POSITIVE ELECTRODE ACTIVE MATERIAL FOR SECONDARY BATTERY AND MANUFACTURING METHOD THEREOF

• Main Authors: TAKAKURA TERU, MATSUBARA KEIKO
• Format: Patent
• Language: English; Japanese
• Published: 09.07.2020
• 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 positive electrode active material capable of achieving high energy density as a secondary battery by increasing the density of the positive electrode active material powder and the positive electrode density.SOLUTION: A positive electrode active material for a secondary battery includes one or more compounds represented by the following chemical formula (I). Li[LixMnyM(1-x-y)]O2 (I). The positive electrode active material is in the form of secondary particles in which primary particles are aggregated, and the powder pressure density when the positive electrode active material powder is pressed at a pressure of 62 MPa is 2.7 g/cm3 or more, and the crystallite size obtained from a diffraction line (104) by X-ray diffraction of the positive electrode active material is 20 nm or more and 30 nm or less.SELECTED DRAWING: Figure 1 【課題】 正極活物質粉体自体の密度及び正極密度を高めて二次電池として高いエネルギー密度を達成しうる正極活物質を提供する。【解決手段】 二次電池用正極活物質であって、下記化学式（Ｉ）で表される一種又は二種以上の化合物を含んでなり、Ｌｉ［ＬｉxＭｎyＭ(1-x-y)］Ｏ2（Ｉ）前記正極活物質は、一次粒子が凝集した二次粒子の形態をなし、６２ＭＰａの圧力で前記正極活物質粉体を加圧した際の粉体加圧密度が２．７ｇ／ｃｍ3以上であり、前記正極活物質のＸ線回折による回折線（１０４）から求めた結晶子サイズが２０ｎｍ以上３０ｎｍ以下である、二次電池用正極活物質により達成される。【選択図】 図１