Manufacturing method of positive electrode active material, and lithium secondary battery

Method for manufacturing high-quality quaternary cathode active material

This technology is about the manufacturing method of a quaternary cathode active material.

When synthesizing a quaternary precursor with additional aluminum introduced in an existing ternary system, it is difficult to synthesize the material when using the coprecipitation method, and in particular, an additional aluminum doping process must be added after synthesizing the ternary NCM precursor, which has the disadvantage of making the process complicated. To solve this problem, this technology proposes the use of solvothermal synthesis.  

The method for producing a positive electrode active material according to this technology has fewer control variables compared to the coprecipitation method, does not require the introduction of an additional aluminum doping process, and uses a simple solvothermal synthesis method without changing the existing process. Therefore, it is possible to synthesize a quaternary cathode active material precursor (NCMA precursor) containing aluminum in the precursor synthesis step, and it is expected to increase the commercial applicability of quaternary positive active materials by enabling the synthesis of high-quality spherical positive electrode active materials with uniform sizes.

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Key Features:

• Manufacture a positive electrode active material precursor by heat treating a mixture of a compound precursor and a solvent
• Add lithium raw material to the positive active material precursor and heat treat it to manufacture a compound represented by the chemical formula Li[NiaCobMncAld]O
• The compound precursors are nickel nitrate (Ni(NO3)2), cobalt nitrate (Co(NO3)2), and manganese nitrate (Mn(NO3)2). and utilizing aluminum nitrate (Al(NO3)3)
• By using a nitrate-type precursor, a spherical positive electrode active material can be formed, and stability is improved compared to using acetate as a precursor

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This technology was developed through support from the National Research Foundation of Korea's functional interface structure research project for lithium cathode-based high-capacity energy storage.

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