A non-toxic and bio-active natural polymer electrolyte iota-carrageenan (i-carrageenan) with LiClO 4 has been prepared by conventional solution casting technique. Succinonitrile (SN) plastic crystal has been used as an additive to optimize the conductivity of i-carrageenan biopolymer electrolytes. The obtained biopolymer electrolytes are characterized by X-ray diffraction, Fourier-transform infrared, differential scanning calorimetry and AC impedance studies. The highest ionic conductivity at room temperature is 3.57 × 10 −4 S cm −1 for the film composition of 1.0 g i-carrageenan/0.5 wt% LiClO 4 . The inclusion of 0.3 wt% of SN into this polymeric system has improved the value of ionic conductivity to 3.33 × 10 −3 S cm −1 at ambient temperature, and the activation energy is found to be very low for this concentration. Transference number analysis also reveals that the cause of conductivity is primarily due to ions with the highest ionic transference number of 0.92 (Wagner’s method) and cationic transference number of 0.58 (Bruce and Vincent method) for the highest conducting plasticized sample. Transport parameters of diffusion coefficients and mobility of cations and anions are also in tune with the conductivity results. Linear sweep voltammetry shows that the highest conducting sample is electrochemically stable up to 2.36 V without SN, and it is 3.1 V with SN addition. These results recommend the suitability of the fabricated polymer electrolyte for lithium ion battery system.

中文翻译：

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高氯酸锂和丁二腈（增塑剂）iota-卡拉胶生物聚合物电解质的合成与表征

已通过常规溶液浇铸技术制备了具有 LiClO 4 的无毒且具有生物活性的天然聚合物电解质 iota-卡拉胶（i-卡拉胶）。琥珀腈 (SN) 塑料晶体已用作添加剂以优化 i-卡拉胶生物聚合物电解质的电导率。获得的生物聚合物电解质的特征在于 X 射线衍射、傅里叶变换红外、差示扫描量热法和交流阻抗研究。对于1.0 g i-角叉菜胶/0.5 wt% LiClO 4 的膜组合物，室温下的最高离子电导率为3.57×10 -4 S cm -1 。将 0.3 wt% 的 SN 包含在该聚合物体系中已将环境温度下的离子电导率值提高到 3.33 × 10 -3 S cm -1 ，并且发现该浓度的活化能非常低。迁移数分析还表明，导电率的原因主要是由于最高离子迁移数为 0.92（Wagner 方法）和最高导电增塑样品的阳离子迁移数为 0.58（布鲁斯和文森特方法）的离子。阳离子和阴离子的扩散系数和迁移率的传输参数也与电导率结果一致。线性扫描伏安法表明，最高导电样品在没有 SN 的情况下电化学稳定高达 2.36 V，而在添加 SN 时为 3.1 V。这些结果表明所制备的聚合物电解质适用于锂离子电池系统。58（布鲁斯和文森特方法）用于最高导电增塑样品。阳离子和阴离子的扩散系数和迁移率的传输参数也与电导率结果一致。线性扫描伏安法表明，最高导电样品在没有 SN 的情况下电化学稳定高达 2.36 V，而在添加 SN 时为 3.1 V。这些结果表明所制备的聚合物电解质适用于锂离子电池系统。58（布鲁斯和文森特方法）用于最高导电增塑样品。阳离子和阴离子的扩散系数和迁移率的传输参数也与电导率结果一致。线性扫描伏安法表明，最高导电样品在没有 SN 的情况下电化学稳定高达 2.36 V，而在添加 SN 时为 3.1 V。这些结果表明所制备的聚合物电解质适用于锂离子电池系统。