Branch-Chain-Rich Diisopropyl Ether with Steric Hindrance Facilitates Stable Cycling of Lithium Batteries at − 20 °C

Abstract

Highlights Branch chain-rich diisopropyl ether (DIPE) was selected as co-solvent of low-temperature electrolyte for lithium metal battery. The introduction of DIPE improved the disorder of electrolyte and the branch chains from DIPE exclude other solvents from the Li+ solvent sheath, thereby achieving a rapid desolvation process. The electrolyte guaranteed a uniform Li stripping and deposition during cycling at both room temperature and low temperature and ensured stable cycling performance for Li||LFP cells over 650 cycles at − 20 °C.

Keywords

• Solvation structure
• Li metal battery
• Low temperature
• Steric hindrance
• Disorder