ZnF2 coated three dimensional Li-Ni composite anode for improved performance

Jia, Weishang; Wang, Ying; Qu, Siji; Yao, Zeyu; Liu, Yu-Chi; Li, Chao; Wang, Zhihong; Li, Jingze

doi:10.1016/j.jmat.2019.02.008

Cited by 23 publications

(11 citation statements)

References 37 publications

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“…32) 25,63 , which is comparable to that of Li + diffusion across the typical SEI formed in LiPF 6 /EC/EMC (51 kJ mol ‒1 ) 25 . Furthermore, several metal fluorides ( M x F y , M = Li, Zn, Cu, and Al) have been well acknowledged as main rigid-frame materials for protecting metal anodes, since they can guide the metal nucleation and effectively inhibit the growth of dendrites 64–66 . Meanwhile, the S/N-rich organic compounds could provide sufficient ion channels for Zn 2+ transport, and their flexibility will accommodate volume changes caused by Zn plating/stripping 67,68 .…”

Section: Resultsmentioning

confidence: 99%

Zinc anode-compatible in-situ solid electrolyte interphase via cation solvation modulation

et al. 2019

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The surface chemistry of solid electrolyte interphase is one of the critical factors that govern the cycling life of rechargeable batteries. However, this chemistry is less explored for zinc anodes, owing to their relatively high redox potential and limited choices in electrolyte. Here, we report the observation of a zinc fluoride-rich organic/inorganic hybrid solid electrolyte interphase on zinc anode, based on an acetamide-Zn(TFSI)2 eutectic electrolyte. A combination of experimental and modeling investigations reveals that the presence of anion-complexing zinc species with markedly lowered decomposition energies contributes to the in situ formation of an interphase. The as-protected anode enables reversible (~100% Coulombic efficiency) and dendrite-free zinc plating/stripping even at high areal capacities (>2.5 mAh cm‒2), endowed by the fast ion migration coupled with high mechanical strength of the protective interphase. With this interphasial design the assembled zinc batteries exhibit excellent cycling stability with negligible capacity loss at both low and high rates.

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Section: Resultsmentioning

confidence: 99%

Zinc anode-compatible in-situ solid electrolyte interphase via cation solvation modulation

et al. 2019

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“…1 e). First, only Mg and F were found at a depth of 10 nm with a constant atomic ratio of 1:2, indicating the presence of MgF 2 [ 38 ]. Below the pure MgF 2 region, the atomic concentrations of both Mg and F began to decrease gradually from a depth of 15 nm while the concentration of Zn increased, indicating the maximum diffusion length of the Zn nanoparticles into the MgF 2 matrix from the Zn metal substrate during the RF sputtering process.…”

Section: Resultsmentioning

confidence: 99%

Stable Zn Metal Anodes with Limited Zn-Doping in MgF2 Interphase for Fast and Uniformly Ionic Flux

et al. 2022

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The practical applications of aqueous Zn metal batteries are currently restricted by the inherent drawbacks of Zn such as the hydrogen evolution reaction, sluggish kinetics, and dendrite formation. To address these problems, herein, a limitedly Zn-doped MgF2 interphase comprising an upper region of pure, porous MgF2 and a lower region of gradient Zn-doped MgF2 is achieved via radio frequency sputtering technique. The porous MgF2 region is a polar insulator whose high corrosion resistance facilitates the de-solvation of the solvated Zn ions and suppression of hydrogen evolution, resulting in Zn metal electrodes with a low interfacial resistance. The Zn-doped MgF2 region facilitates fast transfer kinetics and homogeneous deposition of Zn ions owing to the interfacial polarization between the Zn dopant and MgF2 matrix, and the high concentration of the Zn dopant on the surface of the metal substrate as fine nuclei. Consequently, a symmetric cell incorporating the proposed Zn metal exhibits low overpotentials of ~ 27.2 and ~ 99.7 mV without Zn dendrites over 250 to 8000 cycles at current densities of 1.0 and 10.0 mA cm−2, respectively. The developed Zn/MnO2 full cell exhibits superior capacity retentions of 97.5% and 84.0% with average Coulombic efficiencies of 99.96% after 1000 and 3000 cycles, respectively.

