Abstract
The electrochemical stability of single particles of cathode materials (LiMn2O4, Li1.10Cr0.048Mn1.852O4, LiCoO2 and LiNi0.85Co0.15O2) was investigated by means of a microelectrode technique at 25 °C and 50 °C. The cycle stability was evaluated by multi-cyclic voltammetry. LiMn2O4 showed good cycle stability in LiClO4/propylene carbonate (PC)+ethylene carbonate (EC) and LiBF4/PC+EC solutions even at 50 °C. On the contrary, in LiPF6/PC+EC, significant capacity fading during charge-discharge was observed at 50 °C. The cycle stability of LiMn2O4 in the latter solution was improved by partial substitution of Mn by Cr and Li. Regarding LiCoO2, its cycle life in LiClO4/PC+EC at 50 °C was unsatisfactory when the potential was scanned between 3.60 and 4.30 V. On the other hand, LiCoO2 retained 90% of its capacity when the potential scan was limited to 4.00 V. LiNi0.85Co0.15O2 showed similar trend at 50 °C.
Original language | English |
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Pages (from-to) | 109-115 |
Number of pages | 7 |
Journal | Journal of Power Sources |
Volume | 90 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2000 Sep |
Event | The 1999 International Symposium on Rechargeable - Kyoto, Jpn Duration: 1999 Nov 14 → 1999 Nov 16 |
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering