Two-dimensional vanadyl phosphate ultrathin nanosheets for high energy density and flexible pseudocapacitors

Wu, Changzheng; Lu, Xiuli; Peng, Lele; Xu, Ke; Xu, Peng; Huang, Jianliu; Yu, Guihua; Xie, Yi

doi:10.1038/ncomms3431

Cited by 379 publications

(269 citation statements)

References 43 publications

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“…A hydrophilic polymer polyvinyl alcohol (PVA), which has been widely used as a matrix in solid-state supercapacitors (35,36), was introduced into the WiBS electrolyte to form a hydrogel (SI Appendix, Fig. S14 A and B).…”

Section: Resultsmentioning

confidence: 99%

Unique aqueous Li-ion/sulfur chemistry with high energy density and reversibility

Yang

Suo

Borodin

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

165

182

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Leveraging the most recent success in expanding the electrochemical stability window of aqueous electrolytes, in this work we create a unique Li-ion/sulfur chemistry of both high energy density and safety. We show that in the superconcentrated aqueous electrolyte, lithiation of sulfur experiences phase change from a highorder polysulfide to low-order polysulfides through solid-liquid two-phase reaction pathway, where the liquid polysulfide phase in the sulfide electrode is thermodynamically phase-separated from the superconcentrated aqueous electrolyte. The sulfur with solid-liquid two-phase exhibits a reversible capacity of 1,327 mAh/(g of S), along with fast reaction kinetics and negligible polysulfide dissolution. By coupling a sulfur anode with different Li-ion cathode materials, the aqueous Li-ion/sulfur full cell delivers record-high energy densities up to 200 Wh/(kg of total electrode mass) for >1,000 cycles at ∼100% coulombic efficiency. These performances already approach that of commercial lithium-ion batteries (LIBs) using a nonaqueous electrolyte, along with intrinsic safety not possessed by the latter. The excellent performance of this aqueous battery chemistry significantly promotes the practical possibility of aqueous LIBs in large-format applications.water-in-salt | rechargeable aqueous battery | aqueous sulfur battery | gel polymer electrolyte | phase separation I n the past two decades, rechargeable lithium-ion batteries (LIBs) have revolutionized consumer electronics with their high energy density and excellent cycling stability, and are the state-of-the-art candidates for applications ranging from kilowatt hours for electric vehicles up to megawatt hours for grids (1, 2). The latter applications in large-format present much more stringent requirements for safety, cost, and environmental friendliness, besides energy density and cycle life. The shortcomings of LIB are mostly due to the flammable and toxic nonaqueous electrolytes and moderate energy densities (<400 Wh·kg −1 ) provided by the electrochemical couples currently used (3). Among the various "beyond Li-ion" high-energy chemistries (>500 Wh·kg −1 ) explored currently, the nonaqueous lithium/sulfur (Li/S) battery based on sulfur as a cathode (theoretical capacity of 1,675 mAh·g −1 ) and metallic lithium as an anode seems to be the most practical, as evidenced by the mushrooming literature and significant advances in this system in the past 5 y (4-7). However, commercialization of this system still faces challenges because of severe safety concerns associated with the dendrite growth of metallic Li anode in highly inflammable ether-based electrolytes (8), and the high self-discharge associated with parasitic shuttling of the intermediate polysulfide species. Moreover, the moisture-sensitive nature of the nonaqueous electrolyte would contribute significantly to the cost of the Li/S battery pack due to the stringent moisture-exclusion infrastructure required during the manufacturing, processing, and packaging of the cells. The indispensabl...

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Section: Resultsmentioning

confidence: 99%

Unique aqueous Li-ion/sulfur chemistry with high energy density and reversibility

Yang

Suo

Borodin

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

165

182

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“…One promising strategy to improve the energy density is to design nanostructured electrode materials with large surface areas and good structural stability. Various nanostructures including nanoparticles, 8 nanowires, 9,10 nanotubes 11 and nanosheets 12,13 have been explored as SC electrodes and have exhibited improved electrochemical performance. Among these nanostructures, three-dimensional (3D) porous nanoarchitectures have been demonstrated to be a promising candidate for SCs as these nanoarchitectures can offer large interfacial areas, reduced ionic diffusion distances and facilitate charge separation and transport.…”

Section: Introductionmentioning

confidence: 99%

Scalable self-growth of Ni@NiO core-shell electrode with ultrahigh capacitance and super-long cyclic stability for supercapacitors

et al. 2014

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Three-dimensional (3D) electrodes have been demonstrated to be promising candidates for high-performance supercapacitors because of their unique architectures and outstanding electrochemical properties. However, the fabrication process for current 3D electrodes is not scalable. Herein, a novel and cost-effective activation process has been developed to macroscopically produce 3D porous Ni@NiO core-shell electrodes with enhanced electrochemical properties. The porous Ni@NiO core-shell electrode obtained by activated commercial Ni foam (NF) in a 3 M HCl solution yields an ultrahigh areal capacitance of 2.0 F cm À2 at a high current density of 8 mA cm À2 , which is substantially higher than that of most reported 3D NF-based electrodes. Moreover, the activated NF (ANF) electrode exhibited super-long cycling stability. Owing to the increased accessible surface area and continual formation of electrochemically active NiO during cycling, the areal capacitance of the ANF electrode did not exhibit any decay and instead increased from 0.47 to 1.27 F cm À2 after 100 000 cycles at 100 mV s À1 . This is the best cycling stability achieved by a 3D NF-based electrode. Additionally, a high-performance asymmetrical supercapacitor (ASC) device based on the as-prepared ANF cathode and a reduced graphene oxide (RGO) anode was also prepared. The ANF//RGO-ASC device was able to deliver a maximum energy density of 1.06 mWh cm À3 and a maximum power density of 0.42 W cm À3 .

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“…After proper chemical reduction, the GO membrane can then be converted into rGO membrane. 7,18 Due to its simplicity, low-cost, and easiness to scale up, the vacuum filtration based graphene membrane fabrication has seen many applications in recent years, such as water desalination and purification, 12,15,16,19,20 energy storage, 14,17 and oil-water separation. 19 In a vacuum filtration system, commercial membrane filters are generally used as filtration medium.…”

Section: Introductionmentioning

confidence: 99%

Are vacuum-filtrated reduced graphene oxide membranes symmetric?

Tang

Zhang

et al. 2016

Nanoscale

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Two-dimensional vanadyl phosphate ultrathin nanosheets for high energy density and flexible pseudocapacitors

Cited by 379 publications

References 43 publications

Unique aqueous Li-ion/sulfur chemistry with high energy density and reversibility

Unique aqueous Li-ion/sulfur chemistry with high energy density and reversibility

Scalable self-growth of Ni@NiO core-shell electrode with ultrahigh capacitance and super-long cyclic stability for supercapacitors

Are vacuum-filtrated reduced graphene oxide membranes symmetric?

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