Structural changes of LiMn2O4 spinel electrodes during electrochemical cycling
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- Structural changes of LiMn2O4 spinel electrodes during electrochemical cycling
- Cho, Jaephil; Thackeray, MM
- MANGANESE-DIOXIDE; LITHIUM BATTERIES; LI/LIMN2O4 CELLS; CATHODE; TEMPERATURE; CARBONATES; DISCHARGE; INSERTION; PHASE
- Issue Date
- ELECTROCHEMICAL SOC INC
- JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.146, no.10, pp.3577 - 3581
- Structural changes of LiMn2O4 spinel electrodes have been investigated in 4 V Li/LixMn2O4 cells by X-ray diffraction during prolonged electrochemical cycling between 4.5 and 3.4 V at room temperature. The capacity fade that is observed during cycling is attributed, at least partly, to disproportionation reactions at the particle surface of discharged LixMn2O4 electrodes, resulting in a soluble MnO component. The disproportionation reactions are described with respect to the Li-Mn-O phase diagram. The data support recent reports that Li2Mn2O4 can be formed at the electrode surface slightly above 3 V when cells are discharged and charged at high rates.
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