Nonaqueous electrolyte secondary battery
OwnerHidekazu Yamamoto, Keiji Saisho +2inventors
InventorsHidekazu Yamamoto, Keiji Saisho, Yoshio Kato, Shigeki Matsuta
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Abstract
Disclosed is a nonaqueous electrolyte secondary battery which has a negative electrode containing silicon as a negative active material, a positive electrode containing a positive active material, a nonaqueous electrolyte and a separator. Characteristically, an additive which retards oxidation of silicon during operation of the battery is contained either in an interior or surface portion of the positive electrode, or in an interior or surface portion of the negative electrode, or in an interior or surface portion of the separator.
Claims12
A nonaqueous electrolyte secondary battery which includes a negative electrode containing silicon as a negative active material, a positive electrode containing a positive active material, a nonaqueous electrolyte and a separator;
- said battery being characterized in that an additive which retards oxidation of said silicon during battery operation is contained either in an interior or surface portion of said positive electrode, or in an interior or surface portion of said negative electrode, or in an interior or surface portion of said separator;
- wherein said additive is selected from the group consisting of acetic anhydride;
- oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, phthalic acid and fumaric acid, and their salts and esters;
- hydroxy acids;
- lithium carbonate;
- lithium nitrate;
- lithium sulfonate;
- acrylic acid and its derivatives;
- and methacrylic acid and its derivatives;
- and said nonaqueous electrolyte contains a film former which forms a film on a surface of said negative electrode, said film former comprising vinylene carbonate.
Dependencies are inferred from the claim text.