Non-aqueous electrolyte secondary battery
View Patent ↗A non-aqueous electrolyte secondary battery having a high negative electrode energy density, good safety and high discharge characteristics is provided without damaging manufacturing facilities. The non-aqueous electrolyte secondary battery includes a positive electrode, a negative electrode, a porous heat-resistant layer interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte. The negative electrode comprises a negative electrode current collector and a negative electrode mixture layer on a surface of the negative electrode current collector, and the negative electrode mixture layer has an active material density of 1.5 g/ml to 1.8 g/ml. The porous heat-resistant layer is carried on the negative electrode, and the porous heat-resistant layer comprises magnesium oxide particles having a mean particle size of 0.5 μm to 2 μm.
1. A non-aqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, a separator interposed between said positive electrode and said negative electrode, a porous heat-resistant layer interposed between said positive electrode and said negative electrode, and a non-aqueous electrolyte, said positive and negative electrodes being wound with said separator and said porous heat-resistant layer,
said negative electrode comprising a negative electrode current collector and a negative electrode mixture layer on a surface of said negative electrode current collector,
said negative electrode mixture layer having an active material density of 1.5 g/ml to 1.8 g/ml,
said porous heat-resistant layer being carried on said negative electrode, and said porous heat-resistant layer comprising magnesium oxide particles having a mean particle size of 0.5 μm to 2 μm,
wherein said porous heat-resistant layer contains 1 to 5 parts by weight of a binder per 100 parts by weight of said magnesium oxide particles, and said porous heat-resistant layer has a thickness of 1 μm to 5 μm.
2. A non-aqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, a porous heat-resistant layer interposed between said positive electrode and said negative electrode, and a non-aqueous electrolyte, said positive and negative electrodes being wound with said porous heat-resistant layer,
said negative electrode comprising a negative electrode current collector and a negative electrode mixture layer on a surface of said negative electrode current collector,
said negative electrode mixture layer having an active material density of 1.5 g/ml to 1.8 g/ml,
said porous heat-resistant layer being carried on said negative electrode, and said porous heat-resistant layer comprising magnesium oxide particles having a mean particle size of 0.5 μm to 2 μm,
wherein a separator is not provided between said positive electrode and said negative electrode, said porous heat-resistant layer contains 1 to 5 parts by weight of a binder per 100 parts by weight of said magnesium oxide particles, and said porous heat-resistant layer has a thickness of 2 μm to 15 μm.
3. The non-aqueous electrolyte secondary battery in accordance with claim 1 , wherein said magnesium oxide particles have a BET specific surface area of 3 m 2 /g to 15 m 2 /g.
4. The non-aqueous electrolyte secondary battery in accordance with claim 1 , wherein said porous heat-resistant layer has a porosity of 30% to 70%.
5. The non-aqueous electrolyte secondary battery in accordance with claim 2 , wherein said magnesium oxide particles have a BET specific surface area of 3 m 2 /g to 15 m 2 /g.
6. The non-aqueous electrolyte secondary battery in accordance with claim 2 , wherein said porous heat-resistant layer has a porosity of 30% to 70%.