Patent 8178237 was granted and assigned to Sony on May, 2012 by the United States Patent and Trademark Office.
A non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode and a non-aqueous electrolyte, wherein the negative electrode contains a negative electrode mixture containing a binder; and the binder contains polyvinylidene fluoride and polyacrylonitrile, with a mass ratio of polyvinylidene fluoride to polyacrylonitrile ranging from 99.9/0.1 to 95.1/4.9.