TY - JOUR
T1 - Three-dimensionally scaffolded Co3O4 nanosheet anodes with high rate performance
AU - Liu, Jinyun
AU - Kelly, Sean J.
AU - Epstein, Eric S.
AU - Pan, Zeng
AU - Huang, Xingjiu
AU - Liu, Jinhuai
AU - Braun, Paul V.
N1 - Funding Information:
This research was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences ( DE-FG02-07ER46471 ). Xingjiu Huang and Jinhuai Liu acknowledge support of the State Key Project of Fundamental Research for Nanoscience and Nanotechnology of China ( 2011CB933700 ), and the One Hundred Person Project of the Chinese Academy of Sciences .
PY - 2015/12/20
Y1 - 2015/12/20
N2 - Advances in secondary batteries are required for realization of many technologies. In particular, there remains a need for stable higher energy batteries. Here we suggest a new anode concept consisting of an ultrathin Co3O4 nanosheet-coated Ni inverse opal which provides high charge-discharge rate performance using a material system with potential for high energy densities. Via a hydrothermal process, about 4 nm thick Co3O4 nanosheets were grown throughout a three-dimensional Ni scaffold. This architecture provides efficient pathways for both lithium and electron transfer, enabling high charge-discharge rate performance. The scaffold also accommodates volume changes during cycling, which serves to reduce capacity fade. Because the scaffold has a low electrical resistance, and is three-dimensionally porous, it enables most of the electrochemically active nanomaterials to take part in lithiation-delithiation reactions, resulting in a near-theoretical capacity. On a Co3O4 basis, the Ni@Co3O4 electrode possesses a capacity of about 726 mAh g-1 at a current density of 500 mA g-1 after 50 cycles, which is about twice the theoretical capacity of graphite. The capacity is 487 mAh g-1, even at a current density of 1786 mA g-1.
AB - Advances in secondary batteries are required for realization of many technologies. In particular, there remains a need for stable higher energy batteries. Here we suggest a new anode concept consisting of an ultrathin Co3O4 nanosheet-coated Ni inverse opal which provides high charge-discharge rate performance using a material system with potential for high energy densities. Via a hydrothermal process, about 4 nm thick Co3O4 nanosheets were grown throughout a three-dimensional Ni scaffold. This architecture provides efficient pathways for both lithium and electron transfer, enabling high charge-discharge rate performance. The scaffold also accommodates volume changes during cycling, which serves to reduce capacity fade. Because the scaffold has a low electrical resistance, and is three-dimensionally porous, it enables most of the electrochemically active nanomaterials to take part in lithiation-delithiation reactions, resulting in a near-theoretical capacity. On a Co3O4 basis, the Ni@Co3O4 electrode possesses a capacity of about 726 mAh g-1 at a current density of 500 mA g-1 after 50 cycles, which is about twice the theoretical capacity of graphite. The capacity is 487 mAh g-1, even at a current density of 1786 mA g-1.
KW - Anode
KW - High power
KW - Mesostructured electrode
KW - Nanostructure
KW - Secondary battery
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U2 - 10.1016/j.jpowsour.2015.08.078
DO - 10.1016/j.jpowsour.2015.08.078
M3 - Article
AN - SCOPUS:84940765851
VL - 299
SP - 40
EP - 48
JO - Journal of Power Sources
JF - Journal of Power Sources
SN - 0378-7753
M1 - 21626
ER -