Negative electrode for magnesium secondary batteries and method for producing same, and magnesium secondary battery

A method for producing a negative electrode for magnesium secondary batteries, including the steps of:

• providing a current collector having a 1st underlying layer including a metal having a higher ionization tendency than magnesium, wherein the 1st underlying layer is formed on a surface of the current collector;
• forming a 1st magnesium layer on the current collector by a chemical plating method using the 1st underlying layer as a base material, and
• subsequently repeating a process from n=1 to n=N−1 to form a negative electrode active material layer including magnesium layers laminated on each other on the current collector,
• the process including:
• forming a (n+1)th underlying layer including the metal having a higher ionization tendency than magnesium on a nth (wherein n=1, 2, . . . , N−1;
• and N represents an integer of 2 or greater) magnesium layer;
• and
• forming a (n+1)th magnesium layer on the nth magnesium layer by the chemical plating method using the (n+1)th underlying layer as a base material.

A negative electrode for magnesium secondary batteries, comprising:

• a current collector, and
• a negative electrode active material layer including magnesium,
• wherein the negative electrode active material layer is provided on a surface of the current collector, and
• wherein a value of a BET specific surface area of the negative electrode active material layer is 1 m2 or more per 1 gram of the negative electrode active material layer.