Lithium ion secondary battery and method of manufacturing same
AssigneeToyota Jidosha Kabushiki Kaisha
InventorKoji Okuda
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Abstract
A lithium ion secondary battery at least includes a positive electrode, a negative electrode, and an electrolyte solution. The positive electrode at least includes a positive electrode active material and a binder. The positive electrode active material includes more than or equal to 0.08 mass % of a lithium carbonate and a remainder of a lithium complex oxide. The binder is at least one selected from a group consisting of polytetrafluoroethylene, polyethylene oxide, and carboxymethylcellulose. The electrolyte solution at least includes a solvent and a lithium salt. The solvent is at least one of N,N-dimethylformamide and dimethylacetamide. A concentration of the lithium salt in the electrolyte solution is more than or equal to 1.9 mol/l and less than or equal to 2.3 mol/l.
Claims16
A lithium ion secondary battery at least comprising a positive electrode, a negative electrode, and an electrolyte solution,
- the positive electrode at least including a positive electrode active material and a binder,
- the positive electrode active material including from 0.10 mass % to 0.2 mass % of a lithium carbonate and a remainder of a lithium complex oxide,
- the binder being at least one selected from a group consisting of polytetrafluoroethylene, polyethylene oxide, and carboxymethylcellulose,
- the electrolyte solution at least including a solvent and a lithium salt,
- the solvent being at least one of N,N-dimethylformamide and dimethylacetamide,
- a concentration of the lithium salt in the electrolyte solution being more than or equal to 1.9 mol/l and less than or equal to 2.3 mol/l.
A method of manufacturing a lithium ion secondary battery, the method comprising:
- preparing a positive electrode active material by exposing a lithium complex oxide to carbon dioxide;
- preparing a positive electrode paste by at least mixing the positive electrode active material, a binder, and water;
- manufacturing a positive electrode by drying the positive electrode paste;
- manufacturing a negative electrode;
- preparing an electrolyte solution at least including a solvent and a lithium salt;
- and
- manufacturing a lithium ion secondary battery at least including the positive electrode, the negative electrode, and the electrolyte solution,
- the positive electrode active material being prepared to include from 0.10 mass % to 0.2 mass % of a lithium carbonate and a remainder of the lithium complex oxide,
- the binder being at least one selected from a group consisting of polytetrafluoroethylene, polyethylene oxide, and carboxymethylcellulose,
- the electrolyte solution being prepared such that the solvent is at least one of N,N-dimethylformamide and dimethylacetamide and a concentration of the lithium salt is more than or equal to 1.9 mol/l and less than or equal to 2.3 mol/l.
Dependencies are inferred from the claim text.