One-step preparation of poly(ionic liquid)-based flexible electrolytes by in-situ polymerization for dendrite-free lithium ion batteries

Huang, Teng; Long, Man-Cheng; Wang, Xiuli; Wu, Gang; Wang, Yu‐Zhong

doi:10.1016/j.cej.2019.122062

Cited by 52 publications

(15 citation statements)

References 59 publications

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“…The t + of SCEs (5%S-10%U) is 0.72 (Fig. 6(b)), the value is higher than the SCEs (10%S-5%U, 10%U and 15%U) and others [36,45,[47][48][49], as shown in Fig. 6(c).…”

Section: Resultsmentioning

confidence: 82%

Anion-immobilized solid composite electrolytes based on metal-organic frameworks and superacid ZrO2 fillers for high-performance all solid-state lithium metal batteries

Wei

Zhang

et al. 2021

Int J Miner Metall Mater

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Anion-immobilized solid composite electrolytes (SCEs) are important to restrain the propagation of lithium dendrites for all solidstate lithium metal batteries (ASSLMBs). Herein, a novel SCEs based on metal-organic frameworks (MOFs, UiO-66-NH 2 ) and superacid ZrO 2 (S-ZrO 2 ) fillers are proposed, and the samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), thermo-gravimetric analyzer (TGA) and some other electrochemical measurements. The -NH 2 groups of UiO-66-NH 2 combines with F atoms of poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) chains by hydrogen bonds, leading to a high electrochemical stability window of 5 V. Owing to the incorporation of UiO-66-NH 2 and S-ZrO 2 in PVDF-HFP polymer, the open metal sites of MOFs and acid surfaces of S-ZrO 2 can immobilize anions by strong Lewis acid-base interaction, which enhances the effect of immobilization anions, achieving a high Li-ion transference number (t + ) of 0.72, and acquiring a high ionic conductivity of 1.05×10 -4 S•cm -1 at 60°C. The symmetrical Li/Li cells with the anion-immobilized SCEs may steadily operate for over 600 h at 0.05 mA•cm -2 without the shortcircuit occurring. Besides, the solid composite Li/LiFePO 4 (LFP) cell with the anion-immobilized SCEs shows a superior discharge specific capacity of 158 mAh•g -1 at 0.2 C. The results illustrate that the anion-immobilized SCEs are one of the most promising choices to optimize the performances of ASSLMBs.

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“…The t + of SCEs (5%S-10%U) is 0.72 (Fig. 6(b)), the value is higher than the SCEs (10%S-5%U, 10%U and 15%U) and others [36,45,[47][48][49], as shown in Fig. 6(c).…”

Section: Resultsmentioning

confidence: 82%

Anion-immobilized solid composite electrolytes based on metal-organic frameworks and superacid ZrO2 fillers for high-performance all solid-state lithium metal batteries

Wei

Zhang

et al. 2021

Int J Miner Metall Mater

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“…The ETPTA cross-linked network and random PVDF-HFP chains can constitute a semi-interpenetrating network skeleton, in which PVDF-HFP chains play a role in regulating the flexibility of the skeleton. [9,16] After UV-curing, the derived SNP membrane is self-standing, bendable, smooth and translucent (Figure 1c). Flexible SNP electrolyte contributes to improve solid-solid contact between electrolyte and electrodes, and reduce interface resistance.…”

Section: Resultsmentioning

confidence: 99%

Ultraviolet‐Cured Semi‐Interpenetrating Network Polymer Electrolytes for High‐Performance Quasi‐Solid‐State Lithium Metal Batteries

Xie

et al. 2021

Chemistry A European J

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Solid polymer electrolytes with relatively low ionic conductivity at room temperature and poor mechanical strength greatly restrict their practical applications. Herein, we design semi‐interpenetrating network polymer (SNP) electrolyte composed of an ultraviolet‐crosslinked polymer network (ethoxylated trimethylolpropane triacrylate), linear polymer chains (polyvinylidene fluoride‐co‐hexafluoropropylene) and lithium salt solution to satisfy the demand of high ionic conductivity, good mechanical flexibility, and electrochemical stability for lithium metal batteries. The semi‐interpenetrating network has a pivotal effect in improving chain relaxation, facilitating the local segmental motion of polymer chains and reducing the polymer crystallinity. Thanks to these advantages, the SNP electrolyte shows a high ionic conductivity (1.12 mS cm−1 at 30 °C), wide electrochemical stability window (4.6 V vs. Li+/Li), good bendability and shape versatility. The promoted ion transport combined with suppressed impedance growth during cycling contribute to good cell performance. The assembled quasi‐solid‐state lithium metal batteries (LiFePO4/SNP/Li) exhibit good cycling stability and rate capability at room temperature.

