Enhanced Lithium Storage Performance of CuO Nanowires by Coating of Graphene Quantum Dots

Zhu, Changrong; Chao, Dongliang; Sun, Jing; Mínguez-Bacho, Ignacio; Fan, Zhanxi; Ng, Charles W. W.; Xia, Xinhui; Huang, Hui; Zhang, Hua; Shen, Zexiang; Ding, Guqiao; Fan, Hong Jin

doi:10.1002/admi.201400499

Cited by 111 publications

(80 citation statements)

References 45 publications

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“…However, crystallographically aligned oxide formation occurs only when lattice strain is small enough for energetically feasible hetero-epitaxial growth. In this case, the bi-layer will be in a local minimum energy state if the m th atom of the overgrowth coincides with the n th atom of the substrate surface layer [16][17][18][19][20]. For moiré fringes generated by two sets of planes across an interface with spacing d1 = d 220(Cu2O) and d2 = d 220(Cu) , the number of planes n of spacing d2 between the moiré repeat is given by n = d2/(d1-d2) [21].…”

Section: Epitaxial Growth and Structure Of Cu/cu 2 O/cuo Ns-nwsmentioning

confidence: 99%

Epitaxial growth of hyperbranched Cu/Cu2O/CuO core-shell nanowire heterostructures for lithium-ion batteries

Zhao

Zhang

Zhao³

et al. 2015

Nano Res.

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The careful design of nano-architectures and smart hybridization of expected active materials can lead to more advanced properties. Here we have engineered a novel hierarchical branching Cu/Cu 2 O/CuO heteronanostructure by combining a facile hydrothermal method and subsequent controlled oxidation process. The fine structure and epitaxial relationship between the branches and backbone are investigated by high-resolution transmission electron microscopy. Moreover, the evolution of the branch growth has also been observed during the gradual oxidation of the Cu nanowire surface. The experimental results suggest that the surface oxidation needs to be performed via a two-step exposure process to varying humidity in order to achieve optimized formation of a core-shell structured branching architecture. Finally, a proof-of-concept of the function of such a hierarchical framework as the anode material in lithium-ion batteries is demonstrated. The branching core-shell heterostructure improves battery performance by several means: (i) The epitaxially grown branches provide a high surface area for enhanced electrolyte accessibility and high resistance to volume change induced by Li + intercalation/extraction; (ii) the core-shell structure with its well-defined heterojunction increases the contact area which facilitates effective charge transport during lithiation; (iii) the copper core acts as a current collector as well as providing structural reinforcement.

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Section: Epitaxial Growth and Structure Of Cu/cu 2 O/cuo Ns-nwsmentioning

confidence: 99%

Epitaxial growth of hyperbranched Cu/Cu2O/CuO core-shell nanowire heterostructures for lithium-ion batteries

Zhao

Zhang

Zhao³

et al. 2015

Nano Res.

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“…Indeed, GQDs have been reported to serve as a composite member or coating material for energy storage devices. 23,24 The current study is the first to introduce a GQDs-sulfur composite in a Li-S battery. Nano-sized GQDs (an average particle size of 4 nm) enriched in oxygen functional groups could enhance the structural integrity of a conventional micron-sized sulfur-carbon electrode composite, forming a tightly packed structure.…”

Section: Introductionmentioning

confidence: 99%

Graphene quantum dots: structural integrity and oxygen functional groups for high sulfur/sulfide utilization in lithium sulfur batteries

et al. 2016

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Lithium-sulfur (Li-S) batteries are expected to overcome the limit of current energy storage devices by delivering high specific energy with low material cost. However, the potential of Li-S batteries has not yet been realized because of several technical barriers. Poor electrochemical performance is mainly attributed to the low electrical conductivity of the fully charged and discharged species, the irreversible loss of polysulfide anions and the decrease in the number of electrochemically active reaction sites during battery operation. Here, we report that the introduction of graphene quantum dots (GQDs) into the sulfur cathode dramatically enhanced sulfur/sulfide utilization, yielding high performance. In addition, the GQDs induced structural integrity of the sulfur-carbon electrode composite by oxygen-rich functional groups. This hierarchical architecture enabled fast charge transfer while minimizing the loss of lithium polysulfides, which is attributed to the physicochemical properties of GQDs. The mechanisms through which excellent cycling and rate performance are achieved were thoroughly studied by analyzing capacity versus voltage profiles. Furthermore, experimental observations and theoretical calculations further clarified the role played by GQDs by proving that C-S bonding occurs. Thus, the introduction of GQDs into Li-S batteries will provide an important breakthrough allowing their use as high-performance and low-cost batteries for next-generation energy storage systems. INTRODUCTIONRechargeable lithium-ion batteries are widely used in various applications, such as portable devices, bio-medical implants and electric vehicles, because of their high energy and power density. 1,2 However, current lithium-ion batteries based on the graphite and transition metal oxide couple have nearly reached their ceiling with respect to storage capability because of the limitations associated with their electrical properties and crystal structure. Therefore, breakthroughs in new energy storage systems that can surpass the current performance barrier of lithium-ion batteries should be brought about in a timely manner. Recently, Li-S batteries that can operate by the reversible electrochemical transformation between sulfur (S 8 ) and dilithium sulfide (Li 2 S) have attracted great attention because they can deliver high energy with a moderate voltage owing to the direct use of

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“…Among the explored transition metal oxides, CuO is considered as one of the most promising candidates due to its high theoretical capacity (674 mAh g -1 ), low cost, chemical stability and environmental friendliness [1,9,10]. However, its practical application for LIBs is still hampered by two main issues: poor reaction kinetics and significant capacity fading at long-term electrochemical cycling [11,12]. The above problems are mainly due to the low electrical conductivity of CuO and its severe mechanical degradation and pulverization arising from the large volume change during the cycling [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…Particularly, one-dimensional (1D) nanostructures such as nanowires are demonstrated to manifest high capacity and enhance cycling stability due to their fast transfer of electron/ion and more stable structure during cycling [18][19][20]. The other promising strategy is to integrate CuO active materials into conductive matrixes (such as carbon, metal and conducting polymers) to construct smart hybrid architectures [1,9,11,13,16], in which structural features and electro-activities of each component are fully manifested [21]. Impressively, it has been proven that the introduction of carbon-based matrix or carbon coating on the metal oxides could significantly enhance electrochemical performance for LIBs, especially at high-rate capability.…”

Section: Introductionmentioning

confidence: 99%

Construction of carbon nanoflakes shell on CuO nanowires core as enhanced core/shell arrays anode of lithium ion batteries

Cao

Xia

Pan

et al. 2015

Electrochimica Acta

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Enhanced Lithium Storage Performance of CuO Nanowires by Coating of Graphene Quantum Dots

Abstract: Interfaces, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. It incorporates referee's comments but changes resulting from the publishing process, such as copyediting,

Cited by 111 publications

References 45 publications

Epitaxial growth of hyperbranched Cu/Cu2O/CuO core-shell nanowire heterostructures for lithium-ion batteries

Epitaxial growth of hyperbranched Cu/Cu2O/CuO core-shell nanowire heterostructures for lithium-ion batteries

Graphene quantum dots: structural integrity and oxygen functional groups for high sulfur/sulfide utilization in lithium sulfur batteries

Construction of carbon nanoflakes shell on CuO nanowires core as enhanced core/shell arrays anode of lithium ion batteries

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