- Constructing stable ordered ion channels for a solid electrolyte membrane with high ionic conductivity by combining the advantages of liquid crystal and ionic liquid
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The advantages of solid-state polymer electrolytes (SPEs) such as ease of fabrication, high safety, good compatibility with Li metals make SPEs one of the most promising electrolyte materials for next generation high-performance and high-safety lithium-ion batteries (LIBs). However, the traditionally used PEO-based electrolytes usually exhibit very low ionic conductivity due to the high crystallinity of PEO, which impedes the commercialization of solid-state LIBs using PEO-based polymer electrolytes. In this study, an 'alternative' solid electrolyte material was prepared using a nematic liquid crystal (LC) and an ionic liquid (IL). Specifically, the LC with ordered layered nanostructures was polymerized and immobilized via UV-irradiation, while IL was sufficiently inserted into the ordered ion channels for fast transport ions. It should be noted that such a free-standing electrolyte film with stable ordered channels has been confirmed through the characterizations of DSC, POM, SEM and XRD. As a result, the solid electrolyte film shows superior comprehensive electrochemical performance in terms of a very high room temperature ionic conductivity (2.14 × 10-2 S cm-1), wide electrochemical window (4.8 V), and very good compatibility with lithium metal. Furthermore, the LiFePO4/Li cell using the ordered electrolyte film shows an average discharge capacity of 150 mA h g-1. Undoubtedly, our study provides a new solid electrolyte material that has the potential to be used in the next generation of high safety and high energy density LIBs.
- Wang, Shi,Zeng, Qinghui,Wang, Ailian,Liu, Xu,Chen, Jie,Wang, Zhinan,Zhang, Liaoyun
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- Broadband reflection of polymer-stabilized chiral nematic liquid crystals induced by a chiral azobenzene compound
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A chiral nematic liquid crystal-photopolymerizable monomer-chiral azobenzene compound composite was prepared and then polymerized under UV irradiation. The reflection wavelength of the composite can be extended to cover the 1000-2400 nm range and also be adjusted to the visible light region by controlling the concentration of chiral compounds.
- Chen, Xingwu,Wang, Ling,Chen, Yinjie,Li, Chenyue,Hou, Guoyan,Liu, Xin,Zhang, Xiaoguang,He, Wanli,Yang, Huai
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p. 691 - 694
(2014/01/06)
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- POLYMERIZABLE COMPOUND AND COMPOSITION CONTAINING THE POLYMERIZABLE COMPOUND
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The polymerizable compound of the present invention is represented by general formula (1) below and can provide a composition that is polymerizable near ambient temperature and exists in a liquid crystal phase at low temperatures. The composition and a (co)polymer of the polymerizable compound of the present invention are liquid crystal substances useful as optically anisotropic materials. (In the formula, each of rings A1 to A3 represents a benzene ring, cyclohexane ring, etc.; each of X to Z represents a C1-8 alkyl or alkoxy group, C2-6 alkenyl group, halogen atom, cyano group, or CH2=CR3-COO-; each of R1 to R3 represents a hydrogen atom, methyl group, or halogen atom; each of L1 to L3 represents -CH2CH2COO-, -COO-, -OCO-, -CH2CH2-, -O(CH2)f- (herein, f = 1-8), etc.; n represents 0 or 1; and a to c represent such numbers that the polymerizable compound has at least one or more of any of X, Y, and Z.)
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Page/Page column 37-38
(2010/11/28)
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