The present invention is to provide: a liquid electrolyte for batteries, which has excellent stability to lithium metals; a method for producing the liquid electrolyte; and a lithium battery comprising the liquid electrolyte. Disclosed is a liquid electrolyte for lithium batteries, wherein the liquid electrolyte comprises a mesoionic compound represented by the following general formula (1): wherein R 1 is an aliphatic hydrocarbon group having 1 to 3 carbon atoms, and R 2 is a group represented by any one of the following general formulae (2), (3) and (4): General Formula (2): -C 1 H 21 - (OCH 2 ) m -C n H 2n+1 ; General Formula (3) : -C x H 2x - (CH 2 OCH 2 ) y -C z H 2z+1 ; and General Formula (4) : -C p H 2p -(C 2 H 4 OCH 2 ) q -C r H 2r+1 .