Synthesis and characterization of biopolymer electrolyte based on tamarind seed polysaccharide, lithium perchlorate and ethylene carbonate for electrochemical applications
Synthesis and characterization of biopolymer electrolyte based on tamarind seed polysaccharide, lithium perchlorate and ethylene carbonate for electrochemical applications
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基于罗望子籽多糖、高氯酸锂和碳酸乙烯酯的电化学应用生物聚合物电解质的合成和表征
DOI：
10.1007/s11581-019-02857-1
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发表时间：
2019
期刊：
影响因子：
2.8
通讯作者：
M. Muthukrishnan
中科院分区：
文献类型：
--
作者：
L. Sampathkumar;P. Christopher Selvin;S. Selvasekarapandian;P. Perumal;R. Chitra;M. Muthukrishnan
以罗望子多糖(TSP)为主体聚合物，不同浓度的高氯酸锂(LiClO4)为离子掺杂盐，不同质量分数的碳酸乙烯(EC)为增塑剂，采用溶液浇铸法制备了环保型、低成本的固体生物聚合物电解质。用X射线衍射仪和傅立叶变换红外光谱分别证实了盐的无定形性质和盐与聚合物基质的络合作用。用DSC分析测定了聚合物电解质的玻璃化转变温度(Tg)的变化。在室温下，当聚合物电解质组成为1 g TSP/0.45 g LiClO4时，离子电导率达到最大值8.77 × 10−4S·cm−1，而在上述聚合物电解质组成中加入0.3wt%EC增塑剂后，离子电导率提高了1个数量级(1.06 × 10−3S·cm−1)。对于电导率最高的EC增塑剂加入聚合物电解质，其活化能(Ea)较低。用Wagner直流极化法估算的离子迁移数表明，导电物种主要是Li+离子。用LSV法测定了电导率最高的生物聚合物电解质的电化学稳定窗口。从所构建的电池来看，TSP-LiClO4和TSP-LiClO4-EC聚合物电解液体系的开路电池电位分别为1.6和1.9 nV。并与商用锂电池的性能进行了比较。
Eco-friendly and cost-effective solid biopolymer electrolytes based on tamarind seed polysaccharide (TSP) as host polymer with different concentrations of lithium perchlorate (LiClO4) as ionic dopant salt and different wt% of ethylene carbonate (EC) as plasticizer have been synthesized via solution casting technique. The amorphous nature and complexation of the salt with the polymer matrix have been confirmed by XRD and FTIR analysis, respectively. The change in glass transition temperature (Tg) of the polymer electrolyte has been measured using DSC analysis. Maximum ionic conductivity of 8.77 × 10−4S cm−1is obtained for the polymer electrolyte composition of 1 g TSP/0.45 g LiClO4at ambient temperature, whereas the ionic conductivity improved to 1 order of magnitude (1.06 × 10−3S cm−1) through the incorporation of 0.3 wt% EC plasticizer into the above polymer electrolyte composition determined by AC impedance analysis. The activation energy (Ea) is observed to be low for the highest conducting EC plasticizer incorporated polymer electrolyte. The value of ionic transference number estimated by Wagner’s dc polarization method reveals that the conducting species are predominantly Li+ions. The electrochemical stability window of the highest conducting biopolymer electrolytes has been determined by LSV. From the constructed battery, the open circuit cell potentials of 1.6 and 1.9 V have been observed for the TSP-LiClO4and TSP-LiClO4-EC polymer electrolyte systems, respectively. The performance of the constructed battery has been compared with the commercially available lithium battery.