Heterolayered, One-Dimensional Nanobuilding Block Mat Batteries

Choi, Keun Ho; Cho, Sung Ju; Chun, Sang Jin; Yoo, Jong Tae; Lee, Chang Kee; Kim, Woong; Wu, Qinglin; Park, Sang Bum; Choi, Don Ha; Lee, Sun Young; Lee, Sang Young

doi:10.1021/nl5024029

Cited by 112 publications

(84 citation statements)

References 53 publications

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“…The surface structure of VMP cathode sheets was elucidated by X‐ray photoelectron spectroscopy (XPS) with focused monochromatized Al Kα radiation. The porosity of VMP cathode sheets was estimated by measuring its density difference before and after solvent (n‐butanol) uptake . The composition ratio of VMP cathode sheets was determined from thermogravimetric analysis (TGA) measurement (SDT Q600, TA Instruments) at a heating rate of 5 °C min −1 under air atmosphere.…”

Section: Methodsmentioning

confidence: 99%

Toward Ultrahigh‐Capacity V₂O₅ Lithium‐Ion Battery Cathodes via One‐Pot Synthetic Route from Precursors to Electrode Sheets

Lee

Kim

et al. 2016

Adv Materials Inter

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Acquisition of high‐energy density is the highest priority requirement and unending challenge in energy storage systems including lithium‐ion batteries (LIBs). One theoretically preferable way to reach this goal is the use of cathode active materials such as vanadium pentoxide (V2O5) that relies on multielectron insertion/extraction reactions. Application of V2O5 to LIB cathodes, however, has been mostly focused on V2O5 materials themselves with little emphasis on V2O5‐incorporated cathode sheets. Here, as an unusual electrode‐architecture approach to achieve ultrahigh‐capacity V2O5 cathode sheets, a new class of self‐standing V2O5 cathode sheets is demonstrated based on V2O5/multiwalled carbon tubes (MWNTs) mixtures spatially besieged by polyacrylonitrile nanofibers (referred to as “VMP cathode sheets”). Notably, the VMP cathode sheet is fabricated directly via one‐pot synthetic route starting from V2O5 precursor (i.e., through concurrent electrospraying/electrospinning followed by calcination), without metallic foil current collectors/carbon powders/polymeric binders. The one‐pot synthesis allows dense packing of V2O5 nanoparticles in close contact with MWNT electronic networks and also formation of well‐developed interstitial void channels (ensuring good electrolyte accessibility). This material/architecture uniqueness of the VMP cathode sheet eventually enables significant improvements in cell performance (particularly, gravimetric/volumetric capacity of cathode sheets) far beyond those accessible with conventional electrode technologies.

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Section: Methodsmentioning

confidence: 99%

Toward Ultrahigh‐Capacity V₂O₅ Lithium‐Ion Battery Cathodes via One‐Pot Synthetic Route from Precursors to Electrode Sheets

Lee

Kim

et al. 2016

Adv Materials Inter

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“…The CNF can be extracted from trees by a chemical pretreatment followed by a homogenization process, where after the CNF form a stable hydrogel dispersion with more than 98% water . Recently, CNF have been evaluated as a building block for nanopaper, flexible electronics, capacitors, magnetic paper, and batteries . However, the resulting structures have always been 1D, 2D or very simple 3D in case of foams.…”

Section: Introductionmentioning

confidence: 99%

Solidification of 3D Printed Nanofibril Hydrogels into Functional 3D Cellulose Structures

Håkansson

Henriksson

Vázquez

et al. 2016

Adv Materials Technologies

136

120

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1 of 9) 1600096 wileyonlinelibrary.com bio-based materials instead of fossil oil based plastics is key. A tremendous drawback of biomaterials such as biopolymers (cellulose, hemicelluloses, and lignin) from wood is that they do not melt, which is a huge obstacle also for the 3D printing process. Here, instead of a melt we used a hydrogel ink consisting of 2 wt% cellulose nanofi brils (CNF) and 98 wt% water to produce 3D structures with a 3D bioprinter. [ 4 ] Thereafter, the structures were dried and by controlling the solidifi cation process, the structure could either be kept intact or collapse in a controlled manner. We foresee a huge potential in using hydrogels and controlled collapse, as presented here, since it can increase the resolution of the print by 14 times after water evaporation. Increasing the resolution by modifying the ink, instead of making the printer head smaller, [ 6 ] could take the miniaturization of 3D printing to the next level.The CNF can be extracted from trees by a chemical pretreatment followed by a homogenization process, [ 7 ] where after the CNF form a stable hydrogel dispersion with more than 98% water. [ 8 ] Recently, CNF have been evaluated as a building block for nanopaper, [ 9 ] fl exible electronics, [10][11][12][13] capacitors, [ 14,15 ] magnetic paper, [ 16 ] and batteries. [17][18][19] However, the resulting structures have always been 1D, 2D or very simple 3D in case of foams. One of the big challenges with the CNF hydrogels is the difficulty to produce 3D shapes due to the lack of suitable processes and, not to be neglected, the collapse upon drying, resulting in 2D fi lms or 1D fi laments. [ 20 ] Other efforts, toward increasing the processability, have combined the CNF with thermoplastics to fabricate nanocomposites, [ 21,22 ] which indeed makes the composite processable but no longer a fully sustainable material.Working with CNF hydrogels enables the incorporation of functional components such as carbon nanotubes, [ 23,24 ] graphene, [ 15 ] polypyrrole, [ 25 ] or magnetic nanoparticles. [ 16 ] However, it is not until now that the 3D shapes and structures can be fully used, with the introduction of our 3D printing and drying methods. Furthermore, we demonstrate the use of the 3D bioprinting technology for biomaterials beyond the biomedical fi eld, which opens up a new door for the materials from plants to new applications such as functional packaging, textiles, health care products, and even furniture.In order for a fl uid (liquid, solution, melt, hydrogel, etc.) to be printable in a 3D printer, the fl uid needs to fl ow in the printer and have the ability to become solid like on a substrate after Cellulose nanofi brils isolated from trees have the potential to be used as raw material for future sustainable products within the areas of packaging, textiles, biomedical devices, and furniture. However, one unsolved problem has been to convert the nanofi bril-hydrogel into a dry 3D structure. In this study, 3D printing is used to convert a cellulose nanofi bril hydrogel ...

