Block Copolymer Directed Ordered Mesostructured TiNb<sub>2</sub>O<sub>7</sub> Multimetallic Oxide Constructed of Nanocrystals as High Power Li-Ion Battery Anodes

Jo, Changshin; Kim, Young‐Sik; Hwang, Jongkook; Shim, Joongpyo; Chun, Jinyoung; Lee, Jinwoo

doi:10.1021/cm501011d

Cited by 153 publications

(131 citation statements)

References 57 publications

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“…Similar findings have been demonstrated in anode materials 111 ; for example, titanium-based mesoporous materials have shown superior performance compared with their bulk counterparts, because their meso structure ensures a large contact area between the electro lyte and the electrode, and a short diffusion distance for Li + insertion [112][113][114] . Moreover, the electrochemical performance of conversion reaction-based anodes (for example, M x O y + 2yLi + + 2ye − → xM + yLi 2 O (M = transition metal)) can also be improved by mesostructuring, which can effectively alleviate the structural stress during lithiation and delithiation 115 (FIG.…”

Section: Lithium-ion Batteriessupporting

confidence: 67%

Mesoporous materials for energy conversion and storage devices

2016

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At present, more than 80% of the energy consumed globally is derived from non-renewable fossil fuels such as coal, oil and natural gas. The combustion of these fuels inevitably leads to the emission of CO 2 -a main driver of climate change and other serious environmental effects, including the emission of other dangerous gases. Although mitigating climate change is a multifaceted challenge, one of the pillars of any future low-carbon economy will be a substantially increased dependence on renewable and environmentally friendly energy sources and storage systems. Tremendous progress is being made in developing advanced technologies to meet these challenges. However, to enable the cost-effective, large-scale production of these technologies, further improvement of performance and efficiency is needed. Although unique challenges exist for each technology, the development of functional materials is crucial.Porous solids -in particular, mesoporous solids -are appealing materials in many energy applications owing to their ability to absorb and interact with guest species (including, but not limited to, lithium ions, hydrogen atoms and sulfur molecules) on their outer and inner surfaces, and in the pore spaces 1,2 . According to the International Union of Pure and Applied Chemistry (IUPAC) definition, porous materials are classified into three categories according to their pore sizes: micro porous (<2 nm), mesoporous (2-50 nm) or macro porous (>50 nm). Since the first report of mesoporous silica in the 1990s 3,4 , the variety of mesoporous materials available has rapidly expanded, encompassing a very broad range of compositions.Mesoporous materials have exceptional properties, including ultrahigh surface areas, large pore volumes, tunable pore sizes and shapes, and also exhibit nanoscale effects in their mesochannels and on their pore walls. These features are particularly advantageous for applications in energy conversion and storage [5][6][7][8][9][10] . In principle, high surface areas should provide a large number of reaction or interaction sites for surface or interface-related processes such as adsorption, separation, catalysis and energy storage; however, a high surface area does not necessarily translate to an improved performance in applications. Large pore volumes have shown promise in the loading of guest species and in the accommodation of the expansion and strain relaxation during repeated electrochemical energy storage processes. Uniform and tunable mesopore channels facilitate the transport of atoms, ions and large molecules through the bulk of the material, thereby increasing the number of active sites with high accessibility and overcoming the size restriction encountered with microporous materials. In addition, there are fascinating nanoconfinement effects in the voids of uniform mesochannels, which are advantageous in catalysis and energy storage. 3D nanometre-sized frameworks can produce extraordinary nanoscale effects (that is, surface and quantum effects) that result in mesoporous materials with u...

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Section: Lithium-ion Batteriessupporting

confidence: 67%

Mesoporous materials for energy conversion and storage devices

2016

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“…Block copolymer templating is a well-established method to synthesize a variety of ordered mesoporous oxides with uniform, well-defi ned pore sizes, [51][52][53][54][55][56][57][58] in both thin fi lm [ 59,60 ] and powder formats. [61][62][63] This preliminary step of creating MoO 2 enables precise control of the nanoscale architecture, however, block copolymer templating cannot be used to directly form sulfi des. Therefore, we use thermal sulfurization in H 2 S to convert the MoO 2 to MoS 2 , which preserves the carefully constructed nanoscale architecture.…”

Section: Introductionmentioning

confidence: 99%

Mesoporous MoS₂ as a Transition Metal Dichalcogenide Exhibiting Pseudocapacitive Li and Na‐Ion Charge Storage

