Boost for Energy Storage Systems
Monday, September 12 2011
A team led by Hansan Liu, Gilbert Brown, and Parans Paranthaman of the Chemical Sciences Division found that titanium dioxide creates a highly desirable material that increases surface area and features a fast charge-discharge capability for lithium ion batteries.
"We can charge our battery to 50 percent of full capacity in six minutes while the traditional graphite-based lithium ion battery would be just 10 percent charged at the same current," Liu said.
Compared to commercial lithium titanate material, the ORNL compound also boasts a higher capacity - 256 vs. 165 milliampere hour per gram - and a sloping discharge voltage that is good for controlling state of charge. This characteristic combined with the fact oxide materials are extremely safe and long-lasting alternatives to commercial graphite make it well-suited for hybrid electric vehicles and other high-power applications.