文章摘要
史高健,马沛宇,宋有信,鲍俊杰,黄毅萍,许戈文.高锂盐含量聚氨酯基固态电解质的制备与性能[J].精细化工,2019,36(4):
高锂盐含量聚氨酯基固态电解质的制备与性能
polyurethane with high lithium salt concentration as solid electrolyte for solid-sate lithium batteries
投稿时间:2018-08-01  修订日期:2018-12-10
DOI:
中文关键词: 聚合物电解质  锂电池  聚碳酸酯  聚氨酯  有机电化学与工业
英文关键词: polymer electrolyte  lithium battery  polycarbonate  polyurethane  electro-organic chemistry and industry
基金项目:1,安徽省自然科学基金项目(1808085QE173)2,安徽省高校科学研究项目(KJ2017A031)
作者单位E-mail
史高健 安徽大学化学化工学院 1660284956@qq.com 
马沛宇 安徽大学化学化工学院  
宋有信 安徽大学化学化工学院  
鲍俊杰 安徽大学化学化工学院  
黄毅萍 安徽大学化学化工学院  
许戈文 安徽大学化学化工学院 gwxu@ahu.edu.cn 
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中文摘要:
      以异佛尔酮二异氰酸酯、聚碳酸酯二元醇和一缩二乙二醇为原料,合成硬段质量分数为30%的聚碳酸酯型聚氨酯(PCPU),将合成的聚氨酯和双三氟甲烷磺酰亚胺锂(LiTFSI)复合制得不同锂盐质量分数的固态聚合物电解质(SPE)。通过红外光谱分析了聚氨酯结构,采用TG、DSC测试了聚氨酯及电解质的热学性能,并采用交流阻抗、线性扫描伏安测试探究了不同LiTFSI质量分数对电解质电化学性能的影响。结果表明,随着LiTFSI质量分数的增加,聚氨酯基固态聚合物电解质的室温离子电导率呈现先增大后减小再增大的趋势,当锂盐质量分数为70%时,室温离子电导率达到最大值(1.28×10-8 S/cm),以此固态电解质与LiFePO4正极组装的固态电池在60℃、0.2C电流密度时放电比容量为153 mA·h/g,循环100次容量保持率为84%。
英文摘要:
      Polycarbonate polyurethane (PCPU) with 30% hard segment was synthesized from isophoronediisocyanate, polycarbonate diol and diethylene glycol. Solid polymer electrolytes (SPE) with various concentration of lithium salts were prepared by the complexing of polyurethane and Lithium bistrifluoromethane sulfonyl imide(LiTFSI). The structure of polyurethane was analyzed by infrared spectroscopy. The thermal properties of polyurethane and electrolyte were tested by TG and DSC. The effects of different LiTFSI contents on the electrochemical properties of electrolyte were investigated by AC impedance and linear sweep voltammetry.The results indicated that the ionic conductivity of PU-based solid polymer electrolytes at room temperature increase with the increase of LiTFSI content then decrease and then increase. The ionic conductivity of the solid polymer electrolytes with 70% lithium salt concentration reached the maximum value among the as-prepared electrolytes, the all-solid-state battery using the PU-based electrolytes and LiFePO4 delivered the discharge capacity of 153 mA·h/g at 0.2C at 60°C, and the capacity retention reached 84% after 100 cycles.
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