title: Metal Organic Frameworks Derived Hierarchical Hollow NiO/Ni/Graphene Composites for Lithium and Sodium Storage.
abstract: Ni-based metal organic frameworks (Ni-MOFs) with unique hierarchical hollow ball-in-ball nanostructure were synthesized by solvothermal reactions. After successive carbonization and oxidation treatments, hierarchical NiO/Ni nanocrystals covered with a graphene shell were obtained with the hollow ball-in-ball nanostructure intact. The resulting materials exhibited superior performance as the anode in lithium ion batteries (LIBs): they provide high reversible specific capacity (1144 mAh/g), excellent cyclability (nearly no capacity loss after 1000 cycles) and rate performance (805 mAh/g at 15 A/g). In addition, the hierarchical NiO/Ni/Graphene composites demonstrated promising performance as anode materials for sodium-ion batteries (SIBs). Such a superior lithium and sodium storage performance is derived from the well-designed hierarchical hollow ball-in-ball structure of NiO/Ni/Graphene composites, which not only mitigates the volume expansion of NiO during the cycles but also provides a continuous highly conductive graphene matrix to facilitate the fast charge transfer and form a stable SEI layer.
authors.affiliation: Department of Polymer Science, University of Akron , Akron, Ohio 44325, United States.
authors.forename: Feng
authors.initials: F
authors.lastname: Zou
authors.affiliation: Department of Polymer Science, University of Akron , Akron, Ohio 44325, United States.
authors.forename: Yu-Ming
authors.initials: YM
authors.lastname: Chen
authors.affiliation: Department of Polymer Science, University of Akron , Akron, Ohio 44325, United States.
authors.forename: Kewei
authors.initials: K
authors.lastname: Liu
authors.affiliation: Department of Polymer Science, University of Akron , Akron, Ohio 44325, United States.
authors.forename: Zitian
authors.initials: Z
authors.lastname: Yu
authors.affiliation: Department of Polymer Science, University of Akron , Akron, Ohio 44325, United States.
authors.forename: Wenfeng
authors.initials: W
authors.lastname: Liang
authors.affiliation: Department of Polymer Engineering, University of Akron , Akron, Ohio 44325, United States.
authors.forename: Sarang M
authors.initials: SM
authors.lastname: Bhaway
authors.affiliation: Liquid Crystal Institute, Kent State University , Kent, Ohio 44242, United States.
authors.forename: Min
authors.initials: M
authors.lastname: Gao
authors.affiliation: Department of Polymer Science, University of Akron , Akron, Ohio 44325, United States.
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhu
keywords: hierarchical structure; lithium ion battery; metal organic framework; nickel oxide; sodium ion battery