Abstract
Lithium-ion insertion/extraction at a single particle (10-30 μm in diam.) of LiMn2-xNixO4 (x = 0, 0.2, 0.5) was characterized by a microelectrode technique, in which a fine metal filament was manipulated to make electrical contact with the particle placed in 1 M LiClO4/ PC + EC solution. By using this technique, we can evaluate the correct current-potential behavior of LiMn2-xNixO4 without any dilution due to an organic binder and a conductive additive. The cyclic voltammetry (CV) was performed for the particles up to a high anodic potential limit of 5.2 V vs. Li/Li+. Undoped LiMn2O4 shows two current peaks around 4.1 V due to the redox reaction of Mn3+/4+ in the solid state phase, while the CV of Ni-doped LiMn2O4 was strongly deformed, showing new current peaks in a high potential region (∼ 4.7 V) at the expense of the 4.1 V wave. The 4.7 V wave would arise from the redox reaction of Ni2+/4+. The cyclability of LiMn2-xNixO4 was evaluated by multi-scan cyclic voltammetry.
Original language | English |
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Pages (from-to) | 1188-1193 |
Number of pages | 6 |
Journal | Denki Kagaku |
Volume | 66 |
Issue number | 12 |
DOIs | |
Publication status | Published - 1998 |
Keywords
- Doping Effect
- Lithium Ion Battery
- Microelectrode Technique
- Spinel LiMnO
ASJC Scopus subject areas
- Chemistry(all)