Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9760341 | Journal of Power Sources | 2005 | 5 Pages |
Abstract
The influence of the electrolyte in lithium-ion batteries on the reversible capacity and long-term cycling stability is not only determined by the salt and the film-forming solvent, but also, to a minor extent, by the co-solvent that is usually comprised in order to ensure suitable physical properties. Electrolytes containing three different isomers of butyl methyl carbonates were investigated in both, graphite half- and full-cells in order to determine the influence of co-solvent chain branching on the electrochemical performance. The reversible capacity obtained in SFG44 graphite (TIMCAL Ltd.) half-cells is higher for electrolytes with branched co-solvents and increases as the chain branching gets closer to the carbonate group. The long-term cycling stability, investigated in SLP30 graphite (TIMCAL Ltd.) half-cells, shows the same trend. The overall effect is rather small, but still perceivable in a full-cell set-up (SFG44/LiCoO2). A possible pathway of interaction of the co-solvent via the structure and composition of the solid electrolyte interphase (SEI) is proposed.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Jens Vetter, Hilmi Buqa, Michael Holzapfel, Petr Novák,