Abstract
Lithium-metal oxides with a high formal Li2O content, such as Li5FeO4 (5Li2O center dot Fe2O3) and a Li2MnO3 center dot LiFeO2 composite ({Li2O center dot MnO2}center dot{Li2O center dot Fe(2)O(3)g) have been explored as electrocatalysts for primary and rechargeable Li-O-2 cells. Activation occurs predominantly by Li2O removal, either electrochemically or chemically by acid-treatment. Superior electrochemical behavior is obtained if activation occurs by acid-treatment; Li2MnO3 center dot LiFeO2 catalysts provide 2516 mAh/g (carbon) corresponding to 931 mAh/g (electrocatalyst + carbon) during the initial discharge. The reaction is reasonably reversible during the early cycles. The approach has implications for designing electrocatalysts that participate through electrochemical Li2O extraction/reformation reactions, offering exceptionally high capacities. (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3555366] All rights reserved.
Original language | English |
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Pages (from-to) | A64-A66 |
Number of pages | 3 |
Journal | Electrochemical and Solid-State Letters |
Volume | 14 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2011 |
Keywords
- MANGANESE OXIDES
- ION BATTERIES
- ELECTROLYTES
- SOLVENTS
- CATHODE
- MN