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Title: Origin of Fracture-Resistance to Large Volume Change in Cu-Substituted Co3O4 Electrodes

Journal Article · · Advanced Materials

The electrode materials conducive to conversion reactions undergo large volume change in cycles which restrict their further development. It has been demonstrated that incorporation of a third element into metal oxides can improve the cycling stability while the mechanism remains unknown. Here in this work, an in situ and ex situ electron microscopy investigation of structural evolutions of Cu-substituted Co3O4 supplemented by first-principles calculations is reported to reveal the mechanism. An interconnected framework of ultrathin metallic copper formed provides a high conductivity backbone and cohesive support to accommodate the volume change and has a cube-on-cube orientation relationship with Li2O. In charge, a portion of Cu metal is oxidized to CuO, which maintains a cube-on-cube orientation relationship with Cu. The Co metal and oxides remain as nanoclusters (less than 5 nm) thus active in subsequent cycles. Finally, this adaptive architecture accommodates the formation of Li2O in the discharge cycle and underpins the catalytic activity of Li2O decomposition in the charge cycle.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Electrical Energy Storage (CEES)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
Grant/Contract Number:
AC02-06CH11357; AC02‐05CH11231; NSF NNCI-1542205; NSF DMR-1720139; AC02-05CH11231
OSTI ID:
1470177
Alternate ID(s):
OSTI ID: 1412574
Journal Information:
Advanced Materials, Vol. 30, Issue 4; Related Information: CEES partners with Argonne National Laboratory (lead); University of Illinois, Urbana-Champaign; Northwest University; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

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