Patent ID: 9112222
Filing Date: 2015-08-18
Classification: C01B,C01G,C01P,H01M,Y02E,Y02T

Abstract:
1. A lithium ion secondary battery comprising: a positive electrode; a negative electrode that includes a negative electrode active material; and an electrolytic solution, at least one of the positive electrode and the negative electrode being capable of storing and releasing lithium ions, and containing an active material that is at least one of a positive electrode active material and the negative electrode active material, the active material satisfying the following conditions (A) to (D): (A) the active material being a Li complex oxide or a Li complex oxoacid salt that contains lithium, oxygen, and at least one of the elements of Groups 2 to 15 of the long-form periodic table; (B) the active material containing a plurality of primary particles having a particle size distribution (median diameter: nm) with 1 nm <D10<65 nm, 5 nm <D50<75 nm, and 50 nm <D90<100 nm; (C) the active material having a plurality of pores between the plurality of primary particles, wherein the maximum peak pore size A (nm) in a pore size distribution as measured by a mercury intrusion technique is 10 nm≦A≦75 nm; and (D) the ratio B/A of the maximum peak pore size A (nm) and the crystallite size B (nm) determined from the half width of the X-ray diffraction pattern of the active material as measured by X-ray diffractometry is 0.5<B/A≦1; wherein the negative electrode active material comprises, or further comprises, carbon.