A bioactive and non-toxic biopolymer-based electrolyte has gained attention in recent research for their potential applications in the fabrication of electrochemical devices. In this work, we extracted the chitosan successfully prepared from shrimp shells using Brine’s method. The solid polymer electrolyte comprising the blend of chitosan and agar–agar, plasticised with polyethylene glycol (PEG), as host polymer and lithium perchlorate (LiClO 4 ) as a dopant is prepared by solution casting technique. Also, the effect of different weight percentage of the plasticiser PEG at a fixed ratio of perchlorate content is investigated. The obtained chitosan blended film is highly suitable as a electrolyte for electrochemical devices. The prepared polymer electrolyte is characterised using attenuated total reflection–Fourier transform infrared spectroscopy (ATR–FTIR), high-resolution scanning electron microscopy (HR–SEM), X-ray diffraction (XRD) and electrochemical impedance spectroscopy. The ATR–FTIR spectroscopy confirms the presence of particular functional groups present in chitosan and complex formation between blended polymers and lithium perchlorate. The surface morphology and amorphous crystallinity of chitosan and blended polymer electrolytes revealed from HR–SEM and XRD analysis. The ionic conductivity of the prepared materials is studied using AC impedance spectroscopy and compared. The highest ionic conductivity at room temperature obtained for the sample is 4.56 × 10 −4 Scm −1 (CAP 3 ). The mechanical properties of films have been studied using a Universal testing machine analysis. Wagner’s polarisation measurements have estimated the Li + transport numbers of SPEs. Linear sweep voltammetry was performed on half-cell method to study the electrochemical stability window of the maximum ionic conductivity of SPEs.

中文翻译：

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虾壳（斑节对虾）壳聚糖与壳聚糖基混合固体聚合物锂离子电池电解质的制备及表征

基于生物活性和无毒生物聚合物的电解质因其在电化学装置制造中的潜在应用而在最近的研究中受到关注。在这项工作中，我们使用盐水的方法从虾壳中提取成功制备的壳聚糖。固体聚合物电解质包括壳聚糖和琼脂的混合物，用聚乙二醇 (PEG) 增塑作为主体聚合物和高氯酸锂 (LiClO 4 ) 作为掺杂剂，通过溶液浇铸技术制备。此外，研究了在高氯酸盐含量固定比例下不同重量百分比的增塑剂 PEG 的影响。所得壳聚糖共混膜非常适合作为电化学装置的电解质。使用衰减全反射-傅里叶变换红外光谱（ATR-FTIR）、高分辨率扫描电子显微镜（HR-SEM）、X射线衍射（XRD）和电化学阻抗谱对制备的聚合物电解质进行表征。ATR-FTIR 光谱证实了壳聚糖中存在特定的官能团以及混合聚合物和高氯酸锂之间的复合物形成。HR-SEM和XRD分析揭示了壳聚糖和混合聚合物电解质的表面形貌和无定形结晶度。使用交流阻抗谱研究并比较所制备材料的离子电导率。样品在室温下获得的最高离子电导率为 4.56 × 10 -4 Scm -1 (CAP 3 )。已使用万能试验机分析研究了薄膜的机械性能。Wagner 的极化测量估计了 SPE 的 Li + 传输数。采用半电池法进行线性扫描伏安法研究SPEs最大离子电导率的电化学稳定性窗口。