Abstract: Provided is a biphasic electrolyte solution including: an aqueous electrolyte solution layer including a kosmotropic metal salt and water; and a nonaqueous electrolyte solution layer including a second metal salt and a nonaqueous organic solvent, and the biphasic electrolyte solution may provide a battery which satisfies both excellent battery performance and life characteristics.

Abstract: The present invention relates generally to a method and apparatus capable of transmitting/receiving a message between persons carrying devices of the same kind, together with a desired reproduction time of the message, when the devices are connected to or come close to each other. The message exchanging method according to the present invention comprises the steps of storing a message and its desired reproduction time; checking whether an outer device is the device of the same kind based on a signal from the outer device; transmitting the message and its reproduction time to the outer device according to the check result; and reproducing the message in the outer device at the reserved time for reproduction of the message. According to the present invention, it is possible to let persons who carry portable device of the same kind for exchanging private messages listen to the messages at the desired time, which is set by the person at the transmission side.