Extension of size of monodisperse silica nanospheres and their well-ordered assembly

Watanabe, Ryota; Yokoi, Toshiyuki; Kobayashi, Erina; Otsuka, Yuki; Shimojima, Atsushi; Okubo, Tatsuya; Tatsumi, Takashi

doi:10.1016/j.jcis.2010.09.001

Cited by 123 publications

(103 citation statements)

References 34 publications

(38 reference statements)

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“…19,20 The mesopores in the fabricated carbon replica were observed by field emission scanning electron microscopy (FE-SEM; Hitachi S-5200) with an accelerating voltage of 30 kV.…”

Section: Methodsmentioning

confidence: 99%

Synthesis, Structure, and Electrochemical Properties of a Sulfur-Carbon Replica Composite Electrode for All-Solid-State Li-Sulfur Batteries

Suzuki

Tateishi

Nagao

et al. 2016

J. Electrochem. Soc.

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Carbon replica constructed of three-dimensional, ordered mesopores was employed as the conductive framework for the composite electrode in Li-sulfur all-solid-state batteries. Using a gas-phase mixing method under various conditions, elemental sulfur was introduced into the mesopores with an average diameter of 12 nm. The all-solid-state cells consisted of the sulfur-carbon replica composite cathode, thio-LISICON solid electrolyte, and Li-Al alloy anode. The cells produced discharge capacities of approximately 1500 mAh g −1 in the 1 st cycle, which is comparable to the theoretical capacity of sulfur. Thermogravimetric and X-ray diffraction analyses revealed that sulfur deposited inside the mesopores is the main contributor to the excellent performance of the battery. However, sulfur strongly interacted with the carbon replica, reducing the thickness of the carbon wall from 7 to 4 nm. This structural change in the carbon matrix triggered the deterioration of battery performance, especially the cycling capability. Optimizing the sulfur deposition conditions could therefore enhance the performance of batteries using such composite electrodes. The all-solid-state Li-sulfur battery is a promising candidate for next-generation energy storage systems due to its large theoretical capacity (1672 mAh g −1 ), the abundance and low toxicity of sulfur, and the non-flammable nature of solid electrolytes. [1][2][3][4][5][6] In addition, the solid electrolyte prevents the dissolution of lithium polysulfides Li 2 S n (3 ≤ n < 8) into the electrolyte during charge-discharge reactions, which is a serious issue for liquid-type Li-sulfur batteries. 7,8 However, the low electrical conductivity of sulfur (5 × 10 −30 S cm −1 ) 9 lowers its utilization ratio, thus deteriorating the rates and cycle capabilities of these batteries. To overcome such problems, carbon materials have been employed as the framework for sulfur composite electrodes, because their superior electrical conductivities can enhance the charge-discharge characteristics of Li-sulfur batteries. 1,2,4,10 In particular, the large volume changes of sulfur itself during battery reaction also hamper reversible charge-discharge.11,12 Therefore, mesoporous carbon materials containing highly ordered mesopores within their matrix are widely used for this purpose, and are expected to be suitable candidates for the preparation of composite sulfur-carbon electrodes.2-4,13 These mesoporous carbon materials have unique characteristics such as large surface area (e.g. CMK-3: ∼2000 m 2 g -1 )10 and large amount of mesopores in the structure. The mesopores accommodate more sulfur and suppress the sulfur volume change in the composite. Although CMK-3 with ordered two-dimensional mesopores (∼2 nm) is an attractive carbon matrix candidate, its cylindrical pores do not facilitate contact between the sulfur within and the solid electrolyte, 2,3 while both ionic and electronic conduction pathways are necessary for the electrode to function. Therefore, a novel composite electrode design could i...

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“…19,20 The mesopores in the fabricated carbon replica were observed by field emission scanning electron microscopy (FE-SEM; Hitachi S-5200) with an accelerating voltage of 30 kV.…”

Section: Methodsmentioning

confidence: 99%

Synthesis, Structure, and Electrochemical Properties of a Sulfur-Carbon Replica Composite Electrode for All-Solid-State Li-Sulfur Batteries

Suzuki

Tateishi

Nagao

et al. 2016

J. Electrochem. Soc.

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“…43) Hierarchically porous platinum with small and large mesopores were obtained by the reduction of H 2 PtCl 6 in the dualtemplate, followed by the template removal using hydrofluoric acid. The silica nanoparticles were synthesized by the hydrolysis of tetraethoxysilane (TEOS) in water in the presence of L-lysine as a catalyst according to the literature by Yokoi et al 44), 45) This method provides monodispersed colloidal silica whose size is ca. 12 nm and larger.…”

Section: Dual-templating Methods Using Colloidal Templatesmentioning

confidence: 99%

Effective use of flexible low-dimensional colloidal particles and colloidal crystals for the control of hierarchically porous materials

Kuroda

2015

J. Ceram. Soc. Japan

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Hierarchically porous materials are useful materials because characteristics of pores in various length scales (e.g., micro-, meso-, and macropores) can synergistically be integrated in a material. In this review, preparation of hierarchically porous materials by templating methods is summarized from the viewpoint of flexibilities of colloidal particles and colloidal assemblies as building blocks and templates, respectively. Low-dimensional colloidal particles, such as nanosheets and nanotubes, are used as flexible building blocks to form three-dimensional networks on templates with few defects. Because such colloidal particles can have interand intraparticle pores, their assembly on templates is effective to form pores in various length scales. Colloidal crystals, assemblies of uniform colloidal particles, have been used as templates of macroporous and hierarchically porous materials. Recently, the use of colloidal crystals as flexible templates is reported and attracts much attention. A stress due to confined growth of gold within the interstices of the colloidal crystals causes their structural changes, retaining their periodic structure, which direct one-or two-dimensional growth of gold. It is regarded as a novel concept for the preparation of hierarchical nanostructured materials with high crystallinity. The utilization of flexibilities of colloidal particles and colloidal assemblies is promising for the creation of hierarchically porous materials with unique nanostructures.

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“…12 In this method, the size of silica nanospheres can be tuned from 8 to 550 nm by employing the seed regrowth method. 13 Interestingly, the arrangement of silica nanospheres into a cubic closed packed (ccp) structure is achieved simply by solvent evaporation. The thus-formed colloidal array of silica nanospheres has three-dimensional, interparticle voids with high size uniformity.…”

Section: Rotaxanesmentioning

confidence: 99%

Silica Nanospheres Functionalized by Ferrocene-containing [2]Rotaxane

Yu¹,

Suzaki²,

Maekawa³

et al. 2014

Chemistry Letters

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Extension of size of monodisperse silica nanospheres and their well-ordered assembly

Cited by 123 publications

References 34 publications

Synthesis, Structure, and Electrochemical Properties of a Sulfur-Carbon Replica Composite Electrode for All-Solid-State Li-Sulfur Batteries

Synthesis, Structure, and Electrochemical Properties of a Sulfur-Carbon Replica Composite Electrode for All-Solid-State Li-Sulfur Batteries

Effective use of flexible low-dimensional colloidal particles and colloidal crystals for the control of hierarchically porous materials

Silica Nanospheres Functionalized by Ferrocene-containing [2]Rotaxane

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