the stabilization of the Al current collector, and the formation of a robust, LiF-rich solid-electrolyte interphase containing conductive Li-B-O-based species. |
Recommended citation: Yu, J., Liu, J., Lin, X., Law, H.M., Zhou, G., Kwok, S.C., Robson, M.J., Wu, J. and Ciucci, F., 2021. A solid-like dual-salt polymer electrolyte for Li-metal batteries capable of stable operation over an extended temperature range. Energy Storage Materials, 37, 609-618.