| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte electricity storage element improved in durability against repeated use, having high capacity (discharge capacity and electricity storage capacity) and excellent output characteristics, and capable of improving weight energy density.SOLUTION: A nonaqueous electrolyte electricity storage element comprises: a positive electrode including a positive electrode active material capable of inserting and desorbing anions; a negative electrode including a negative electrode active material; and a nonaqueous electrolyte containing a nonaqueous solvent, an electrolyte salt including a halogen atom, and a compound having a site capable of bonding to anions including a halogen atom. The compound having a site capable of bonding to anions including a halogen atom is preferably tris(pentafluorophenyl)borane (TPFPB) or tris(hexafluoroisopropyl)borate (THFIPB). |