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“…Meanwhile, the parameters of ZnO-based polymer nanocomposites are strongly affected by various factors such as the filler concentration, size distribution, and degree of dispersion . The ZnO multifunctionality is important for various applications, including catalysts, , photovoltaics, , sensors, − transistors, − TENGs, , and batteries. − In terms of battery applications, ZnO is a high-performance material for reversible electrochemical Li storage. , It exhibits a higher theoretical capacity (978 mAh g –1 ) than that of graphite (372 mAh g –1 ), which is commonly used as an anode material for lithium-ion batteries (LIBs). − However, due to the low electrical conductivity and large volume change of ZnO active materials, they demonstrate a low reversible capacity, poor kinetic properties, and serious capacity fading even at low current densities. , Although numerous efforts (mainly focused on the ZnO particle morphology, aspect ratio, size, and orientation) have been made to overcome these shortcomings, researchers were unable to effectively reduce volume variations and increase the electrical conductivity of ZnO materials. Thus, next-generation ZnO-based anode materials for LIBs must be free from the aforementioned drawbacks.…”

Section: Introductionmentioning

confidence: 99%

“…23−26 However, due to the low electrical conductivity and large volume change of ZnO active materials, they demonstrate a low reversible capacity, poor kinetic properties, and serious capacity fading even at low current densities. 23,27 Although numerous efforts (mainly focused on the ZnO particle morphology, 28 aspect ratio, 29 size, 30 and orientation 31 ) have been made to overcome these shortcomings, researchers were unable to effectively reduce volume variations and increase the electrical conductivity of ZnO materials. Thus, next-generation ZnO-based anode materials for LIBs must be free from the aforementioned drawbacks.…”

Section: Introductionmentioning

confidence: 99%

ZnO–Plasma Polymer Fluorocarbon Thin Films for Stable Battery Anodes and High-Output Triboelectric Nanogenerators

Song

Kim

Yong

et al. 2022

ACS Appl. Nano Mater.

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In this study, ZnO−plasma polymer fluorocarbon (PPFC) nanocomposite thin films were prepared by a mid-range frequency sputtering method using ZnO−polyfluoroethylene−carbon nanotube hybrid targets, and their optical, physical, and surface properties were investigated as functions of the ZnO concentration in the targets. The obtained films exhibited excellent visible light transmittance and hydrophobic characteristics, while their surface roughness and refractive index increased with increasing the ZnO concentration from 6.52 to 15.3 nm and from 1.45 to 1.55, respectively, due to the larger number of ZnO-related absorption states. In addition, the structures and compositions of the films were determined by X-ray diffraction (XRD), grazing incidence small-angle X-ray scattering (GISAXS), and X-ray photoelectron spectroscopy (XPS). It was found that mixed ZnO nanoparticles were well embedded into the PPFC matrix. Finally, we examined the potential applicability of the fabricated ZnO−PPFC nanocomposite thin films in various fields, such as batteries and triboelectric nanogenerators (TENGs). The TENG output voltage increased by approximately 15.8% from 28.05 V for commercial polytetrafluoroethylene (PTFE)-based generators to 32.48 V for the ZnO−PPFC nanocomposite film-based TENG. Furthermore, the ZnO−PPFC nanocomposite thin film demonstrated a stable performance as a battery anode material. While the output of a ZnO reference electrode decreased by approximately 74.5% after 100 cycles, the output of a ZnO−PPFC anode decreased by only 12.4% and remained stable afterward.

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ZnF2 coated three dimensional Li-Ni composite anode for improved performance

Cited by 23 publications

References 37 publications

Zinc anode-compatible in-situ solid electrolyte interphase via cation solvation modulation

Zinc anode-compatible in-situ solid electrolyte interphase via cation solvation modulation

Stable Zn Metal Anodes with Limited Zn-Doping in MgF2 Interphase for Fast and Uniformly Ionic Flux

ZnO–Plasma Polymer Fluorocarbon Thin Films for Stable Battery Anodes and High-Output Triboelectric Nanogenerators

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