Electrode for lithium ion secondary battery and lithium ion secondary battery using same
AssigneeNEC Corporation
InventorsHideaki SASAKI, Takehiro NOGUCHI
Life of this patent
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Abstract
An electrode for a lithium ion secondary battery comprising a binder comprising a vinyl chloride resin (PVC) and a polyvinylidene fluoride (PVDF), wherein the weight ratio of the PVC and the PVDF is PVC:PVDF=8:2 to 3:7, and at least one of the following (a) and (b) is satisfied: (a) the polymerization degree of the PVC is 900 or more, and (b) the polymerization degree of the PVDF is 5000 or more.
Claims7
An electrode for a lithium ion secondary battery comprising a binder comprising a vinyl chloride resin (PVC) and a polyvinylidene fluoride (PVDF), wherein
- the weight ratio of the PVC and the PVDF is PVC:PVDF=8:2 to 3:7, and
- at least one of the following (a) and (b) is satisfied:
- (a) the polymerization degree of the PVC is 900 or more, and
- (b) the polymerization degree of the PVDF is 5000 or more.
A method for preparing an electrode for a lithium ion secondary battery comprising:
- a step of preparing a binder by mixing a vinyl chloride resin (PVC) and a polyvinylidene fluoride (PVDF) in a ratio of PVC:PVDF=8:2 to 3:7 (weight ratio);
- and
- a step of applying an electrode slurry obtained by kneading the binder with a positive electrode active material or a negative electrode active material on a collector,
- wherein at least one of the following (a) and (b) is satisfied:
- (a) the polymerization degree of the PVC is 900 or more, and
- (b) the polymerization degree of the PVDF is 5000 or more.
Dependencies are inferred from the claim text.