Jiajun Wang, Karen Chen and Jun Wang prepare a sample for study at NSLS beamline X8C. Using a new method to track the electrochemical reactions in a common electric vehicle battery material under operating conditions, scientists at the U.S. Department of Energy’s Brookhaven National Laboratory have revealed new insight into why fast charging inhibits this material’s performance. The study also provides the first direct experimental evidence to support a particular model of the electrochemical reaction. The results, published August 4, 2014, in Nature Communications, could provide guidance to inform battery makers’ efforts to optimize materials for faster-charging batteries with higher capacity. “This is the first time anyone has been able to see that delithiation was happening differently at different spatial locations on an electrode under rapid charging conditions.” — Brookhaven physicist Jun Wang “Our work was focused on developing a method to track structural and electrochemical changes at the nanoscale as the battery material was charging,” said Brookhaven physicist Jun Wang, who led the research. Her group was particularly interested in chemically mapping what happens in lithium iron phosphate—a material commonly used in the cathode, or positive electrode, of electrical vehicle batteries—as the battery charged. “We wanted to catch and monitor
The post Nanoscale details of electrochemical reactions in electric vehicle battery materials has been published on Technology Org.
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