Patent ID: 6235427
Filing Date: 2001-05-22
Classification: H01M,Y02E,Y10T

Abstract:
A nonaqueous secondary battery comprising a positive electrode having a positive electrode active material, a negative electrode having a negative electrode material, and a nonaqueous electrolyte, wherein said positive electrode active material is a transition metal oxide capable of intercalating and deintercalating lithium, and said negative electrode material comprises at least one silicic material capable of intercalating and deintercalating lithium selected from the group consisting of silicon, a silicon alloy and a silicide,wherein said silicic material has an average particle size of 0.001 to 10 .mu.m,wherein said silicic material is coated with a plurality of materials, and a coating rate of said silicic material is 10% or more, andwherein the negative electrode has a rate of expansion of 1.05 to 3.0 on lithium intercalation.