Abstract
The microelectrode technique was applied to investigate the electrochemical properties of LiC1-xMnxO2 (x = 0, 0.01, 0.05, 0.2, or 0.5) synthesized using the citrate process. From the X-ray diffraction measurements, an expansion of the c-axis and a decrease in the crystal size of the materials were observed on substitution of Mn into LiCoO2. In the electrochemical measurements, the high-speed cyclic voltammogram for the Mn-substituted materials gave one set of peaks at 3.9 V vs. Li/Li+. The apparent chemical diffusion constant (Dapp) of LiCo0.8Mn0.2O2 obtained from the potential step experiment was 6.4 × 10-8 cm2/s, which is larger than that of LiCoO2. The increase in Dapp is attributable to the expansion of the c-axis and/or the decrease in the crystal size. In addition, the increase in Mn substitution up to 20% lead to an improvement in the kinetic reversibility and the cycle stability of LiCoO2.
Original language | English |
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Pages (from-to) | 205-209 |
Number of pages | 5 |
Journal | Journal of Solid State Electrochemistry |
Volume | 4 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2000 Jan 1 |
Keywords
- Cycle stability
- High speed voltammetry
- Kinetic reversibility
- Lithium cobalt oxide
- Manganese substitution
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Electrochemistry
- Electrical and Electronic Engineering