Batteries – Better graphite anodes …
Lithium-ion batteries for cars, phones, laptop computers and other devices could retain their charge more effectively and last longer because of a method developed at Oak Ridge National Laboratory. By employing a proprietary additive to the furnace gas used during processing of natural graphite, the ORNL team produced anodes that enable a coin cell to retain up to 75 percent of its charge capacity after 1,600 to 2,000 cycles. This represents a significant improvement over the baseline version’s 67 percent after 1,400 cycles. Researchers noted that their patent-pending technique stabilizes the graphite surface, reduces cost and lowers temperature requirements. These advances allow processing to be done with less expensive furnaces and less energy. The method could also help the U.S. graphite industry gain a competitive edge over overseas sources. Findings were published in the journal CARBON.
August 05, 2014