In the industrial world, efforts are being made to expand the application of a storage battery to smart grids and smart houses. Japan IBM is implementing the plan to build an eco town in collaboration with the city of Sendai, and Fujitsu submitted a plan to build a smart city to Fukushima Prefecture. Sony is addressing a project to build a large lithium-ion battery. However, a large storage battery with a capacity big enough to be built in the transmission network is still in the development stage. The development of a large storage capacity is vital for the stable supply of electricity generated by renewable energy. Every company concerned has entered a period of tough competition.
Sunday, October 30, 2011
No. 340: The performance of a storage battery is improving rapidly (2/2) (October 31, 2011)
NEC developed a lithium-ion battery with an electrode that employs manganese instead of cobalt: manganese is about twentieth of cobalt in price. Besides the low cost electrode, the company modified the ingredient of the electrolyte and succeeded in achieving better performance. The new lithium-ion battery is hard to generate heat and able to discharge and charge for more than 20,000 times. It has a life of 13 years without problems if it is charged during nighttime when electricity rate is low and used during daytime: The existing lithium-ion battery has a life of 7-8 years. The company plans to lengthen the current life of 13 years to 20 years in five years, and subsequently put it on the market.