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N－27
Lithium air battery
High-Energy-Density Secondary Battery for Achieving Long-Time Backup of Telecommunication Facilities
■ Metal air batteries can be discharged by using O2 in air. ■ Metal air batteries can be discharged for a very long time,
because O2 (positive active material) is always provided to the batteries and negative active materials are stored in them.
■ Many organizations have been developing rechargeable metal air batteries. Lithium air batteries are a possible candidate as secondary metal battery with the highest energy density.
■ Lithium air batteries have less need for expensive materials (Li, Co, etc.) than lithium ion batteries (LIBs).
■ Making telecommunication infrastructures more tolerant to major disasters through the use of high-energy-density batteries to provide longer back-up time for supplying electric power to telecommunication facilities.
Features
Application Scenarios
NTT Group Global Advantage Lithium air batteries are being actively researched as one of the post-LIB candidates. NTT has been researching original catalysts used for the positive reaction to improve the battery performance factors such as the discharge-charge property.
NTT installs back-up systems for providing electric power for telecommunication facilities to maintain telecommunication service even in case of power outages. Since the Great East Japan Earthquake, back-up time has needed to be extended to withstand power outages. To help meet this need, we have been developing lithium air batteries that can be discharged for a very long time.
Energy & Environment
Battery Negative ele. Positive ele. Voltage (V) Theoretical energy density (Wh/kg)
Lithium air Li Air (O2) 3.1 5574
Lithium ion Carbon LiCoO2 3.7 600
Pb acid Pb PbO2 2.1 241
Li
Li O
Li+
O2
O2
O2
Li+
Li+
Negative electrode (-) Positive electrode (+)
e-
e-
Electrode (active) material, voltage, theoretical energy density of various secondary batteries
Carbon, catalyst
Separator
O
Li metal Electrolyte
Energy & Environment
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