Nonaqueous electrolyte secondary battery and method for producing same

A method for manufacturing a nonaqueous electrolyte secondary battery comprising a positive electrode and a negative electrode that are capable of reversibly absorbing and desorbing Li ions;

• and a nonaqueous electrolyte having lithium ion conductivity, the method comprising the steps of:
• (i) forming a first sheet by applying a slurry to a surface of a collector comprising Cu in the amount of 95 mass % or more, followed by drying, the slurry comprising active material particles comprising Si and at least one element R selected from the group consisting of Sn, In, Ga, Pb and Bi;
• and
• (ii) forming the negative electrode so that a metallic bond including the element R is formed between a part of the active material particles and the collector and 80 atomic % or more of the element R exists in a range from a surface of the active material particle to a depth of 0.1D where D denotes a particle diameter of the active material particle by heat-treating the first sheet at a temperature ranging from 80° C. to 350° C. in a non-oxidizing atmosphere.

A method for manufacturing a nonaqueous electrolyte secondary battery comprising a positive electrode and a negative electrode that are capable of reversibly absorbing and desorbing Li ions;

• and a nonaqueous electrolyte having lithium ion conductivity, the method comprising the steps of:
• (I) forming a first sheet by applying a slurry including active material particles comprising Si to a surface of a collector comprising Cu in an amount of 95 mass % or more, followed by drying;
• (II) forming a second sheet by forming a film comprising at least one element R selected from the group consisting of Sn, In, Ga, Pb and Bi on surfaces of the active material particles;
• and
• (III) forming the negative electrode so that a metallic bond including the element R is formed between a part of the active material particles and the collector by heat-treating the second sheet at a temperature ranging from 80° C. to 350° C. in a non-oxidizing atmosphere.