Patent ID: 11929492
Assignee: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A lithium-ion secondary battery, comprising a positive electrode plate, a negative electrode plate, an electrolyte and a separator, wherein the positive electrode plate comprises a positive electrode current collector and a first positive electrode active material layer and a second positive electrode active material layer sequentially disposed on at least one side of the positive electrode current collector; the lithium-ion secondary battery satisfies formula (I):

0.05≤log10(u/v)×w≤15.5  formula(I)

wherein,
u is a thickness of the first positive electrode active material layer in microns,
v is a thickness of the second positive electrode active material layer in microns,
w is a conductivity of the electrolyte at a temperature of 25° C. in mS·cm−1,
wherein the first positive electrode active material layer comprises a first positive electrode active material being the compound of formula (II),

Li1+xNiaCobM1-a-bO2-yAy  formula (II)

wherein, −0.1≤x≤0.2, 0.7≤a<1, 0 b<1, 0<a+b<1, 0≤y<0.2, M is one or more of Mn, Fe, Cr, Ti, Zn, V, Al, Zr and Ce, and A is one or more of S, F, Cl and I, and
the second positive electrode active material layer comprises a second positive electrode active material, and the second positive electrode active material is one or more of lithium manganate, lithium iron phosphate, lithium vanadate and lithium nickel manganese oxide and wherein ratio of the thickness u of the first positive electrode active material to the thickness v of the second positive electrode active material is u/v≥5.