| abstract |
PROBLEM TO BE SOLVED: To provide a lithium secondary battery which suppresses a decrease in battery capacity and an increase in internal resistance in charge / discharge cycle operation, and a method for producing a positive electrode active material suitably used for the lithium secondary battery. . SOLUTION: An internal electrode body 1 formed by winding or laminating a positive electrode plate 2 and a negative electrode plate 3 so as not to directly contact with each other via a separator 4 is accommodated in a battery case, and a lithium secondary battery using an organic electrolyte is used. Next battery. Secondary particles of the positive electrode active material consisted of primary particles whose surface was covered with acetylene black, and a positive electrode active material layer was formed using the secondary particles. |