Importantly, the team developed a method for producing boundary-free single crystals. Patent protection around the concept and. It turned out that what scientists had believed were single crystals actually had boundaries inside that had not been detected before. In 1998, while at Argonne National Laboratory, he led a team that first reported the NMC cathode technology. So, they subjected these cathode materials to extensive analyses at the Advanced Photon Source and Center for Nanoscale Materials, DOE Office of Science user facilities at Argonne. The problem the team faced was that cathodes made from both coated polycrystals and single crystals still formed cracks with cycling. Electron microscopy of these particles indicated they have no boundaries. As a result, they have what scientists refer to as grain boundaries between particles, which cause cracking upon battery cycling.Ī past approach to avoid this cracking involves use of single-crystal particles. The large spherical particles are polycrystalline, with differently oriented crystalline regions. One past approach involved microscale spherical particles consisting of numerous much smaller particles. For several decades, battery researchers have been seeking ways to eliminate these cracks. With charge-discharge cycling, performance rapidly declines due to cracks forming in the cathode particles. "The present-day NMC cathode has posed a major barrier to operation at high voltage," said Guiliang Xu, assistant chemist. The team's new structure for the cathode's micro-sized particles could lead to longer-lasting and safer batteries able to operate at very high voltage and power vehicles for longer driving ranges. Batteries with this cathode now power the Chevy Bolt.Īrgonne researchers have made another breakthrough with the NMC cathode. Many of these discoveries have focused on a battery cathode known as NMC, a nickel-manganese-cobalt oxide. Department of Energy's (DOE) Argonne National Laboratory have a long history of breakthrough discoveries with lithium-ion batteries. LEMONT, Ill., September 08, 2022-( BUSINESS WIRE)-Researchers at the U.S.
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