Poly(vinylidene difluoride) coating on Cu current collector for high-performance Na metal anode

Hou, Zhen; Wang, Wenhui; Yu, Yikang; Zhao, Xixia; Chen, Qianwen; Zhao, Lincheng; Di, Qian; Ju, Huanxin; Quan, Zewei

doi:10.1016/j.ensm.2019.06.026

Cited by 58 publications

(33 citation statements)

References 51 publications

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“…21 , 22 ). Remarkably, such a long cycle life of Na anodes (~2000 h at 1 mA cm −2 and 1 mAh cm −2 , ~1700 h at 5 mA cm −2 and 5 mAh cm −2 , and ~1400 h at 10 mA cm −2 and 10 mAh cm −2 ) is better than those of other Na anodes stabilized by various methods under similar test conditions, such as 3D MXene-melamine foam (720 h at 10 mA cm −2 and 10 mAh cm −2 ) 46 , poly(vinylidene difluoride)-coated Cu current collector (1200 h at 1 mA cm −2 and 1 mAh cm −2 ) 47 , and Na@rGO anodes (300 h at 5 mA cm −2 and 5 mAh cm −2 ) 24 , as shown as in Fig. 5b and Supplementary Table 3 21 , 44 , 48 – 50 , 54 , 55 .…”

Section: Resultsmentioning

confidence: 88%

Achieving stable Na metal cycling via polydopamine/multilayer graphene coating of a polypropylene separator

et al. 2021

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Sodium metal batteries are considered one of the most promising low-cost high-energy-density electrochemical energy storage systems. However, the growth of unfavourable Na metal deposition and the limited cell cycle life hamper the application of this battery system at a large scale. Here, we propose the use of polypropylene separator coated with a composite material comprising polydopamine and multilayer graphene to tackle these issues. The oxygen- and nitrogen- containing moieties as well as the nano- and meso- porous network of the coating allow cycling of Na metal electrodes in symmetric cell configuration for over 2000 h with a stable 4 mV overpotential at 1 mA cm−2. When tested in full Na || Na3V2(PO4)3 coin cell, the coated separator enables the delivery of a stable capacity of about 100 mAh g−1 for 500 cycles (90% capacity retention) at a specific current of 235 mA g−1 and satisfactory rate capability performances (i.e., 75 mAh g−1 at 3.5 A g−1).

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Section: Resultsmentioning

confidence: 88%

Achieving stable Na metal cycling via polydopamine/multilayer graphene coating of a polypropylene separator

et al. 2021

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“…16, 17). Remarkably, such an ultralong cycle life of Na anodes (~ 2000 h at 1 mA cm − 2 and 1 mAh cm − 2 , ~ 1700 h at 5 mA cm − 2 and 5 mAh cm − 2 , ~ 1400 h at 10 mA cm − 2 and 10 mAh cm − 2 ) is superior to those of other Na anodes stabilized by various methods under similar test conditions, such as 3D MXene-melamine foam (720 h at 10 mA cm − 2 and 10 mAh cm − 2 ) 43 , poly(vinylidene di uoride) coated Cu current collector (1200 h at 1 mA cm − 2 and 1 mAh cm − 2 ) 44 , and Na@reduced GO anodes (300 h at 5 mA cm − 2 and 5 mAh cm − 2 ) 24 , as shown as in Supplementary Fig. 18 and Supplementary Fig.…”

Section: Resultsmentioning

confidence: 88%

Definable Two-Dimensional Mesoporous Polydopamine-Graphene Heterostructure as Multi-Functional Ion Redistributor for Ultrastable Sodium Metal Anodes

Qin

Huang

et al. 2020

Preprint

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Sodium metal batteries are widely acknowledged as one of the most promising low-cost high-energy-density batteries, but limited by uncontrollable dendritic growth and short cyclability. Herein, two-dimensional (2D) mesoporous polydopamine-graphene (mPG) heterostructures with definable pore size and sheet thickness are demonstrated as multi-functional ion redistributors to realize ultrastable, dendrite-free Na metal anodes. Benefitting from abundant sodiophilic groups (-OH, C=O and -NH-), 2D nanoporous graphene, and ordered mesoporous ion channels in mPG, the Na metal anodes show high Coulombic efficiency of >99.5%, outstanding cyclability of ~2000 h, and unprecedented rate performance of 25 mA cm-2 with 25 mAh cm-2, outperforming all the reported Na anodes stabilized by diversified strategies. What’s more, the mPG based Na/Na3V2(PO4)3 full batteries deliver exceptionally enhanced cyclability (90% retention rate after 500 cycles) and rate capacity (75 mAh g-1 at 30 C), demonstrative of impressive potential of well-designed 2D mesoporous polymers for precisely regulating Na deposition.

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“…[24] Moreover,itshould be noted that PVDF,which is widely used as an effective protective layer in Li and Na metal battery,cannot improve the electrochemical performance of bare Cu. [38][39][40][41] ThePVDF@Cu current collector experiences as hort circuit after % 50 hc ycles,w hich is even worse than bare Cu and far worse than that of PVA- of Kp lating and after 100 cycles;b )pristine PVA-Borax@Cu, PVA-Borax@Cua fter 4mAh cm À2 of Kp lating and PVA-Borax@Cua fter 100 cycles, energy dispersive spectroscopy mapping of PVA-Borax@Cu after 100 cycles. The electrode samples after 100 hcycling for SEM analysis are performed with 10 %DOD test, which were first plated for 5mAh cm À2 of Kat0.5 mA cm À2 ,then cycled with acurrent density of 0.5 mA cm À2 for 0.5 mAh cm À2 of Ki nthe subsequent cycles.…”

Section: Methodsmentioning

confidence: 99%

Towards Dendrite‐Free Potassium‐Metal Batteries: Rational Design of a Multifunctional 3D Polyvinyl Alcohol‐Borax Layer

et al. 2021

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Km etal is the optimal anode for K-ion batteries because of its high capacity and lowoperating potential, but it suffers from fast capacity fading and safety issues due to an unstable solid electrolyte interphase (SEI) and continuous Kdendrite growth. Herein, to obtain promising potassium-metal batteries,a3D polyvinyl-alcohol (PVA)-borax layer is designed, which enables ad endrite-free K-plating/stripping process.T he protective layer possesses good wettability,h igh K-ion diffusivity,a nd good structural stability,w hich enables a" uniform and underneath plating" behavior,t herefore exhibiting as table electrochemical performance.A saresult, Cu current collector with PVA-borax (PVA-borax@Cu) exhibits as table cycling lifetime for 700 ha t0 .5 mA cm À2 and 500 hat1mA cm À2 at 10 %depth of discharge (DOD) without dendrite formation. Even at ah igh utilization of 25 %D OD and 50 %D OD,t he PVA-borax@Cu shows as table cycle for 180 hand 100 h, respectively.

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Poly(vinylidene difluoride) coating on Cu current collector for high-performance Na metal anode

Cited by 58 publications

References 51 publications

Achieving stable Na metal cycling via polydopamine/multilayer graphene coating of a polypropylene separator

Achieving stable Na metal cycling via polydopamine/multilayer graphene coating of a polypropylene separator

Definable Two-Dimensional Mesoporous Polydopamine-Graphene Heterostructure as Multi-Functional Ion Redistributor for Ultrastable Sodium Metal Anodes

Towards Dendrite‐Free Potassium‐Metal Batteries: Rational Design of a Multifunctional 3D Polyvinyl Alcohol‐Borax Layer

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