COIN-TYPE LITHIUM SECONDARY CELL

A coin-type lithium secondary cell (1) for soldering by reflow method includes a positive electrode (2) including a lithium composite oxide, a negative electrode (3), an electrolyte layer (4) provided between the positive electrode (2) and the negative electrode (3) and including an electrolytic solution (42), a cell case (5) having an enclosed space in which the positive electrode (2), the negative electrode (3), and the electrolyte layer (4) are housed. The positive electrode (2) and the negative electrode (3) as a whole contains 3.0% by mass or less of lithium carbonate. Accordingly, it is possible to achieve the coin-type lithium secondary cell (1) with reduced deterioration of performance caused by reflow soldering.