Cook

Kim

Yan

et al. 2016

Advanced Energy Materials

409

272

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The ion insertion properties of MoS2 continue to be of widespread interest for energy storage. While much of the current work on MoS2 has been focused on the high capacity four‐electron reduction reaction, this process is prone to poor reversibility. Traditional ion intercalation reactions are highlighted and it is demonstrated that ordered mesoporous thin films of MoS2 can be utilized as a pseudocapacitive energy storage material with a specific capacity of 173 mAh g−1 for Li‐ions and 118 mAh g−1 for Na‐ions at 1 mV s−1. Utilizing synchrotron grazing incidence X‐ray diffraction techniques, fast electrochemical kinetics are correlated with the ordered porous structure and with an iso‐oriented crystal structure. When Li‐ions are utilized, the material can be charged and discharged in 20 seconds while still achieving a specific capacity of 140 mAh g−1. Moreover, the nanoscale architecture of mesoporous MoS2 retains this level of lithium capacity for 10 000 cycles. A detailed electrochemical kinetic analysis indicates that energy storage for both ions in MoS2 is due to a pseudocapacitive mechanism.

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“…For the precise synthesis of TiNb 2 O 7 , a stoichiometric molar ratio of TiO 2 and Nb 2 O 5 (1:1) was mixed thoroughly in a mortar. The mixture was then placed in an alumina crucible and heated in an electric furnace at various temperatures (800,1000,1200, and 1400°C) and for various holding durations (1,10,15, and 20 h). A heating rate of 8°C/min was used for the synthesis.…”

Section: Methodsmentioning

confidence: 99%

“…TiNb 2 O 7 (TiO 2 ·Nb 2 O 5 ) is regarded as one of the most promising alternative materials available for use in lithium ion batteries (LIBs) [1,2], solid oxide fuel cells (SOFCs) [3], electrochromic devices [4], and ceramic-based solid state humidity sensors [5]. TiNb 2 O 7 can be synthesized by a variety of processes such as solid state synthesis [6], laser-induced pyrolysis [7], hydrothermal crystallization [8], and evaporation-induced self-assembly (EISA) [1].…”

Section: Introductionmentioning

confidence: 99%

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Reaction Kinetics and Morphological Study of TiNb2O7 Synthesized by Solid-State Reaction

Choi¹,

Ali²,

Choi³

et al. 2017

Archives of Metallurgy and Materials

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Although TiNb 2 O 7 is regarded as a material with high application potential in lithium-ion batteries (LIBs) and solid-oxide fuel cells (SOFCs), it has been difficult to find suitable cost-effective conditions for synthesizing it on a commercial scale. In this study, TiNb 2 O 7 compounds were synthesized by a solid state synthesis process. For stoichiometrically precise synthesis of the TiNb 2 O 7 phase, the starting materials, TiO 2 and Nb 2 O 5 were taken in a 1:1 molar ratio. Activation energy and reaction kinetics of the system were investigated at various synthesis temperatures (800,1000,1200, and 1400°C) and for various holding durations (1,5,10, and 20 h). Furthermore, change in the product morphology and particle size distribution were also evaluated as a function of synthesis temperature and duration. Additionally, quantitative phase analysis was conducted using the Rietveld refinement method. It was found that increases in the synthesis temperature and holding time lead to increase in the mean particle size from 1 to 4.5 μm. The reaction rate constant for the synthesis reaction was also calculated.

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Block Copolymer Directed Ordered Mesostructured TiNb₂O₇ Multimetallic Oxide Constructed of Nanocrystals as High Power Li-Ion Battery Anodes

Cited by 153 publications

References 57 publications

Mesoporous materials for energy conversion and storage devices

Mesoporous materials for energy conversion and storage devices

Mesoporous MoS₂ as a Transition Metal Dichalcogenide Exhibiting Pseudocapacitive Li and Na‐Ion Charge Storage

Reaction Kinetics and Morphological Study of TiNb2O7 Synthesized by Solid-State Reaction

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Block Copolymer Directed Ordered Mesostructured TiNb2O7 Multimetallic Oxide Constructed of Nanocrystals as High Power Li-Ion Battery Anodes

Cited by 153 publications

References 57 publications

Mesoporous materials for energy conversion and storage devices

Mesoporous materials for energy conversion and storage devices

Mesoporous MoS2 as a Transition Metal Dichalcogenide Exhibiting Pseudocapacitive Li and Na‐Ion Charge Storage

Reaction Kinetics and Morphological Study of TiNb2O7 Synthesized by Solid-State Reaction

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Block Copolymer Directed Ordered Mesostructured TiNb₂O₇ Multimetallic Oxide Constructed of Nanocrystals as High Power Li-Ion Battery Anodes

Mesoporous MoS₂ as a Transition Metal Dichalcogenide Exhibiting Pseudocapacitive Li and Na‐Ion Charge Storage