The Salt Matters: Enhanced Reversibility of Li-O<sub>2</sub> Batteries with a Li[(CF<sub>3</sub> SO<sub>2</sub> )(n-C<sub>4</sub> F<sub>9</sub> SO<sub>2</sub> )N]-Based Electrolyte.
basic_science · Level V
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- Record sourced from PubMed, PMID 29131411.
- Also identified by DOI 10.1002/adma.201704841.
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Abstract
The safety hazards and cycle instability of lithium metal anodes (LMA) constitute significant barriers to progress in lithium metal batteries. This situation is worse in Li-O<sub>2</sub> batteries because the LMA is prone to be chemically attacked by O<sub>2</sub> shuttled from the cathode. Notwithstanding, efforts on LMA are much sparse than those on the cathode in the realm of Li-O<sub>2</sub> batteries. Here, a novel lithium salt of Li[(CF<sub>3</sub> SO<sub>2</sub> )(n-C<sub>4</sub> F<sub>9</sub> SO<sub>2</sub> )N] (LiTNFSI) is reported, which can effectively suppress the parasitic side reactions and dendrite growth of LMA during cycling and thereby significantly enhance the overall reversibility of Li-O<sub>2</sub> batteries. A variety of advanced research tools are employed to scrutinize the working principles of the LiTNFSI salt. It is revealed that a stable, uniform, and O<sub>2</sub> -resistive solid electrolyte interphase is formed on LMA, and hence the "cross-talk" between the LMA and O<sub>2</sub> shuttled from the cathode is remarkably inhibited in LiTNFSI-based Li-O<sub>2</sub> batteries.