Method For Preparing Nickel-Rich Hydroxide Precursor Material And Method For Preparing Nickel-Rich Oxide Cathode Material

Abstract: the present disclosure provides the methods for preparing nickel-rich hydroxide precursor material and nickel-rich oxide cathode material having a homogeneous structure with an element concentration-gradient distribution by utilizing a continuous taylor-flow reactor, comprising: (1) preparing an aqueous solution a with metal ion raw materials dissolved therein, an aqueous solution b with a manganese source dissolved therein, an aqueous solution c with a precipitant dissolved therein, and an aqueous solution d with a chelating agent dissolved therein; feeding the aqueous solution a, the aqueous solution c and the aqueous solution d into the continuous taylor-flow reactor to perform a first co-precipitation reaction; (2) feeding the aqueous solution b into the continuous taylor-flow reactor to perform a second co-precipitation reaction; (3) washing the precipitate obtained from the second co-precipitation reaction and putting the precipitate into an oven to dry the precipitate to fabricate the nickel-rich hydroxide precursor material. the nickel-rich hydroxide precursor material prepared with the method of the present disclosure exhibiting an element gradient distribution with the nickel-rich inner layer and the manganese-rich outer layer may reduce the diffusion impedance of the lithium ions and increase their migration paths, and the nickel-rich oxide cathode material prepared from the nickel-rich hydroxide precursor material may increase the electrochemical performances and mechanical stability of the lithium-ion cells, such as charging and discharging rate, long-term cycle life, etc.

Inventor(s): Chun-Chen YANG, Yi-Shiuan WU, Juliya JEYAKUMAR, Manojkumar SEENIVASAN, Hui-Chi LIU, Ruey-Yu WANG

CPC Classification: C01G53/42 ({containing alkali metals, e.g. LiNiO})

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