Technical CommentsChemistry

Response to Comment on “Cycling Li-O2 batteries via LiOH formation and decomposition”

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Science  06 May 2016:
Vol. 352, Issue 6286, pp. 667
DOI: 10.1126/science.aad8843

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Lithium-oxygen (Li-O2) batteries cycle reversibly with lithium iodide (LiI) additives in dimethoxyethane (DME) to form lithium hydroxide (LiOH). Viswanathan et al. argue that because the standard redox potential of the four-electron (e) reaction, 4OH ↔ 2H2O + O2 + 4e, is at 3.34 V versus Li+/Li, LiOH cannot be removed by the triiodide ion (I3). However, under nonaqueous conditions, this reaction will occur at a different potential. LiOH also reacts chemically with I3 to form IO3, further studies being required to determine the relative rates of the two reactions on electrochemical charge.

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