Battery and the power-consuming device containing the battery

Abstract

Battery characterized in that it comprises a positive electrode sheet, wherein the positive electrode sheet comprises a positive electrode current collector and a positive electrode material located on at least one surface of the positive electrode current collector, wherein the positive electrode material includes a positive electrode active material, wherein the positive electrode active material comprises an olivine phosphate and a lithium nickel cobalt manganese oxide, wherein the battery satisfies the following condition: 0.004 ≤ a ( c / 1.2 ) ⋅ b ≤ 0.190 , where a = a2 - a1, a1 and a2 each represent the peak positions of the (131)-crystal plane in the XRD diagram of the positive electrode sheet at a state of charge (SOC) of the battery of 20% and 80% respectively, and the unit is °; where b is the mass fraction of the lithium nickel cobalt manganese oxide in the positive electrode material and is dimensionless; where c is the ratio of the intensities of the (003) and (104) diffraction peaks in the XRD diagram of the positive electrode material and is dimensionless; where a lies in the range of 0.05° to 0.20°; where the structural formula of lithium nickel cobalt manganese oxide is: LiNi x Co y Mn z M (1-x-y-z) O2, where 0 < x < 1, 0 < y < 1, 0 < z < 1, 0 ≤ 1 - x - y - z < 1 and x / y is in the range of 4.5 to 7, while M is a doping element selected from at least one of the elements Al, W, Mg, Sr and Zr.