Affiliation:
1. Helmholtz Institute Ulm (HIU) Electrochemical Energy Storage Helmholtzstraße 11 89081 Ulm Germany
2. Karlsruhe Institute of Technology (KIT) P.O. Box 3640 76021 Karlsruhe Germany
3. ELETTRA Sincrotrone Trieste Basovizza 34012 Trieste Italy
4. Chemistry Department Sapienza University of Rome Piazzale Aldo Moro 5 00185 Rome Italy
Abstract
AbstractLithium metal is a promising anode material for next‐generation high‐energy‐density batteries but suffers from low stripping/plating Coulombic efficiency and dendritic growth particularly at sub‐zero temperatures. Herein, a poorly‐flammable, locally concentrated ionic liquid electrolyte with a wide liquidus range extending well below 0 °C is proposed for low‐temperature lithium metal batteries. Its all‐anion Li+ solvation and phase‐nano‐segregation solution structure are sustained at low temperatures, which, together with a solid electrolyte interphase rich in inorganic compounds, enable dendrite‐free operation of lithium metal anodes at −20 °C and 0.5 mA cm−2, with a Coulombic efficiency of 98.9 %. As a result, lithium metal batteries coupling thin lithium metal anodes (4 mAh cm−2) and high‐loading LiNi0.8Co0.15Al0.05O2 cathodes (10 mg cm−2) retain 70 % of the initial capacity after 100 cycles at −20 °C. These results, as a proof of concept, demonstrate the applicability of locally concentrated ionic liquid electrolytes for low‐temperature lithium metal batteries.
Funder
China Scholarship Council
Helmholtz Association
Subject
General Chemistry,Catalysis
Cited by
14 articles.
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