A Numerical Study on Effects of Electrolyte Dry-out in Separators of Lithium-Ion Batteries

摘要

A variety of strategies to deal with the Lithium-ion batteries (LIBs) reaching the end-of-life (EOL) is being proposed, one of which is the secondary use applications such as the grid distribution system or the off-grid system. It is reported that within the EOL range, the capacity fade generally represents linear dependence on charge throughput and that SEI layer growth is the dominant factor. After prolonged cycling, however, the transition point to the nonlinearity of aging is observed and the LIBs capacity dropped suddenly, indicating that some other aging mechanisms. This rapid capacity drop phenomenon has been reported by experimental tests of other groups. Among many phenomena related to the rapid drops, electrolyte dry-out including decomposition of additives has been considered as one of the major factors.