Title:
リチウムイオン二次電池
Document Type and Number:
Japanese Patent JP7332828
Kind Code:
B2
Abstract:
Positive electrode active material particles that inhibit a decrease in capacity due to charge and discharge cycles are provided. A high-capacity secondary battery, a secondary battery with excellent charge and discharge characteristics, or a highly-safe or highly-reliable secondary battery is provided. A novel material, active material particles, and a storage device are provided. The positive electrode active material particle includes a first region and a second region in contact with the outside of the first region. The first region contains lithium, oxygen, and an element M that is one or more elements selected from cobalt, manganese, and nickel. The second region contains the element M, oxygen, magnesium, and fluorine. The atomic ratio of lithium to the element M (Li/M) measured by X-ray photoelectron spectroscopy is 0.5 or more and 0.85 or less. The atomic ratio of magnesium to the element M (Mg/M) is 0.2 or more and 0.5 or less.
Inventors:
Teruaki Ochiai
Takahiro Kawakami
Mayumi Mikami
Yohei Kadoma
Aya Tsuruta
Masahiro Takahashi
Takahiro Kawakami
Mayumi Mikami
Yohei Kadoma
Aya Tsuruta
Masahiro Takahashi
Application Number:
JP2023037617A
Publication Date:
August 23, 2023
Filing Date:
March 10, 2023
Export Citation:
Assignee:
Semiconductor Energy Laboratory Co., Ltd.
International Classes:
H01M10/0525; H01M4/36; H01M4/525; H01M4/62; H01M10/0567; H01M10/0568; H01M10/0569
Domestic Patent References:
| JP2005050712A | ||||
| JP2006012426A | ||||
| JP2009129721A |
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