リチウムイオン二次電池

Japanese Patent JP7460310

B2

A positive electrode active material particle with little deterioration is provided. A power storage device with little deterioration is provided. A highly safe power storage device is provided. The positive electrode active material particle includes a first crystal grain, a second crystal grain, and a crystal grain boundary positioned between the crystal grain and the second crystal grain; the first crystal grain and the second crystal grain include lithium, a transition metal, and oxygen; the crystal grain boundary includes magnesium and oxygen; and the positive electrode active material particle includes a region where the ratio of the atomic concentration of magnesium in the crystal grain boundary to the atomic concentration of the transition metal in first crystal grain and the second crystal grain is greater than or equal to 0.010 and less than or equal to 0.50.

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Masahiro Takahashi
Teruaki Ochiai
Yohei Kadoma
Aya Tsuruta

JP2022117242A

April 02, 2024

July 22, 2022

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Semiconductor Energy Laboratory Co., Ltd.

H01M4/525; H01M4/131; H01M4/62

JP2003068306A
JP2016054151A

WO2003069702A1
CN1715193A

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