Method for preparing cathode active material precursor for secondary battery, and preparation apparatus using same

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United States of America Patent

PATENT NO 11827524
APP PUB NO 20210163306A1
SERIAL NO

16772913

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Abstract

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A method for preparing a cathode active material precursor for a secondary battery, including: moving a co-precipitation filtrate generated after a co-precipitation reaction to a co-precipitation filtrate storage tank; removing a metal hydroxide by passing the co-precipitation filtrate through a filter; reacting the co-precipitation filtrate from which the metal hydroxide is removed with sulfuric acid or nitric acid to produce an ammonium sulfate or an ammonium nitrate while removing ammonia from the co-precipitation filtrate from which the metal hydroxide is removed; cooling and crystallizing the co-precipitation filtrate from which the metal hydroxide and ammonia are removed to precipitate a sodium sulfate; filtering the precipitated sodium sulfate to separate the precipitated sodium sulfate from the co-precipitation filtrate from which the metal hydroxide and ammonia are removed; drying the sodium sulfate separated from the co-precipitation filtrate and moving the co-precipitation filtrate separated from the sodium sulfate to a circulation concentration tank; and heating the co-precipitation filtrate stored in the circulation concentration tank to a predetermined temperature for recycling and performing N2 purging or bubbling, is provided.

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Patent Owner(s)

Patent OwnerAddress
RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY67 CHEONGAM-RO NAM-GU POHANG-SI GYEONGSANGBUK-DO 37673 37673
POSCO HOLDINGS INC440 TEHERAN-RO GANGNAM-GU SEOUL 06194 06194
POSCO FUTURE M CO LTD110 SINHANG-RO NAM-GU POHANG-SI GYEONGSANGBUK-DO 37918 37918

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ryu, Hwang Yol Pohang-si, KR 2 0
You, Ki Sung Pohang-si, KR 3 0

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