LITHIUM SECONDARY BATTERY

Provided is a lithium secondary battery that is of the integrated sintered plate type in which a positive electrode layer, a ceramic separator, and a negative electrode layer are bonded together and that can suppress delamination in the integrated sintered plate due to physical impact during battery assembly and deterioration in capacity due to storage in a charged state. The lithium secondary battery includes a positive electrode layer composed of a lithium complex oxide sintered body, a negative electrode layer composed of a titanium-containing sintered body, a ceramic separator interposed between the positive electrode layer and the negative electrode layer, an electrolyte with which at least the ceramic separator is impregnated, and an exterior body including a closed space, the closed space accommodating the positive electrode layer, the negative electrode layer, the ceramic separator, and the electrolyte. The positive electrode layer, the ceramic separator, and the negative electrode layer form one integrated sintered plate as a whole, and the entirety of the integrated sintered plate is coated with a metal oxide layer.