MOF composite fibrous separators for high-rate lithium-ion batteries

Huang, Ding Hai; Liang, Cong; Chen, Lining; Tang, Mi; Zheng, Zijian; Wang, Zhengbang

doi:10.1007/s10853-020-05559-6

Cited by 31 publications

(17 citation statements)

References 43 publications

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“…We fitted the Nyquist plots with the equivalent circuit and obtained the charge transfer resistance ( R 2 ) and Warburg resistance ( W 2 , Table S3). The R 2 of the fresh cell (initial) with the polypropylene separator was 332Ω, which agreed with reported values. , The R 2 of the PCN separator was lower than the R 2 with the polypropylene separator, which suggested that the PCN layer improved the electrochemical reaction kinetics. , After polarization, we observed an increase in the R 2 of the cell with both separators, which indicated the decomposition of the Li-metal. , Another significant finding from the impedance spectra was the W 2 , which explained the formation of the solid electrolyte interface due to the decomposition of the solvent and TFSI anion on the Li surface. ,, For the cell with the PCN separator, the W 2 was much lower than the W 2 with the polypropylene separator (Figure B). One reason for this difference was that the PCN separator restricted the diffusion of the TFSI anion to the Li-metal.…”

Section: Resultssupporting

confidence: 88%

“…The R 2 of the fresh cell (initial) with the polypropylene separator was 332Ω, which agreed with reported values. 48,49 The R 2 of the PCN separator was lower than the R 2 with the polypropylene separator, which suggested that the PCN layer improved the electrochemical reaction kinetics. 49,50 After polarization, we observed an increase in the R 2 of the cell with both separators, which indicated the decomposition of the Li-metal.…”

Section: Resultsmentioning

confidence: 98%

“…48,49 The R 2 of the PCN separator was lower than the R 2 with the polypropylene separator, which suggested that the PCN layer improved the electrochemical reaction kinetics. 49,50 After polarization, we observed an increase in the R 2 of the cell with both separators, which indicated the decomposition of the Li-metal. 48,51 Another significant finding from the impedance spectra was the W 2 , which explained the formation of the solid electrolyte interface due to the decomposition of the solvent and TFSI anion on the Li surface.…”

Section: Resultsmentioning

confidence: 98%

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Metal–Organic Framework Separator as a Polyselenide Filter for High-Performance Lithium–Selenium Batteries

Hossain

Tulaphol

Thapa

et al. 2021

ACS Appl. Energy Mater.

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Rapid self-discharge, poor cycling stability, and low Coulombic efficiency from polyselenide shuttling have retarded practical applications of lithium−selenium batteries. Here, we show that a cation-selective PCN separator of PCN-250(Fe) metal− organic frameworks coated on a porous polypropylene membrane suppresses polyselenide shuttle and enhances lithium-ion transport in lithium−selenium batteries. The Lewis acid sites of this PCN separator acted as selective barriers that immobilized polyselenides and provided uniform and stable lithium nucleation and growth during cycling. Lithium−selenium cells with the PCN separator had a stable and reversible electrochemical performance with a high discharge capacity of 423 mAh/g at C/5 and a Coulombic efficiency of >98% for 500 cycles. This work provides a guide for developing high-performance lithium−selenium batteries by a cation-selective separator strategy. This PCN separator can be applied to alkali-metal and alkali-metal chalcogenide battery systems.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 98%

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Metal–Organic Framework Separator as a Polyselenide Filter for High-Performance Lithium–Selenium Batteries

Hossain

Tulaphol

Thapa

et al. 2021

ACS Appl. Energy Mater.

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“…Thermogravimetric (TG) analysis was conducted using a TGA apparatus (TGA8000). The porosity of the HTCNF-2 layer was tested by the n -butanol method − based on where m d and m w are the masses of the dry and wet (with n -butanol) HTCNF-2 samples, respectively. ρ b is the density of n -butanol and V is the volume of the dry HTCNF-2 sample.…”

Section: Methodsmentioning

confidence: 99%

Uniform Deposition and Effective Confinement of Lithium in Three-Dimensional Interconnected Microchannels for Stable Lithium Metal Anodes

Zhang

Jin

et al. 2021

ACS Appl. Mater. Interfaces

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Lithium dendrite formation has hindered the practical implementation of lithium metal batteries with higher energy densities compared with those of conventional lithium-ion batteries. Herein, a nanoconfinement strategy to access dendritefree lithium metal anodes comprising three-dimensional (3D) hollow porous multi-nanochannel carbon fiber embedded with TiO 2 nanocrystals (HTCNF) is reported. The transport of the lithium ions is facilitated by the 3D architecture. Functioning as nanoseeds, the TiO 2 nanocrystals guide the lithium ions toward forming uniform deposits, which are further confined inside the hollow carbon fibers and the 3D HTCNF layer. Site-selective deposition coupled with the nanoconfinement of lithium metal modifies the Li plating/stripping behavior and effectively suppresses the dendrite growth. The HTCNF-Li cell delivers a stable cycling performance of 1300 h with a voltage hysteresis as low as 6 mV. The assembled HTCNF-Li//LiFePO 4 full cell displays a compelling rate performance and enhanced cycling stability with high capacity retention (90% after 400 cycles at 0.5 C). Our results demonstrate a new and potentially scalable route to resolve the lithium dendrite growth issue for enhanced electrochemical performances, which can be further extended to other metal battery systems.

