The lithium secondary battery 10 preferably further includes a positive electrode current collector 14 and/or a negative electrode current collector 18. The positive electrode current collector 14 and the negative electrode current collector 18 are not specifically limited but are preferably metal foils such as copper foils and aluminum foils. The positive electrode current collector 14 is preferably interposed between the positive electrode plate 12 and the positive electrode can 24a, and the negative electrode current collector 18 is preferably interposed between the negative electrode plate 16 and the negative electrode can 24b. Further, a positive side carbon layer 13 is preferably provided between the positive electrode plate 12 and the positive electrode current collector 14 for reducing the contact resistance. Likewise, a negative side carbon layer 17 is preferably provided between the negative electrode plate 16 and the negative electrode current collector 18 for reducing the contact resistance. Both the positive side carbon layer 13 and the negative side carbon layer 17 are preferably composed of a conductive carbon and may be formed, for example, by applying a conductive carbon paste by screen printing or the like.

Method for Producing Positive Electrode Plate

The positive electrode plate 12, that is, the lithium complex oxide sintered plate may be produced by any method and is preferably produced through (a) preparation of a green sheet containing a lithium complex oxide, (b) preparation of a green sheet containing an excess-lithium source, as required, and (c) laminating and firing of the green sheets.

(a) Preparation of Green Sheet Containing Lithium Complex Oxide