2 2 ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY PROVIDED WITH SAME

• Main Authors: KOBAYASHI KENICHI, MAEYAMA HIROTO, SUKIGARA TORU, OGAWA ATSUSHI, KAWAMURA SOSHI
• Format: Patent
• Language: English; Korean
• Published: 25.01.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

높은 출력 특성을 얻을 수 있는 비수계 전해질 2차 전지용 전극을 제공하는 것. 집전체와, 집전체 상에 배치되어 정극 활물질을 포함하는 정극 활물질층을 구비하는 비수계 전해질 2차 전지용 전극으로서, 정극 활물질은 전자 현미경 관찰에 기초한 평균 입경(DSEM)이 1 ㎛ 이상 7 ㎛ 이하이고, 평균 입경(DSEM)에 대한, 체적 기준에 따른 누적 입도 분포에 있어서의 50% 입경(D50)의 비(D50/DSEM)가 1 이상 4 이하이고, 또한, 체적 기준에 따른 누적 입도 분포에 있어서의 10% 입경(D10)에 대한, 체적 기준에 따른 누적 입도 분포에 있어서의 90% 입경(D90)의 비(D90/D10)가 4 이하인 2 종류 이상의 전이 금속에 의한 층상 구조를 갖는 화합물 입자를 포함하여 구성되고, 정극 활물질층은 공공률이 10∼45%이다. The present invention provides an electrode for nonaqueous electrolyte secondary batteries, which enables the achievement of high output characteristics. An electrode for nonaqueous electrolyte secondary batteries, which is provided with a collector and a positive electrode active material layer that is arranged on the collector and contains a positive electrode active material. The positive electrode active material is configured to contain compound particles which have a layered structure composed of two or more transition metals, and which have an average particle diameter DSEM of from 1 µm to 7 µm (inclusive) based on the observation with an electron microscope, a ratio of the 50% particle diameter D50 in a volume-based cumulative particle size distribution to the average particle diameter DSEM, namely D50/DSEM of from 1 to 4 (inclusive), and a ratio of the 90% particle diameter D90 in the volume-based cumulative particle size distribution to the 10% particle diameter D10 in the volume-based cumulative particle size distribution, namely D90/D10 of 4 or less. The positive electrode active material layer has a void fraction of 10-45%.