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

Abstract

Provided is a method for preparing a cathode active material precursor for a secondary battery, comprising the steps of: moving, to a coprecipitation filtrate storage tank, a coprecipitation filtrategenerated after a coprecipitation reaction; removing a metal hydroxide by passing the coprecipitation filtrate through a filter; reacting the metal hydroxide-removed coprecipitation filtrate with sulfuric acid or nitric acid, thereby generating ammonium sulfate or ammonium nitrate while removing ammonia from the metal hydroxide-removed coprecipitation filtrate; precipitating sodium sulfate by cooling and crystallizing the coprecipitation filtrate from which the metal hydroxide and ammonia are removed; filtering the precipitated sodium sulfate, thereby separating the precipitated sodium sulfatefrom the coprecipitation filtrate from which the metal hydroxide and ammonia are removed; drying the sodium sulfate separated from the coprecipitation filtrate, and moving, to a circulation concentration tank, the coprecipitation filtrate separated from the sodium sulfate; and heating, to a predetermined temperature, the coprecipitation filtrate stored, in order to be recycled, in the circulationconcentration tank, and carrying out N2 purging or bubbling.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode active material precursor of a secondary battery and a preparation device using the method. More specifically, the present invention relates to a preparation method of a precursor of a positive electrode active material of a secondary battery and a preparation device for realizing the preparation method. The preparation method includes a co-precipitation filtrate reuse process. Background technique [0002] With the rapid development of science and technology, not only various electronic products and communication equipment have appeared on the market in recent years, but also electric vehicles that require large-capacity storage devices have appeared on the market, and the demand for secondary batteries as their power sources is growing rapidly. [0003] Generally, the state-of-the-art technology for preparing precursors of cathode active materials for secondary batteries is a techn...

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Problems solved by technology

[0007] In the prior art or in the literature, continuous stirred tank reactors, Couette-Taylor continuous reactors, batch reactors, etc. are known, but a co-precipitation process is not proposed, which can improve the dissolution rate in the co-precipitation process. The yield of metal ions, and reduce the amount of waste water or reuse co-precipitation filtrate

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