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Title: Lithium Superoxide Hydrolysis and Relevance to Li–O 2 Batteries

Fundamental understanding of reactions of lithium peroxides and superoxides is essential for the development of Li–O 2 batteries. In this context, an investigation is reported of the hydrolysis of lithium superoxide, which has recently been synthesized in a Li–O 2 battery. Surprisingly, the hydrolysis of solid LiO 2 is significantly different from that of NaO 2 and KO 2. Unlike KO 2 and NaO 2, the hydrolysis of LiO 2 does not produce H 2O 2. Similarly, the reactivity of Li 2O 2 toward water differs from LiO 2, in that Li 2O 2 results in H 2O 2 as a product. The difference in the LiO 2 reactivity with water is due to the more exothermic nature of the formation of LiOH and O 2 compared with the corresponding reactions of NaO 2 and KO 2. Here, we also show that a titration method used in this study, based on reaction of the discharge product with a Ti(IV)OSO 4 solution, provides a useful diagnostic technique to provide information on the composition of a discharge product in a Li–O 2 battery.
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  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Hanyang Univ., Seoul (Republic of Korea)
  3. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Illinois, Chicago, IL (United States)
  4. Univ. of Illinois, Chicago, IL (United States)
  5. California State Univ. (CalState), Northridge, CA (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 121; Journal Issue: 18; Journal ID: ISSN 1932-7447
American Chemical Society
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
OSTI Identifier: