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- Title
Effects of current densities on the formation of LiCoO/graphite lithium ion battery.
- Authors
He, Yan-Bing; Li, Baohua; Yang, Quan-Hong; Du, Hongda; Kang, Feiyu; Ling, Guo-Wei; Tang, Zhi-Yuan
- Abstract
The activation characteristics and the effects of current densities on the formation of a separate LiCoO and graphite electrode were investigated and the behavior also was compared with that of the full LiCoO/graphite batteries using various electrochemical techniques. The results showed that the formation current densities obviously influenced the electrochemical impedance spectrum of Li/graphite, LiCoO/Li, and LiCoO/graphite cells. The electrolyte was reduced on the surface of graphite anode between 2.5 and 3.6 V to form a preliminary solid electrolyte interphase (SEI) film of anode during the formation of the LiCoO/graphite batteries. The electrolyte was oxidized from 3.95 V vs Li/Li on the surface of LiCoO to form a SEI film of cathode. A highly conducting SEI film could be formed gradually on the surface of graphite anode, whereas the SEI film of LiCoO cathode had high resistance. The LiCoO cathode could be activated completely at the first cycle, while the activation of the graphite anode needed several cycles. The columbic efficiency of the first cycle increased, but that of the second decreased with the increase in the formation current of LiCoO/graphite batteries. The formation current influenced the cycling performance of batteries, especially the high-temperature cycling performance. Therefore, the batteries should be activated with proper current densities to ensure an excellent formation of SEI film on the anode surface.
- Subjects
GRAPHITE; LITHIUM-ion batteries; STORAGE batteries; ELECTRODES; ELECTROLYTES
- Publication
Journal of Solid State Electrochemistry, 2011, Vol 15, Issue 9, p1977
- ISSN
1432-8488
- Publication type
Article
- DOI
10.1007/s10008-010-1220-8