Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202218151
Keywords
Amphiphilic Solvent; Anode-Free; Core-Shell-Solvation Electrolyte; Li-Metal Batteries; Ultra-Low Temperature
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Researchers have developed a new amphiphilic solvent that improves the performance of lithium metal batteries at low temperatures, enabling faster lithium ion transport and greater cycling stability.
Lithium metal batteries hold great promise for promoting energy density and operating at low temperatures, yet they still suffer from insufficient Li compatibility and slow kinetic, especially at ultra-low temperatures. Herein, we rationally design and synthesize a new amphiphilic solvent, 1,1,2,2-tetrafluoro-3-methoxypropane, for use in battery electrolytes. The lithiophilic segment is readily to solvate Li+ to induce self-assembly of the electrolyte solution to form a peculiar core-shell-solvation structure. Such unique solvation structure not only largely improves the ionic conductivity to allow fast Li+ transport and lower the desolvation energy to enable facile desolvation, but also leads to the formation of a highly robust and conductive inorganic SEI. The resulting electrolyte demonstrates high Li efficiency and superior cycling stability from room temperature to -40 degrees C at high current densities. Meanwhile, anode-free high-voltage cell retains 87 % capacity after 100 cycles.
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