LITHIUM-ION SECONDARY BATTERY AND METHOD OF MANUFACTURING THE SAME

摘要

A lithium-ion secondary battery includes a positive electrode, a negative electrode and a non-aqueous electrolyte. The positive electrode includes a positive active material layer. The negative electrode includes a negative active material layer. The positive active material layer contains a positive active material and an inorganic phosphate compound. A BET specific surface area of the positive active material is 0.3 m2/g to 1.15 m2/g. The inorganic phosphate compound includes at least one of an alkali metal, an alkaline earth metal, and a hydrogen atom in a chemical formula. A content of the inorganic phosphate compound in the positive active material layer is 0.02 g/m2 to 0.225 g/m2 per unit surface area based on the BET specific surface area of the positive active material. The lithium-ion secondary battery allows an open-circuit voltage of the lithium-ion secondary battery to increase to 4.3 V or higher in terms of metal lithium.

主权项

1. A lithium-ion secondary battery comprising:
a positive electrode including a positive active material layer; a negative electrode including a negative active material layer; and a non-aqueous electrolyte, wherein the positive active material layer contains a positive active material and an inorganic phosphate compound, a BET specific surface area of the positive active material is 0.3 m2/g to 1.15 m2/g, the inorganic phosphate compound includes at least one of an alkali metal, an alkaline earth metal, and a hydrogen atom in a chemical formula, a content of the inorganic phosphate compound in the positive active material layer is 0.02 g/m2 to 0.225 g/m2 per unit surface area based on the BET specific surface area of the positive active material, and the lithium-ion secondary battery is configured to allow an open-circuit voltage of the lithium-ion secondary battery to increase to 4.3 V or higher in terms of metal lithium.