Technology:
Sumitomo Electric and Kyoto University jointly succeeded in improving the performance of
a sodium ion battery. Although a sodium-ion battery needs a temperature higher
than 57 degrees centigrade to operate, they successfully made it operational at
20 degrees centigrade in an experiment. They confirmed that the trial product allowed
for 1,000 discharges and charges. They used molten salt in which sodium is
dissolved to build this trial product. They also opened the door to the practical
application for the storage system of housing that requires durability of10
years.
They
expect that a sodium-ion battery can be sold for 100,000-200,000 yen/kWh, which
is almost the same as a lithium-ion battery. A sodium-ion battery is inferior
to a lithium-ion battery in capacity, but it makes a storage system smaller because
it can simplify equipment to release heat. Because the newly developed sodium
ion battery is now operational at room temperature, it does not need a heater to
start generating electricity. Sumitomo Electric wishes to launch the newly
developed sodium-ion battery for the storage system that stores electricity
generated by photovoltaic generation toward 2015. The research results will be
presented in the 54th Battery Symposium in Japan scheduled for October 7-9 in
Osaka.
Towards high energy density
sodium-ion batteries
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