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Preparation method and application of nickel-rich cobalt-free single crystal positive electrode material of lithium ion battery

The invention discloses a preparation method of a nickel-rich cobalt-free single crystal positive electrode material of a lithium ion battery, and belongs to the field of positive electrode materials of lithium ion batteries. The preparation method comprises the steps of preparing a nickel-rich cobalt-free hydroxide precursor through coprecipitation; uniformly mixing the precursor, molten salt and lithium salt according to a certain stoichiometric ratio, then calcining at high temperature, washing the obtained mixture with deionized water for multiple times, and drying to obtain lithium-deficient single-crystal-morphology spinel-like nickel-rich primary particles; and then supplementing a certain amount of lithium salt into the primary particles, uniformly mixing, and sintering at high temperature to obtain the single-crystal nickel-rich cobalt-free layered positive electrode material. The method is suitable for preparing the single crystal nickel-rich positive electrode material, lithium is added in the first step, the molar ratio Li/(Ni + Mg + Fe + Ti) of the lithium element to the sum of nickel, magnesium, iron and titanium is 0.8-1.0, micron-sized lithium-deficient spinel type nickel-rich single crystal particles are formed after sintering, the micron-sized large-size nickel-rich layered single crystal positive electrode material can be formed in the low-temperature range of 650-800 DEG C after water washing and lithium supplementation, the tap density is high, the lithium-nickel mixed arrangement is low, and the layered structure is good, so that the specific capacity is higher, and the cycle performance is good.
Owner:UNIV OF SCI & TECH BEIJING
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