Title:
NONAQUEOUS ALKALI METAL POWER STORAGE ELEMENT
Document Type and Number:
Japanese Patent JP2023049808
Kind Code:
A
Abstract:
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 a positive electrode, a negative electrode, a separator and a nonaqueous electrolytic solution. 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. When C (mAh/cm2) represents single-pole capacity of the positive electrode, and D (mAh/cm2) represents single-pole capacity of the negative electrode, 0.08≤C/D≤0.15 is satisfied. 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 an 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
Inventors:
UMEZU KAZUTERU
TAKADA KAZUAKI
TAKADA KAZUAKI
Application Number:
JP2021159783A
Publication Date:
April 10, 2023
Filing Date:
September 29, 2021
Export Citation:
Assignee:
ASAHI KASEI CORP
International Classes:
H01G11/50; H01G11/14; H01G11/36; H01G11/62; H01M4/13; H01M4/587; H01M4/62; H01M10/0568; H01M10/058; H01M16/00
Attorney, Agent or Firm:
Aoki Atsushi
Shinji Mihashi
Kazuhiro Nakamura
Saito Tsuko
Shunsuke Sanma
Shinji Mihashi
Kazuhiro Nakamura
Saito Tsuko
Shunsuke Sanma
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