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首页> 外文期刊>Applied Surface Science >Microporous gel electrolytes based on amphiphilic poly(vinylidene fluoride-co-hexafluoropropylene) for lithium batteries
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Microporous gel electrolytes based on amphiphilic poly(vinylidene fluoride-co-hexafluoropropylene) for lithium batteries

机译：基于两亲性聚偏二氟乙烯-共六氟丙烯的锂电池微孔凝胶电解质

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摘要

Poly(vinylidene fluoride-co-hexafluoropropylene) grafted poly(poly(ethylene glycol) methyl ether methacrylate) (PVDF-HFP-g-PPEGMA) is simply prepared by single-step synthesis directly via atom transfer radical polymerization (ATRP) of poly(ethylene glycol) methyl ether methacrylate (PEGMA) from poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP). Thermal, mechanical, swelling and electrochemical properties, as well as microstructures of the prepared polymer electrolytes, are evaluated and the effects of the various contents and average molecular weights of PEGMA on those properties are also been investigated. By phase inversion technique, the copolymer membranes tend to form well-defined microporous morphology with the increase of content and average molecular weight of PEGMA, due to the competition and cooperation between the hydrophilic PEGMA segments and hydrophobic PVDF-HFP. When these membranes are gelled with 1 M LiCF_3SO_3 in ethylene carbonate (EC)/propylene carbonate (PC) (1:1, v/v), their saturated electrolyte uptakes (up to 323.5%) and ion conductivities (up to 2.01 x 10 ~3 S cm~(-1)) are dramatically improved with respect to the pristine PVDF-HFP, ascribing to the strong affinity of the hydrophilic PEGMA segments with the electrolytes. All the polymer electrolytes are electrochemically stable up to 4.7 V versus Li/Li~+, and show good mechanical properties. Coin cells based on the polymer electrolytes show stable charge-discharge cycles and deliver discharge capacities to LiFePO_4 is up to 156 mAh g~(-1).
机译：聚偏二氟乙烯-六氟丙烯共聚物接枝的聚（聚乙二醇乙二醇甲基醚甲基丙烯酸酯）（PVDF-HFP-g-PPEGMA）可以通过一步一步合成直接通过聚（A）的原子转移自由基聚合（ATRP）制备聚（偏二氟乙烯-共六氟丙烯）（PVDF-HFP）的乙二醇）甲基丙烯酸甲酯（PEGMA）。评价了所制备的聚合物电解质的热，机械，溶胀和电化学性质以及微观结构，并且还研究了PEGMA的各种含量和平均分子量对那些性质的影响。通过相转化技术，由于亲水性PEGMA链段与疏水性PVDF-HFP之间的竞争与配合，共聚物膜倾向于随着PEGMA的含量和平均分子量的增加而形成明确的微孔形态。当这些膜在碳酸亚乙酯（EC）/碳酸亚丙酯（PC）（1：1，v / v）中用1 M LiCF_3SO_3凝胶化时，其饱和电解质吸收率（高达323.5％）和离子电导率（高达2.01 x 10）相对于原始的PVDF-HFP，〜3 S cm〜（-1））显着提高，这归因于亲水性PEGMA片段与电解质的强亲和力。与Li / Li〜+相比，所有聚合物电解质在高达4.7 V的电压下都是电化学稳定的，并显示出良好的机械性能。基于聚合物电解质的纽扣电池表现出稳定的充放电循环，并向LiFePO_4传递放电容量高达156 mAh g〜（-1）。

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  • 来源
    《Applied Surface Science》 |2012年第11期|p.4983-4989|共7页
  • 作者

    Shicheng Yu; Lie Chen; Yiwang Chen; Yongfen Tong;

  • 作者单位

    Institute of Polymers, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China;

    Institute of Polymers, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China,Jiangxi Provincial Key Laboratory of New Energy Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China;

    Institute of Polymers, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China,Jiangxi Provincial Key Laboratory of New Energy Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China;

    Institute of Polymers, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China,School of Environmental and Chemical Engineering, Nanchang Hongkong University, 696 Fenghe South Avenue, Nanchang 330063, China;

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  • 正文语种 eng
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  • 关键词

    polyelectrolytes; atom transfer radical polymerization; ionic conductivity;

    机译：聚电解质原子转移自由基聚合;离子电导率;

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