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Web Date: October 11, 2017

Making a safer lithium-ion battery

Electrode coating brings performance of nonflammable aqueous batteries more in line with commercial devices
Department: Science & Technology
Keywords: Energy storage, lithium ion batteries, aqueous, fluorinated polymer coating, safer, exploding batteries
Making a safer lithium-ion battery
Researchers at the University of Maryland and the Army Research Lab are building lithium-ion batteries that won’t explode when damaged.
Credit: C&EN

The lithium-ion batteries in our electronic devices use organic electrolytes to help store charge. The problem is that these electrolytes are flammable. Li-ion batteries that replace those electrolytes with water-based versions remove the risk of explosions but don’t perform as well.

To tackle this shortcoming, a team of researchers led by the University of Maryland’s Chunsheng Wang and the U.S. Army Research Lab’s Kang Xu have developed a fluorinated polymer coating that protects the anode in aqueous batteries. By shielding the anode from degradation by the water-based electrolyte, the coating enables the batteries to reach 4.0 V—the voltage level of today’s commercial Li-ion batteries (Joule 2017, DOI: 10.1016/j.joule.2017.08.009).

 
Chemical & Engineering News
ISSN 0009-2347
Copyright © American Chemical Society
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