High nickel quaternary cathode material precursor, high nickel quaternary cathode material, preparation method and application

Abstract

The invention provides a high nickel quaternary cathode material precursor, a high nickel quaternary cathode material, a preparation method and an application. The chemical formula of the high nickelquaternary cathode material is shown as a formula Lia(Ni1-x-y-zCoxAlyMnz)O2, x, y, z and a are mole fractions, x is larger than 0.03 and smaller than or equal to 0.15, y is larger than 0.01 and smaller than 0.05, z is larger than 0.01 and smaller than 0.05, 1-x-y is larger than 0.6 and smaller than 0.9, and a is larger than or equal to 1 and smaller than or equal to 1.1. Soluble nickel salt, soluble cobalt salt, soluble aluminum salt and soluble manganese salt are prepared in a form of a solution and can be uniformly distributed in the solution, and the high-nickel quaternary cathode materialprecursor is prepared from the solution with the uniformly distributed nickel salt, cobalt salt, aluminum salt and manganese salt; then, the high nickel quaternary cathode material precursor and lithium salt are mixed and sintered four times, and the high nickel quaternary cathode material is obtained. The high nickel quaternary cathode material has stable structure, high safety performance, longcycle life and good thermal stability.

Description

technical field [0001] The invention relates to the field of electrode materials, in particular to a precursor of a high-nickel quaternary positive electrode material, a high-nickel quaternary positive electrode material, a preparation method and an application. Background technique [0002] As a new type of green energy, lithium-ion batteries have the advantages of high specific energy, small self-discharge, high open circuit voltage, no memory effect, long cycle life, and no environmental pollution, so they are widely used in mobile phones, notebook computers, digital cameras, etc. At the same time, lithium-ion batteries are also power sources for electric vehicles and energy storage power sources for solar renewable energy. The positive electrode materials of ion batteries that we are familiar with mainly include lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, ternary materials, and lithium iron phosphate, etc. However, due to the lack of cobalt resou...

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Problems solved by technology

The positive electrode materials of ion batteries that we are familiar with mainly include lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, ternary materials, and lithium iron phosphate, etc. However, due to the lack of cobalt resources and high toxicity, the production cost of lithium cobalt oxide is high. However, its cycle performance is poor, which limits its industrial application; lithium manganese oxide has It has the advantages of rich resources, low cost, no pollution, good safety, and good rate performance, but its cycle performance and electrochemical stability are poor, which greatly limits its industrialization; the safety and cycle life of lithium iron phosphate materials are both It has obvious advantages, but the compaction density of the material itself is too low, resulting in low specific energy of the battery, which limits the room for improvement in the cruising range of the vehicle; the cost of ternary materials is low, equivalent to 1 / 4 of lithium cobalt oxide And it is more green and environmentally friendly. Compared with several other materials, the energy density of the battery has been improved, but its safety is not high enough at present.

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