非水系電解質二次電池用正極材料の抵抗評価方法

Japanese Patent JP7064821

B2

PROBLEM TO BE SOLVED: To evaluate the resistance of a positive electrode material of a nonaqueous electrolyte secondary battery readily in a faster, accurate and low-cost manner.SOLUTION: A method for resistance evaluation of a positive electrode material for a nonaqueous electrolyte secondary battery is arranged to evaluate the resistance of a positive electrode material for a nonaqueous electrolyte secondary battery. The method comprises: a step S12 for stationarily leaving a battery for evaluation which is a nonaqueous electrolyte secondary battery for a given time after production thereof; a step S13 for charging the battery for evaluation which has been stationarily left for the given time with a constant current; a step S15 for discharging the battery for evaluation with a constant current after the constant current charging the battery and a pausing step subsequent thereto; a step S17 for charging the battery for evaluation with a constant current and a constant voltage after the constant current discharging the battery and a pausing step subsequent thereto; and a step S18 for measuring the resistance of the positive electrode material by an AC impedance method after the charging with the constant current and constant voltage.SELECTED DRAWING: Figure 2

Koji Koji
Kondo Mitsukuni

JP2016106490A

May 11, 2022

May 27, 2016

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Sumitomo Metal Mining Co., Ltd.

H01M4/485; H01M4/139; H01M10/052; H01M50/409

JP2007103065A
JP201134861A
JP201478360A
JP2012221756A
JP20032660A

Akira Koike
Takaaki Kono
Akihiko Kitahara
Hiroyuki Murakami

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