Patent ID: 8808407

Claim:
A method of manufacturing a lithium ion secondary battery comprising the steps of: forming a laminate by laminating an electrolyte green sheet and a positive electrode green sheet; and sintering the laminate, wherein a total amount of a first oxide glass powder contained in the electrolyte green sheet and a second oxide glass powder contained in the positive electrode green sheet is in a range of 50 wt % to 75 wt% of a total weight of the electrolyte green sheet and the positive electrode green sheet, wherein the first oxide glass powder and the second oxide glass powder contain: 10 to 25 mol % of Li 2 O, 0.5 to 15 mol % of Al 2 O 3 and/or Ga 2 O 3 , 25 to 50 mol % of TiO 2 and/or GeO 2 , 0 to 15 mol % of SiO 2 , and 26 to 40 mol % of P 2 O 5 , wherein the positive electrode green sheet contains the second oxide glass powder in which a crystalline phase having a lithium ion conducting property is precipitated in the step of sintering at a sintering temperature such that an average particle diameter of the crystalline phase is not exceeding 1 μm.