NONAQUEOUS ALKALI METAL POWER STORAGE ELEMENT

Japanese Patent JP2023049744

A

To provide a nonaqueous alkali metal power storage element, suppressing increase in resistance in high-temperature high-voltage cycles and having a high capacity retention rate.SOLUTION: There is provided, a nonaqueous alkali metal power storage element including an electrode body comprising a positive electrode, a negative electrode and a separator, and a nonaqueous electrolytic solution containing alkali metal ions. A positive electrode active material layer contains: a positive electrode active material containing a carbon material; and an alkali metal carbonate. Concentration of hexafluorophosphate ions contained in the nonaqueous electrolytic solution is 0.00 mol/L or more and 0.05 mol/L or less. The positive electrode has a protective layer and a non-protective layer, on a positive electrode current collector. On a projection plane, in a lamination direction, of the electrode body, the protective layer overlaps a negative electrode end. When A(mAh/g) represents alkali metal ion concentration per unit area at an outer periphery of the negative electrode, and B (mAh/g) represents alkali metal ion concentration per unit area at a central part of the negative electrode, 1.02≤B/A≤1.45 is satisfied.SELECTED DRAWING: Figure 1

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UMEZU KAZUTERU
TAKADA KAZUAKI
KIMURA YUIMA

JP2021159676A

April 10, 2023

September 29, 2021

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ASAHI KASEI CORP

H01G11/26; H01G11/10; H01G11/36; H01G11/50; H01G11/62; H01M4/13; H01M4/587; H01M4/62; H01M10/0568; H01M10/058; H01M16/00

Aoki Atsushi
Shinji Mihashi
Kazuhiro Nakamura
Saito Tsuko
Shunsuke Sanma

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