The Stability of the Secondary Lithium Electrode in Tetrahydrofuran‐Based Electrolytes

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Abstract
The stability of tetrahydrofuran (THF)‐based electrolytes toward bulk and electroplated Li has been assessed. Those electrolytes incorporating were least reactive to Li at elevated temperature and gave the best cycling efficiencies. These efficiencies could be further improved by aging the electrolyte at 71°C and by the addition of or . Conversely, degraded the performance of the secondary Li electrode. Small quantities of Na+ and the variation of inert metal substrate had little, if any, effect on cycling efficiencies. Preelectrolyzing the electrolyte improved the cycling characteristics initially, but lengthy preelectrolysis resulted in electrolyte degradation. A recontact phenomenon, whereby previously isolated Li is recouped in subsequent cycles, was noted. The intervention of films is proposed to account for these observations.

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