Nonaqueous electrolyte secondary cell

• Main Author: YAMATE SHIGEKI
• Format: Patent
• Language: English
• Published: 15.06.2006
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

It is an object of the present invention to provide a non-aqueous electrolyte secondary battery having high energy density and satisfactory cycle performance by using an alloy comprising Ni and Sn as a negative active material; and the non-aqueous electrolyte secondary battery comprising a negative electrode with a composite layer containing a negative active material, a positive electrode and a non-aqueous electrolyte is characterized in that said negative active material consists of an alloy containing 5 to 25 mass % of nickel and 75 to 95 mass % of tin, and that such alloy contains Sn4Ni3 phase and Sn phase. It is preferable that the content ratio of Sn4Ni3 phase and Sn phase in the above described alloy be 0.2<=Z<=3, supposing that ml is the mass of Sn4Ni3 phase, m2 is the mass of said Sn phase, and Z=m1/m2; and that the above described composite layer contain carbon material.