Regulating the electrolyte solvation structure by weakening the solvating power of solvents for stable lithium metal batteries

Jia Lin Liang, Shu Yu Sun, Nan Yao, Zhao Zheng, Qian Kui Zhang, Bo Quan Li, Xue Qiang Zhang*, Jia Qi Huang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Rational electrolyte design is essential for stabilizing high-energy-density lithium (Li) metal batteries but is plagued by poor understanding on the effect of electrolyte component properties on solvation structure and interfacial chemistry. Herein, regulating the solvation structure in localized high-concentration electrolytes (LHCE) by weakening the solvating power of solvents is proposed for high-performance LHCE. 1,3-dimethoxypropane (DMP) solvent has relatively weak solvating power but maintains the high solubility of Li salts, thus impelling the formation of nanometric aggregates where an anion coordinates to more than two Li-ions (referred to AGG-n) in LHCE. The decomposition of AGG-n increases the LiF content in solid electrolyte interphase (SEI), further enabling uniform Li deposition. The cycle life of Li metal batteries with DMP-based LHCE is 2.1 times (386 cycles) as that of advanced ether-based LHCE under demanding conditions. Furthermore, a Li metal pouch cell of 462 Wh kg−1 undergoes 58 cycles with the DMP-based LHCE pioneeringly. This work inspires ingenious solvating power regulation to design high-performance electrolytes for practical Li metal batteries.[Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)3620-3627
Number of pages8
JournalScience China Chemistry
Volume66
Issue number12
DOIs
Publication statusPublished - Dec 2023

Keywords

  • 1, 3-dimethoxypropane
  • lithium metal anodes
  • nanometric aggregates
  • pouch cells
  • solvation structure

Fingerprint

Dive into the research topics of 'Regulating the electrolyte solvation structure by weakening the solvating power of solvents for stable lithium metal batteries'. Together they form a unique fingerprint.

Cite this