Patent ID: 9184446
Filing Date: 2015-11-10
Classification: H01M,Y02E,Y02T

Abstract:
1. A lithium ion secondary battery, comprising a positive electrode having a current collector and a positive electrode composite layer provided on the current collector, wherein the secondary battery satisfies each of the following conditions: the collector contains a metal element A as a main component thereof; the positive electrode composite layer contains a two-phase compound containing lithium as a positive electrode active material, wherein the two-phase compound is an olivine compound represented by the general formula: Li the positive electrode composite layer further contains as an additive a fluoride or phosphate salt having a metal element B having a higher ionization tendency than the metal element A in the form of a divalent or monovalent cation, wherein the metal element B is at least one selected from the group consisting of Ca, Na, K, Be, Mg, Sr, Ba, Rb and Cs; and an amount of the salt contained in the positive electrode composite layer is 0.5 mmol to 8 mmol as the number of moles of the cation B