Quasi-solid-state battery hits 99.98% efficiency, suppresses dendrites, and boosts cycle life

Researchers at HKUST and Shanghai Jiao Tong University developed a single-crystalline 3D borate covalent organic framework, COF-303, for use as a quasi-solid-state electrolyte in lithium metal batteries.

Its ordered ion channels reduce grain-boundary resistance, improve lithium transport, and help suppress lithium dendrite growth.

The material delivered 99.98% Coulombic efficiency and 8.1 mS cm−1 ionic conductivity in testing.

Full cells with LiFePO4 showed stable performance over 600 cycles, while symmetric cells ran for more than 2,000 hours.

The advance could improve the safety, lifetime, and charging efficiency of lithium metal batteries for EVs and grid storage.