Reversible Lithium Storage at Highly Populated Vacant Sites in an Amorphous Vanadium Pentoxide Electrode

Chae, Oh B.; Kim, Jisun; Park, In-Chul; Jeong, Hyejeong; Ku, Jun H.; Ryu, Ji Heon; Kang, Kisuk; Oh, Seung M.

doi:10.1021/cm502268u

Cited by 142 publications

(96 citation statements)

References 44 publications

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“…Low crystallization has been shown to accelerate the lithium ion interaction in the bulk. 17,18 The lattice constants calculated from the X-ray diffraction results were a = 5.454, b = 6.322 and c = 4.954 Å for pristine LVO and a = 5.543, b = 6.323 and c = 4.965 Å for Ni-LVO. The change in lattice constants could be derived from the larger radius of Ni 2+ (0.69 Å) than V 5+ (0.54 Å), thus suggesting the incorporation of nickel into the LVO crystal structure.…”

Section: Resultsmentioning

confidence: 98%

Effects of high surface energy on lithium-ion intercalation properties of Ni-doped Li3VO4

et al. 2016

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Nickel was doped into Li 3 VO 4 (Ni-LVO) successfully via a facile room temperature reaction, and the resulting Ni-LVO nanocrystallites showed excellent lithium-ion storage properties with a capacity of 650 mAh g − 1 at 50 mAh g − 1 and excellent capacity stability as an anode in lithium-ion batteries, maintaining nearly 100% of the initial reversible capacity after 800 cycles at 1 A g − 1 . The superior electrochemical properties arose largely from the nickel doping in the Ni-LVO. The surface energy of the electrode material was analyzed by an inverse gas chromatography method, and the Ni-LVO surface energy, 43.91 mJ m − 2 , was much higher than the 30.74 mJ m − 2 of Li 3 VO 4 . X-ray photoelectron spectra results demonstrated that nickel doping promoted the formation of tetravalent vanadium ions, V 4+ , as well as a more amorphous surface of Li 3 VO 4 , thus probably resulting in more nucleation sites for the phase transformation and reduced activation energy of the redox reactions and phase transition during the lithium-ion intercalation/extraction processes. NPG Asia Materials (2016) 8, e287; doi:10.1038/am.2016.95; published online 22 July 2016 INTRODUCTION Li 3 VO 4 (LVO), whose structure consists of corner-sharing VO 4 and LiO 4 tetrahedra, has been studied as a promising anode material for lithium-ion batteries. 1,2 It possesses several advantages over other anode materials. First, LVO has a small structural and volume change during lithiation/delithiation processes, thus resulting in good cyclic durability. 3 Second, it has high ionic conductivity (~10 − 4 S cm − 1 ), which facilitates the effective diffusion of lithium ions in bulk. 4 Third, compared with Li 4 Ti 5 O 12 , LVO can intercalate lithium ions in a low-voltage region (between 0.5 and 1.0 V vs Li/Li + ), thus eventually offering a high full cell energy density and maintaining good safety. 3,5 Finally, the hollow, lantern-like, three-dimensional structure of LVO crystal provides many empty sites to accommodate lithium ions and serves as lithium ion insertion channels. Theoretical calculations indicate that the inserted lithium ions have two different Wyckoff sites, which are stably occupied by three external lithium ions corresponding to a theoretical capacity of 591 mAh g − 1 when discharged to 0.01 V vs Li/Li + . 6 Despite these advantages, LVO suffers from low electrical conductivity, which may cause large polarization and poor rate capability. Hybridization with carbon materials such as graphite, 7,8 carbon nanotubes 9 and graphene 10,11 and reduction of the LVO particle size have been proven to be effective ways to enhance electrical conductivity and abate polarization. For example, carbon-encapsulated LVO nanoparticles synthesized by a simple solid-state method exhibit excellent rate capability and long cycling performance. 1 In addition, defects introduced by doping, thermal treatment at an inert or

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Section: Resultsmentioning

confidence: 98%

Effects of high surface energy on lithium-ion intercalation properties of Ni-doped Li3VO4

et al. 2016

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“…The large number of under-coordinated atoms (good electron acceptors) and reactive sites at the surface means that amorphous materials also have the advantage over crystalline ones in their contact with the electrolyte and active substances (electron donors), which favors electrochemical processes. In regard to the merits discussed above, amorphous nanomaterials have already demonstrated their superior performance over bulk crystalline materials in various electrochemical applications, including lithium-and/or sodium-ion batteries [51,62,66,71,79,84,[96][97][98][99][100], super-or pseudo-capacitors [77,78,83], electrochemical water splitting [59] and sensors [72,81]. The amorphous CoSnO 3 @C nanoboxes reported by Wang et al [79] showed high initial discharge and charge capacities of around 1,410 and 480 mA h g −1 , respectively, as revealed in Fig.…”

Section: Applications Electrochemical Electrode Materialsmentioning

confidence: 99%

Tailoring the shape of amorphous nanomaterials: recent developments and applications

2015

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Nanoscale amorphous materials are very important member of the non-crystalline solids family and have emerged as a new category of advanced materials. However, morphological control of amorphous nanomaterials is very difficult because of the atomic isotropy of their internal structures. In this review, we introduce some emerging innovative methods to fabricate well-defined, regular-shaped amorphous nanomaterials. We then highlight some examples to evaluate the use of these amorphous materials in electrodes, and their optical response. There is still plenty of room to explore the amorphous world. As researchers continue to advance the scientific tools that underpin the concepts related to "amorphous", additional applications of these materials will emerge. Their controlled synthesis will undoubtedly attain new heights in the discipline of nanomaterials, and allow nanoscale amorphous materials to become more sophisticated, diverse, and mainstream.

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“…[9,46] As exemplified in some reports, some amorphous aerogels or xerogel prepared are featured with low density, highly porous and high surface area and are being explored as new promising materials in electrochemistry. [47][48][49][50][51] Gao et al demonstrated amorphous V 2 O 5 exhibited superior Na storage performance compared with its crystalline counterpart. [52] No distinctive peak can be observed when the cyclic voltammetry (CV) scan was conducted on this amorphous V 2 O 5 , however the current response was scaled with the potential and was even greater than that of the crystalline counterpart.…”

Section: Amorphous V 2 Omentioning

confidence: 99%

Nanostructured layered vanadium oxide as cathode for high-performance sodium-ion batteries: a perspective

2017

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Sodium-ion batteries (SIBs) have received intensive attentions owing to the abundant and inexpensive sodium (Na) resource. Layered vanadium oxides are featured with various valence states and corresponding compounds, and through multi-electron reaction they are capable to deliver high Na storage capacity. The rational construction of unique structures is verified to improve their Na storage properties. This perspective provides an overview of recent advances in layered vanadium oxide for SIBs, with a particular focus on construction of novel nanostructures, and mechanism studies via in situ characterization. Finally, we predict possible breakthroughs and future trends that lie ahead for high-performance layered vanadium oxides SIBs cathode.

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Reversible Lithium Storage at Highly Populated Vacant Sites in an Amorphous Vanadium Pentoxide Electrode

Cited by 142 publications

References 44 publications

Effects of high surface energy on lithium-ion intercalation properties of Ni-doped Li3VO4

Effects of high surface energy on lithium-ion intercalation properties of Ni-doped Li3VO4

Tailoring the shape of amorphous nanomaterials: recent developments and applications

Nanostructured layered vanadium oxide as cathode for high-performance sodium-ion batteries: a perspective

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