Metal-air cell provided with gel-form solid electrolyte

A lithium-air secondary cell comprising:

• an air electrode;
• a negative electrode containing metal lithium or a lithium-containing material;
• and
• a gel-form solid electrolyte, wherein
• the gel-form solid electrolyte contains a solid electrolyte salt, a solvent, and a lipid peptide-type gelator composed of at least one of compounds of Formulae (1) to (3):
• (where R1 is a C9-23 aliphatic group, R2 is a hydrogen atom or a C1-4 alkyl group optionally having a C1 or C2 branched chain, R3 is a —(CH2)n—X group, n is a number of 1 to 4, and X is an amino group, a guanidino group, a —CONH2 group, a 5-membered ring optionally having 1 to 3 nitrogen atoms, a 6-membered ring optionally having 1 to 3 nitrogen atoms, or a condensed heterocycle that is composed of a 5-membered ring and a 6-membered ring and optionally has 1 to 3 nitrogen atoms),
• (where R4 is a C9-23 aliphatic group, each of R5 to R7 is independently a hydrogen atom, a C1-4 alkyl group optionally having a C1 or C2 branched chain, or a —(CH2)n—X group, n is a number of 1 to 4, and X is an amino group, a guanidino group, a —CONH2 group, a 5-membered ring optionally having 1 to 3 nitrogen atoms, a 6-membered ring optionally having 1 to 3 nitrogen atoms, or a condensed heterocycle that is composed of a 5-membered ring and a 6-membered ring and optionally has 1 to 3 nitrogen atoms), and
• (where R8 is a C9-23 aliphatic group, each of R9 to R12 is independently a hydrogen atom, a C1-4 alkyl group optionally having a C1 or C2 branched chain, or a —(CH2)n—X group, n is a number of 1 to 4, and X is an amino group, a guanidino group, a —CONH2 group, a 5-membered ring optionally having 1 to 3 nitrogen atoms, a 6-membered ring optionally having 1 to 3 nitrogen atoms, or a condensed heterocycle that is composed of a 5-membered ring and a 6-membered ring and optionally has 1 to 3 nitrogen atoms), and
• pharmaceutically acceptable salts of the compounds.