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“…Another class of imidazole-based polymers belongs to poly(ionic liquid)s (PILs), that is macromolecules with ionic liquid (IL) moieties. Due to the challenging tasks of the synthesis, revealing the structure–property relationships, and the broad range of special application possibilities, PILs have been intensively investigated in recent years (see e.g., references [ 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 ] and references therein). PILs may find applications in energy production as proton [ 57 ], electron [ 58 , 59 ], or Li-ion [ 60 , 73 ] conducting materials; as metal free [ 61 ] and metal containing [ 62 ] catalysts; gas separation membranes [ 63 , 64 ]; DNA isolation microspheres [ 65 ] etc.…”

Section: Introductionmentioning

confidence: 99%

“…The crosslinking usually takes place by copolymerizing IL monomers with conventional crosslinking agents, such as divinylbenzene and ethylene glycol dimethacrylate [ 43 , 69 , 70 , 71 ] or by bis-vinylimidazolium compounds [ 72 , 73 ]. In a few cases, low molecular weight poly(ethylene glycol) (PEG) di(meth)acrylate oligomers were used as crosslinkers in the preparation of PIL networks [ 41 , 74 , 75 , 76 , 77 , 78 , 79 ]. Although these crosslinked PILs can be considered as PIL conetworks with the PEG oligomer crosslinkers, the conetwork aspects have not been investigated so far, most likely because of the relatively low PEG contents in these materials.…”

Section: Introductionmentioning

confidence: 99%

Nanoconfined Crosslinked Poly(ionic liquid)s with Unprecedented Selective Swelling Properties Obtained by Alkylation in Nanophase-Separated Poly(1-vinylimidazole)-l-poly(tetrahydrofuran) Conetworks

et al. 2020

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Despite the great interest in nanoconfined materials nowadays, nanocompartmentalized poly(ionic liquid)s (PILs) have been rarely investigated so far. Herein, we report on the successful alkylation of poly(1-vinylimidazole) with methyl iodide in bicontinuous nanophasic poly(1-vinylimidazole)-l-poly(tetrahydrofuran) (PVIm-l-PTHF) amphiphilic conetworks (APCNs) to obtain nanoconfined methylated PVImMe-l-PTHF poly(ionic liquid) conetworks (PIL-CNs). A high extent of alkylation (~95%) was achieved via a simple alkylation process with MeI at room temperature. This does not destroy the bicontinuous nanophasic morphology as proved by SAXS and AFM, and PIL-CNs with 15–20 nm d-spacing and poly(3-methyl-1-vinylimidazolium iodide) PIL nanophases with average domain sizes of 8.2–8.4 nm are formed. Unexpectedly, while the swelling capacity of the PIL-CN dramatically increases in aprotic polar solvents, such as DMF, NMP, and DMSO, reaching higher than 1000% superabsorbent swelling degrees, the equilibrium swelling degrees decrease in even highly polar protic (hydrophilic) solvents, like water and methanol. An unprecedented Gaussian-type relationship was found between the ratios of the swelling degrees versus the polarity index, indicating increased swelling for the nanoconfined PVImMe-l-PTHF PIL-CNs in solvents with a polarity index between ~6 and 9.5. In addition to the nanoconfined structural features, the unique selective superabsorbent swelling behavior of the PIL-CNs can also be utilized in various application fields.

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One-step preparation of poly(ionic liquid)-based flexible electrolytes by in-situ polymerization for dendrite-free lithium ion batteries

Cited by 52 publications

References 59 publications

Anion-immobilized solid composite electrolytes based on metal-organic frameworks and superacid ZrO2 fillers for high-performance all solid-state lithium metal batteries

Anion-immobilized solid composite electrolytes based on metal-organic frameworks and superacid ZrO2 fillers for high-performance all solid-state lithium metal batteries

Ultraviolet‐Cured Semi‐Interpenetrating Network Polymer Electrolytes for High‐Performance Quasi‐Solid‐State Lithium Metal Batteries

Nanoconfined Crosslinked Poly(ionic liquid)s with Unprecedented Selective Swelling Properties Obtained by Alkylation in Nanophase-Separated Poly(1-vinylimidazole)-l-poly(tetrahydrofuran) Conetworks

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