City University of Hong Kong

Qi Liu

Ho Man Chan

Jeremiah B Palmerston

He Zhu

Qi She

A method for preparing a high-performance single-crystal layered cathode material of formula LiNiTMO(0.6<x<0.9, TM=one or more of Mn, Co, Fe, Zr, V, Ti) or formula NaTMO(TM=one or more of Ni, Mn, Fe, Cr, and Co). Stoichiometric amounts of transition-metal salts are mixed to form a transition metal salt solution. A precipitating agent is added to the transition metal salt solution followed by co-precipitating a mixed transition metal precipitant. The mixed transition metal precipitant is mixed with a lithium precursor or a sodium precursor to form a cathode material precursor mixture. The cathode material precursor mixture is subjected to various calcining and grinding processes followed by annealing to create single crystal layered cathode material particles.

Preparation of single-crystal layered cathode materials for lithium- and sodium-ion batteries

A controlled oxidizing method is provided for preparing a high-performance nickel-rich lithium ion battery cathode material having a composition of LiNiMO, where 0.6<x<0.9, and M is one or more metals selected from the group consisting of Co, Mn, Fe, Ti, Zr, V, and Cr. The method comprises combining a water-soluble salt precursor of nickel and a water-soluble salt precursor of the one or more M metals with one or more oxidizing agents to form an aqueous solution. The aqueous solution is alkalized to a selected pH value to produce precipitated precursors. The precipitated precursors are mixed with a lithium precursor to form a lithiated precursor. The lithiated precursor is calcined to form the nickel-rich lithium ion battery cathode material.

Nickel-rich layered oxide cathode materials for Li ion batteries

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Hong Kong, China

Qi Liu