Lithium metal secondary battery and method for producing the same

A lithium metal secondary battery comprising:

• a positive electrode;
• a negative electrode;
• a separator disposed between the positive electrode and the negative electrode;
• and
• a nonaqueous electrolyte, wherein:
• the positive electrode includes a positive electrode active material that performs a lithium-ion insertion reaction during discharging and that performs a lithium-ion extraction reaction during charging,
• the negative electrode performs a reaction in which lithium metal is deposited during the charging and performs a reaction in which lithium metal is dissolved during the discharging,
• the positive electrode and the negative electrode are wound to form an electrode group,
• the positive and negative electrodes face each other with the separator between the positive and negative electrodes,
• the electrode group has a space for accommodating at least part of the nonaqueous electrolyte when fully discharged, and
• 1.01≤X/Y<1.20 is satisfied, where Xis a calculated thickness of the lithium metal which is calculated from:
• X=design capacity per unit area of the positive electrode/(theoretical capacity of the lithium metal×density of the lithium metal), and
• Y is a virtual thickness of the space when the space is assumed to be formed only between the negative electrode and the separator.