Core-double shell structure composite nickel-cobalt-manganese ternary cathode material and lithium battery and vehicle

Abstract

The invention discloses a core-double-shell structure composite nickel-cobalt-manganese ternary positive electrode material, a lithium battery and a vehicle, wherein the core-double-shell structure composite nickel-cobalt-manganese ternary positive electrode material includes: an inner core, and the chemical formula of the inner core material is Li (1+a) (Li z1 Ni x1 co y1 mn 1‑x1‑y1‑z1 )O 2 , 0≤a≤0.5, 0<x 1 <1, 0<y 1 <1, 0<z 1 <1, 0<1‑x 1 -y 1 -z 1 <1; sub-shell layer, the sub-shell layer is coated on at least a part of the outer surface of the inner core, and the chemical formula of the material of the sub-shell layer is Li (1+a) Ni x2 co y2 m (1‑x2‑y2) o 2 , M is Mn and / or Al, 0≤a≤0.5, 0<x 2 <1, 0<y 2 <1, 0<1‑x 2 -y 2 <1; the outermost layer, the outermost layer is coated on at least a part of the outer surface of the subshell layer, and the material of the outermost layer is a metal oxide. Therefore, the single battery made of the positive electrode material can achieve long cycle life on the basis of high specific energy, so that the vehicle loaded with the battery has excellent endurance and meets the needs of consumers.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a core-double shell structure composite nickel-cobalt-manganese ternary positive electrode material, a lithium battery and a vehicle. Background technique [0002] As far as new energy vehicles are concerned, regardless of the state's support policies, the key factor determining their development is still whether they can meet the needs of consumers. At present, limited by the technical level of power batteries, the cruising range of most commercial pure electric vehicles is still low, and consumers have serious "mileage anxiety" about them, and their desire to buy is not strong. The battery life of pure electric vehicles can reach 320 kilometers, which can meet the needs of most consumers; the battery life can reach 600 kilometers, which is close to the mileage of fuel vehicles with full fuel, so that consumers' "range anxiety" can be eliminated. Therefore, develo...

AI Technical Summary

Problems solved by technology

Although lithium-rich manganese-based nickel-cobalt-manganese ternary cathode materials have the absolute advantage of high battery specific energy, lithium-rich manganese-based nickel-cobalt-manganese ternary cathode materials have a transition from layered structure to spinel structure during long-term cycling. The irreversible phase transition process and the dissolution of Mn elements into the electrolyte during the cycle lead to deviations in cycle life, especially in high-temperature cycle performance, which in turn affects the service life of power batteries for new energy vehicles

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