| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery having a long life, high input and output, and high capacity while securing safety.SOLUTION: In this lithium ion battery including a wound electrode group formed by winding a positive electrode, a negative electrode, and a separator, and an electrolyte in a battery container, the positive electrode has a collector, and a positive electrode mixture coated on both sides of the collector. The positive electrode mixture contains a mixed active material of spinel type lithium manganese oxide (sp-Mn), layered lithium-nickel-manganese-cobalt composite oxide (NMC), and olivine type composite lithium iron phosphate (LFP). The average particle diameters of them (D, D, D) satisfy D>D>D. The electrolyte contains at least one of 1,3-propene sultone (PRS) and lithium-bis-fluorosulfonyl imide (LiFSI), PRS is not less than 0.1 weight% and less than 10 weight%, and LiFSI is not less than 0.2M and less than 1.2M. |
