High-performance gel electrolytes with tetra-armed polymer network for Li ion batteries

Hazama, T.; Fujii, Kenta; Sakai, Takamasa; Aoki, Masahiro; Mimura, Hideyuki; Eguchi, Hisao; Todorov, Yanko; Yoshimoto, Nobuko; Morita, Masayuki

doi:10.1016/j.jpowsour.2015.04.011

Cited by 44 publications

(24 citation statements)

References 14 publications

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“…Recently, high‐toughness ion gels with low‐polymer and high‐ionic liquid (IL) contents have been extensively explored and applied as gel electrolytes for Li ion batteries and gas separation membranes . For example, Lodge et al prepared a chemically cross‐linked ABA‐type triblock copolymer and demonstrated high ionic conductivity and high CO 2 selective permeability .…”

Section: Resultsmentioning

confidence: 91%

Exploration of Ideal Polymer Networks

Shibayama

2017

Macromolecular Symposia

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Summary The history of exploration of ideal polymer networks is reviewed, followed by a demonstration of fabrication and applications of novel polymer networks free from defects/entanglements. The networks, we call, are Tetra‐PEG gels, consisting of two types of tetra‐arm poly(ethylene glycol) (PEG) prepolymers that have mutually reactive amine (Tetra‐PEG‐NH2) and activated ester (Tetra‐PEG‐NHS) terminal groups, respectively. Here NHS represents N‐hydroxysuccinimide. The novelty lies in “cross‐end‐coupling” of symmetrical tetra‐arm PEGs having complementary end groups. Small‐angle neutron scattering (SANS) results on Tetra‐PEG gels, together with mechanical properties and swelling behaviors, strongly suggest that thus prepared Tetra‐PEG gels are near‐“ideal” polymer networks with very small fractions of defects. In order to answer the reasons why such a structure could be formed, the kinetics of gelation was investigated by IR, UV, and time‐resolved rheological and SANS measurements. Furthermore, fabrication of Tetra‐PEG ion gels, having good mechanical properties, is demonstrated.

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Section: Resultsmentioning

confidence: 91%

Exploration of Ideal Polymer Networks

Shibayama

2017

Macromolecular Symposia

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“…Hazama et al [84] prepared IL gel through tetra-poly (ethylene glycol) (PEG) network with the polymer content of about 5-6 wt%, which was the lowest among the GEs for LIBs. In the LIB system, the tetra-PEG network contained 1.0 mol L −1 LiPF 6 in a binary or ternary system, i.e., EC/DEC and EC/DEC/TFEP (EC: ethylene carbonate, DEC: diethyl carbonate, and TFEP: tris(2,2,2-trifluoroeth-yl) phosphate (Fig.…”

Section: Ionogelmentioning

confidence: 99%

Safety regulation of gel electrolytes in electrochemical energy storage devices

2019

Sci. China Mater.

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Electrochemical energy storage devices, such as lithium ion batteries (LIBs), supercapacitors and fuel cells, have been vigorously developed and widely researched in past decades. However, their safety issues have appealed immense attention. Gel electrolytes (GEs), with a special state in-between liquid and solid electrolytes, are considered as the most promising candidates in electrochemical energy storage because of their high safety and stability. This review summarized the recent progresses made in the application of GEs in the safety regulation of the electrochemical energy storage devices. Special attention was paid to the gel polymer electrolytes, the organic low molecule-mass GEs, as well as the fumed silica-based and siloxane-based GEs. Finally, the current challenges and future directions were proposed in terms of the development of GEs.

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“…However, the high interfacial resistance between ISEs and electrodes caused by their rigid nature still impedes their application. PSEs alleviate drawbacks of ISEs as they possess high flexibility and good interfacial compatibility ( Hazama et al, 2015 ; Cui et al, 2017 ; Jiang et al, 2018 ). The gel polymer electrolytes (GPEs), one type of the PSEs, have been a research hotpot, such as poly (ethylene oxide) (PEO) ( Wu et al, 2018 ), poly (acrylonitrile) (PAN) ( Zhou et al, 2015 ), poly (methyl methacrylate) (PMMA) ( Liu et al, 2016 ), and poly (vinylidenefluoride-hexafluoropropylene) (PVDF-HFP) ( Deng et al, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

A Three-Dimensional Electrospun Li6.4La3Zr1.4Ta0.6O12–Poly (Vinylidene Fluoride-Hexafluoropropylene) Gel Polymer Electrolyte for Rechargeable Solid-State Lithium Ion Batteries

et al. 2021

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Developing high-quality solid-state electrolytes is important for producing next-generation safe and stable solid-state lithium-ion batteries. Herein, a three-dimensional highly porous polymer electrolyte based on poly (vinylidenefluoride-hexafluoropropylene) (PVDF-HFP) with Li6.4La3Zr1.4Ta0.6O12 (LLZTO) nanoparticle fillers (PVDF-HFP-LLZTO) is prepared using the electrospinning technique. The PVDF-HFP-LLZTO gel polymer electrolyte possesses a high ionic conductivity of 9.44 × 10–4 S cm−1 and a Li-ion transference number of 0.66, which can be ascribed that the 3D hierarchical nanostructure with abundant porosity promotes the liquid electrolyte uptake and wetting, and LLZTO nanoparticles fillers decrease the crystallinity of PVDF-HFP. Thus, the solid-state lithium battery with LiFePO4 cathode, PVDF-HFP-LLZTO electrolyte, and Li metal anode exhibits enhanced electrochemical performance with improved cycling stability.

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High-performance gel electrolytes with tetra-armed polymer network for Li ion batteries

Cited by 44 publications

References 14 publications

Exploration of Ideal Polymer Networks

Exploration of Ideal Polymer Networks

Safety regulation of gel electrolytes in electrochemical energy storage devices

A Three-Dimensional Electrospun Li6.4La3Zr1.4Ta0.6O12–Poly (Vinylidene Fluoride-Hexafluoropropylene) Gel Polymer Electrolyte for Rechargeable Solid-State Lithium Ion Batteries

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