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“…[42] The inertness of MOFs also benefits the interfacial stability of GEs. [43] To name a few, HKUST-1, [42] Mg-MOF-74, [44] UiO-66, [45] and ZIF-8 [46] have been used as nanofillers to improve the ionic conductivity and Li + transference number. Despite the satisfactory ionic conductivity >1 mS cm −1 , these MOF-filled GEs exhibit moderate Li + transference numbers (≈0.6), meaning that more efforts are necessary to further improve the Li anode stability and then extend the battery lifespan.…”

Section: Introductionmentioning

confidence: 99%

MOF‐Enabled Ion‐Regulating Gel Electrolyte for Long‐Cycling Lithium Metal Batteries Under High Voltage

Hurlock

Ding

et al. 2021

Small

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possesses ultrahigh theoretical capacity (3860 mAh g −1 ), low bulk density (0.53 g cm −3 ), and the lowest negative potential (−3.04 V vs the standard hydrogen electrode). [3] These intriguing advantages make Li metal a promising candidate to be paired with various high-capacity cathodes to generate greater energy than LIBs. [4][5][6] Unfortunately, unveiling the Li anode technology, in reality, is faced with several persistent challenges. The most significant hurdles are the prevalent safety concern and short lifespan caused by the electro-chemo-mechanical instability of Li metal that drives the uncontrollable growth of Li dendrites in repeated cyclic processes. [7] The self-amplified Li dendrites may pierce the separator and cause thermal runaway, short-circuiting, or even explosion. [8,9] Meanwhile, the solid electrolyte interphase (SEI) layer can be broken by Li dendrites, causing continuous consumption of electrolytes/Li sources and eventually, inferior cycle performance. [10] Suppressing dendrite growth is a critical step before making the Li anode viable in the energy storage market. Extensive efforts have been made toward nanostructure design of Li anodes/current collectors, [11][12][13] or applying artificial SEI layers, [14,15] separator coatings, [16][17][18] solid/gel electrolytes, [19][20][21] electrolyte additives, [22,23] and so on. Among these modifications, solid electrolyte-enabled Li metal batteries (LMBs) are recognized as the ultimate choice because they eliminate the safety hazards resulting from leakage or explosion of organic liquid electrolytes; [24] the high mechanical modulus of solid electrolytes is also expected to alleviate the dendrite proliferation. [25] However, solid electrolytes are plagued by lower ionic conductivity and significantly greater interfacial resistance than liquid electrolytes. [26] Gel electrolytes (GEs) integrating the merits of relatively high ionic conductivity and good interfacial properties are regarded as a competent alternative to conquer the obstacles, and it is anticipated to soon broaden their applications practically. [27,28] For decades, a wide variety of GEs based on poly(vinylidene fluoride-co-hexafluoropropylene), [29,30] polyurethane, [31,32] polyacrylonitrile, [33,34] poly(ethylene oxide), [35,36] and more have been investigated to impart improved ionic conductivity at the order of magnitude close to liquid electrolytes (10 -3 S cm −1 ). However, GEs are less effective to suppress Li dendrites because of their insufficient modulus at the mega-Pascal High-voltage lithium metal batteries (LMBs) are a promising high-energydensity energy storage system. However, their practical implementations are impeded by short lifespan due to uncontrolled lithium dendrite growth, narrow electrochemical stability window, and safety concerns of liquid electrolytes. Here, a porous composite aerogel is reported as the gel electrolyte (GE) matrix, made of metal-organic framework (MOF)@bacterial cellulose (BC), to enable long-life LMBs under high voltage. The effective...

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MOF composite fibrous separators for high-rate lithium-ion batteries

Cited by 31 publications

References 43 publications

Metal–Organic Framework Separator as a Polyselenide Filter for High-Performance Lithium–Selenium Batteries

Metal–Organic Framework Separator as a Polyselenide Filter for High-Performance Lithium–Selenium Batteries

Uniform Deposition and Effective Confinement of Lithium in Three-Dimensional Interconnected Microchannels for Stable Lithium Metal Anodes

MOF‐Enabled Ion‐Regulating Gel Electrolyte for Long‐Cycling Lithium Metal Batteries Under High Voltage

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