Physics

Geology

Electrode

Organic chemistry

Lithium battery

Dissolution

Endocrinology

Ionic conductivity

Engineering

Physical chemistry

Composite material

Power (physics)

Ionic bonding

Inorganic chemistry

Ethylene carbonate

Eutectic system

Chemistry

Metallurgy

Materials science

Plating (geology)

Deep eutectic solvent

Lithium (medication)

Battery (electricity)

Quantum mechanics

Electrolyte

Chemical engineering

Polymer

Electrochemistry

Medicine

Geophysics

Microstructure

Angewandte Chemie International Edition

The deployment of high-energy-density lithium-metal batteries has been greatly impeded by Li dendrite growth and safety concerns originating from flammable liquid electrolytes. Herein, we report a stable quasi-solid-state Li metal battery with a deep eutectic solvent (DES)-based self-healing polymer (DSP) electrolyte. This electrolyte was fabricated in a facile manner by in situ copolymerization of 2-(3-(6-methyl-4-oxo-1,4-dihydropyrimidin-2-yl)ureido)ethyl methacrylate (UPyMA) and pentaerythritol tetraacrylate (PETEA) monomers in a DES-based electrolyte containing fluoroethylene carbonate (FEC) as an additive. The well-designed DSP electrolyte simultaneously possesses non-flammability, high ionic conductivity and electrochemical stability, and dendrite-free Li plating. When applied in Li metal batteries with a LiMn2 O4 cathode, the DSP electrolyte effectively suppressed manganese dissolution from the cathode and enabled high-capacity and a long lifespan at room and elevated temperatures.

Deep‐Eutectic‐Solvent‐Based Self‐Healing Polymer Electrolyte for Safe and Long‐Life Lithium‐Metal Batteries