| 摘要 |
PROBLEM TO BE SOLVED: To provide a power storage device which uses a high-capacity negative electrode including Si and a nonaqueous electrolyte including, as an electrolytic salt, a salt including F as a constituent element, and enables the increase in coulomb efficiency.SOLUTION: A nonaqueous electrolyte power storage device comprises a positive electrode, a negative electrode, and a nonaqueous electrolyte. The negative electrode includes an Si-containing active material. The nonaqueous electrolyte includes, as an electrolytic salt, a salt (e.g. LiPF) including F as a constituent element. The nonaqueous electrolyte includes zeolite having pores of 5Å or smaller in diameter. The Si-containing active material includes Si and O as constituent elements. In addition, the Si-containing active material is coated with a conductive substance such as a carbon material. The negative electrode further includes a carbon material. The zeolite (e.g. molecular sieve) preferably has a pore size of 4-5Å. |