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“…The surface structure of the V 2 O 5 electrode sheet was elucidated by X-ray photoelectron spectroscopy (XPS) (ThermoFisher) with focused monochromatized Al Kα radiation. The porosity of the V 2 O 5 electrode sheets was estimated by measuring its density difference before and after solvent (n-butanol) uptake37.…”

Section: Methodsmentioning

confidence: 99%

Beyond Slurry-Cast Supercapacitor Electrodes: PAN/MWNT Heteromat-Mediated Ultrahigh Capacitance Electrode Sheets

Lee

Kim

et al. 2017

Sci Rep

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Supercapacitors (SCs) have garnered considerable attention as an appealing power source for forthcoming smart energy era. An ultimate challenge facing the SCs is the acquisition of higher energy density without impairing their other electrochemical properties. Herein, we demonstrate a new class of polyacrylonitrile (PAN)/multi-walled carbon tube (MWNT) heteromat-mediated ultrahigh capacitance electrode sheets as an unusual electrode architecture strategy to address the aforementioned issue. Vanadium pentoxide (V2O5) is chosen as a model electrode material to explore the feasibility of the suggested concept. The heteromat V2O5 electrode sheets are produced through one-pot fabrication based on concurrent electrospraying (for V2O5 precursor/MWNT) and electrospinning (for PAN nanofiber) followed by calcination, leading to compact packing of V2O5 materials in intimate contact with MWNTs and PAN nanofibers. As a consequence, the heteromat V2O5 electrode sheets offer three-dimensionally bicontinuous electron (arising from MWNT networks)/ion (from spatially reticulated interstitial voids to be filled with liquid electrolytes) conduction pathways, thereby facilitating redox reaction kinetics of V2O5 materials. In addition, elimination of heavy metallic foil current collectors, in combination with the dense packing of V2O5 materials, significantly increases (electrode sheet-based) specific capacitances far beyond those accessible with conventional slurry-cast electrodes.

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Heterolayered, One-Dimensional Nanobuilding Block Mat Batteries

Cited by 112 publications

References 53 publications

Toward Ultrahigh‐Capacity V₂O₅ Lithium‐Ion Battery Cathodes via One‐Pot Synthetic Route from Precursors to Electrode Sheets

Toward Ultrahigh‐Capacity V₂O₅ Lithium‐Ion Battery Cathodes via One‐Pot Synthetic Route from Precursors to Electrode Sheets

Solidification of 3D Printed Nanofibril Hydrogels into Functional 3D Cellulose Structures

Beyond Slurry-Cast Supercapacitor Electrodes: PAN/MWNT Heteromat-Mediated Ultrahigh Capacitance Electrode Sheets

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Heterolayered, One-Dimensional Nanobuilding Block Mat Batteries

Cited by 112 publications

References 53 publications

Toward Ultrahigh‐Capacity V2O5 Lithium‐Ion Battery Cathodes via One‐Pot Synthetic Route from Precursors to Electrode Sheets

Toward Ultrahigh‐Capacity V2O5 Lithium‐Ion Battery Cathodes via One‐Pot Synthetic Route from Precursors to Electrode Sheets

Solidification of 3D Printed Nanofibril Hydrogels into Functional 3D Cellulose Structures

Beyond Slurry-Cast Supercapacitor Electrodes: PAN/MWNT Heteromat-Mediated Ultrahigh Capacitance Electrode Sheets

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Product

Resources

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Toward Ultrahigh‐Capacity V₂O₅ Lithium‐Ion Battery Cathodes via One‐Pot Synthetic Route from Precursors to Electrode Sheets

Toward Ultrahigh‐Capacity V₂O₅ Lithium‐Ion Battery Cathodes via One‐Pot Synthetic Route from Precursors to Electrode Sheets