POWDERY LITHIUM COBALT-BASED OXIDE COMPOUND FOR RECHARGEABLE LITHIUM ION BATTERY AND METHOD FOR PRODUCING THE SAME

• Main Authors: MAXIME BLANGERO, SONG KYEONGSE
• Format: Patent
• Language: English; Japanese
• Published: 15.02.2021
• 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 lithium cobalt-based oxide cathode active material powder for lithium ion secondary batteries.SOLUTION: There is provided lithium cobalt-based oxide cathode active material powder comprising particles having a median particle size D50 of 20 μm or more and 45 μm or less. The particles have an average circularity of 0.85 or more and 1.00 or less, and also have general formula Li1+aCo1-x-y-zAlxM'yMezO2 (in the formula, M' and Me comprise at least one element of the group consisting of Ni, Mn, Nb, Ti, W, Zr and Mg with -0.01≤a≤0.01, 0.002≤x≤0.050, 0≤y≤0.020 and 0≤z≤0.050). The lithium cobalt-based oxide particles have a R-3m structure and a (018) diffraction peak asymmetry factor AD(018) of 0.85 or more and 1.15 or less, the diffraction peak asymmetry factor being obtained by a synchrotron XRD spectrum analysis with an emission wavelength λ value equal to 0.825 Å.SELECTED DRAWING: Figure 2 【課題】リチウムイオン二次電池用のリチウムコバルト系酸化物カソード活物質粉末を提供する。【解決手段】メジアン粒径Ｄ５０が２０μｍ以上かつ４５μｍ以下の粒子を含むリチウムコバルト系酸化物カソード活物質粉末であって、粒子は、０．８５以上１．００以下の平均円形度を有し、一般式Ｌｉ１＋ａＣｏ１−ｘ−ｙ−ｚＡｌｘＭ'ｙＭｅｚＯ２（式中、Ｍ'及びＭｅは、Ｎｉ、Ｍｎ、Ｎｂ、Ｔｉ、Ｗ、Ｚｒ、及びＭｇからなる群の少なくとも１つの元素を含み、−０．０１≦ａ≦０．０１、０．００２≦ｘ≦０．０５０、０≦ｙ≦０．０２０、及び０≦ｚ≦０．０５０である）を有し、リチウムコバルト系酸化物の粒子は、Ｒ−３ｍ構造及び０．８５以上１．１５以下の（０１８）回折ピーク非対称因子ＡＤ（０１８）を有し、回折ピーク非対称因子は、放射波長λ値が０．８２５Åに等しいシンクロトロンＸＲＤスペクトル分析によって得られる。【選択図】図２