Abstract: The present invention provides a proton conductor comprising SnP2O7. The present invention also provides a fuel cell that comprising a cathode, an anode, and an electrolyte membrane, in which one of these components comprises SnP2O7. The SnP2O7 has high ionic conductivity of about 10?1 to 10?2 S/cm at about 80° C. or greater when non-humidified. In addition, SnP2O7 is water-insoluble, and stable at high temperatures. These properties make SnP2O7 suitable to act as a non-humidified proton conductor, or a high temperature non-humidified proton conductor.

Abstract: Provided are a nonaqueous electrolyte for improving overcharge safety and a lithium battery using the same. The nonaqueous electrolyte according to the present invention forms a polymer due to its oxidative decomposition even if there is an increase in voltage due to overcharge of a battery by some uncontrollable conditions, so that overcharge current is continuously consumed, thereby protecting the battery. Therefore, overcharge safety of the battery can be enhanced, and occurrence of swelling is reduced. Also, deterioration in formation, standard capacity and cycle life characteristics can be prevented.

Abstract: Disclosed is a positive active material for a rechargeable lithium battery, including a lithiated intercalation compound and an additive compound. The additive compound comprises one or more intercalation element-included oxides which have a charging voltage of 4.0 to 4.6V when 5-50% of total intercalation elements of the one or more intercalation element-included oxides are released during charging.

Abstract: A nonaqueous electrolyte for improving overcharge safety of a lithium battery using the same includes an organic solvent, a lithium salt, and a hydride of a compound represented by the Formula 1: 1

Abstract: A nonaqueous electrolyte for use in improving overcharge safety in a lithium battery includes an organic solvent, a lithium salt, and a benzyl biphenyl compound, a hydride thereof or a mixture thereof.

Abstract: Provided are a nonaqueous electrolyte for improving battery safety by suppressing risks associated with the battery becoming overcharged as a result of certain uncontrolled conditions and a lithium battery with improved overcharge safety. The nonaqueous electrolyte includes an organic solvent, a lithium salt, and a biphenylene oxide based compound.