POSITIVE ELECTRODE ACTIVE MATERIAL, POSITIVE ELECTRODE, BATTERY, BATTERY PACK, ELECTRONIC EQUIPMENT, ELECTRIC MOTOR VEHICLE, POWER STORAGE DEVICE AND ELECTRIC POWER SYSTEM

• Main Authors: KUNIKIYO TOSHIYUKI, MIYAZAKI TAKESHI, INABA YUTA, HATTORI SHINNOSUKE
• Format: Patent
• Language: English; Japanese
• Published: 02.08.2018
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide a positive electrode active material which can suppress the decrease in initial charge and discharge efficiency.SOLUTION: A positive electrode active material comprises: a lithium transition metal composite oxide having a lamellar rock salt type structure. According to X-ray absorption fine structure spectra measured in the state of being uncharged, there is an X-ray absorption end providing an intensity of 0.5 within an X-ray energy range of 1302 eV or more and 1312 eV or less; in a group of peaks having the absorption end, a high energy-side spectral intensity minimum in the lowest energy-side peaks excluding a pre-edge peak is 1312.5 eV or higher.SELECTED DRAWING: None 【課題】初回充放電効率の低下を抑制できる正極活物質を提供する。【解決手段】正極活物質は、層状岩塩型の構造を有するリチウム遷移金属複合酸化物を含み、未充電状態で測定されたＸ線吸収微細構造スペクトルにおいて、Ｘ線エネルギーが１３０２ｅＶ以上１３１２ｅＶ以下である範囲内に、強度０．５を与えるＸ線の吸収端が存在し、該吸収端を持つピーク群のうち、プリエッジピークを除いて最も低エネルギー側のピークにおける高エネルギー側スペクトル強度極小点が１３１２．５ｅＶ以上である。【選択図】なし