SOLID ELECTROLYTE INTER-PHASE ON GRAPHITE ANODES IN Li-ION BATTERIES

Fundamental understanding of processes that occur at the electrode/electrolyte interface during the charging and discharging is prerequisite for developing advanced Li-ion battery systems with good performance. The irreversible capacity loss, cycle life and high rate charge/discharge property of Li-ion battery will be influenced by interfacial reactions including Li-ion insertion/extraction, electrolyte decomposition as well as the formation of a solid electrolyte inter-phase (SEI) layer on the surface of electrode. Recent studies on SEI film of graphite negative electrodes in Li-ion batteries were discussed in this paper. The formation process, composition, thickness, and the function of SEI on graphite anode material were generally analyzed in detail. Furthermore, this article here emphasized the current knowledge of formation mechanism of SEI, because it could help us creating Li-ion batteries with better performance.