Positive electrode active material for lithium secondary batteries, method for manufacturing the same, and lithium secondary battery

A lithium-rich high-nickel cathode active material with controlled lithium content and synthesis conditions addresses the instability of Ni(III) and cation mixing, achieving high capacity, energy density, and stability in lithium-ion batteries.

JP7841812B2Active Publication Date: 2026-04-07CLEANSOLUTION CO LTD +2
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2021-11-17
Publication Date
2026-04-07

AI Technical Summary

Technical Problem

Existing layered lithium transition metal oxides used in lithium-ion batteries face challenges in achieving high capacity, stability, and energy density due to the instability of Ni(III) and issues with cation mixing, which are exacerbated by minor changes in lithium composition during synthesis.

Method used

A lithium-rich high-nickel cathode active material with a specific lithium content range (1.01 to 1.15 mol per mole) and a controlled synthesis process involving a nickel-containing metal hydroxide precursor mixed with lithium at a specific ratio and heat-treated within a defined temperature range (680°C to 780°C) to ensure stable incorporation of excess lithium, reducing impurities and cation mixing.

Benefits of technology

The solution results in a positive electrode active material with high capacity, energy density, and improved stability, ensuring long battery life and reduced impurity content, thereby enhancing battery performance.

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Abstract

The present invention relates to a positive electrode active material for a lithium secondary battery, the positive electrode active material including a compound represented by Chemical Formula 1, the molar content of lithium present in the structure of the positive electrode active material being 1.01 to 1.15 per mole of the positive electrode active material as measured by neutron diffraction analysis; a method for producing the same; and a lithium secondary battery including the same. (chemical formula 1) Li 1+a (Ni b M 1 1-b ) 1-a O2 In Chemical Formula 1, 0 <a<0.2、0.8<b<1、M 1 is one or more elements selected from Co, Mn, Al, Mg, Ca, Ti, V, Cr, Zr, Nb, Mo, and W.
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Citation Information

Patent Citations

  • Lithium-nickel-containing composite oxide and nonaqueous electrolyte secondary battery

    JP2017226576A

  • Lithium nickel-containing composite oxide and manufacturing method thereof, lithium ion secondary battery, and evaluation method of lithium nickel-containing composite oxide

    JP2019167257A