POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, MANUFACTURING METHOD FOR THE SAME, AND LITHIUM SECONDARY BATTERY

• Main Authors: KIM YOUNGJIN, ARUMUGAM MANTHIRAM, KIM HANSEUL, KONG YOUNGSUN, SEONG WONMO
• Format: Patent
• Language: English; Japanese
• Published: 11.04.2024
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a high-nickel positive electrode active material whose initial charging-discharging efficiency and battery safety at a voltage as high as 4.35 V or more are improved, a manufacturing method for the same, and a lithium secondary battery including the same.SOLUTION: A positive electrode active material for a lithium secondary battery according to an embodiment includes a lithium-nickel composite oxide particle containing a molar content of nickel of 80 mol% or more relative to the entire elements excluding lithium and oxygen, and containing one or more elements selected from the group consisting of B, Sb, and Nb, a first coating layer existing on a surface of the particle and containing one or more elements selected from the group consisting of B, Sb, and Nb, and a second coating layer existing on the first coating layer and containing metal phosphate.SELECTED DRAWING: Figure 4 【課題】４．３５Ｖ以上の高電圧で初期充放電効率と電池安全性が両方とも向上した高ニッケル系正極活物質とその製造方法およびこれを含むリチウム二次電池を提供する。【解決手段】一実施形態によるリチウム二次電池用正極活物質は、ニッケルのモル含量がリチウムと酸素を除いた元素全体に対して８０モル％以上であり、Ｂ、Ｓｂ、およびＮｂからなる群より選択される一つ以上の元素を含有するリチウムニッケル系複合酸化物粒子、前記粒子の表面に位置しＢ、Ｓｂ、およびＮｂからなる群より選択される一つ以上の元素を含有する第１コーティング層、および第１コーティング層上に位置し金属ホスフェートを含有する第２コーティング層を含む。【選択図】図４