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第 36 卷第 4 期 精 细 化 工 Vol.36, No.4
201 9 年 4 月 FINE CHEMICALS Apr. 2019

有机电化学与工业
高锂盐含量聚氨酯基固态电解质的制备与性能

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史高健，马沛宇，宋有信，鲍俊杰，黄毅萍，许戈文
（安徽大学 化学化工学院 安徽省绿色高分子重点实验室，安徽 合肥 230601）

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
–8
盐质量分数为 70%时，制备的电解质离子电导率达到最大值（1.28×10 S/cm），以此固态电解质与 LiFePO 4 正
极组装的固态电池在 60 ℃、0.2 C 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%。
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
中图分类号：TQ317 文献标识码：A 文章编号：1003-5214 (2019) 04-0737-07

Preparation and Properties of Solid Electrolytes Based on
Polyurethane with High Lithium Salt Content

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SHI Gao-jian, MA Pei-yu, SONG You-xin, BAO Jun-jie, HUANG Yi-ping, XU Ge-wen
（Anhui Province Key Laboratory of Environment-Friendly Polymer Materials, College of Chemistry & Chemical
Engineering, Anhui University, Hefei 230601, Anhui, China）

Abstract: Polycarbonate polyurethane (PCPU) with 30% mass fraction of hard segment was synthesized
from isophorone diisocyanate, polycarbonate diol and diethylene glycol. The synthesized PCPU and lithium
bis(trifluoromethanesulfonyl)imide (LiTFSI) were combined to prepare solid polymer electrolytes (SPEs)
with various lithium salt mass fractions. The structure of polyurethane was analyzed by infrared
spectroscopy. The thermal properties of polyurethane and electrolytes were tested by TG and DSC. The
effects of different LiTFSI mass fractions on the electrochemical properties of the prepared electrolytes
were investigated by AC impedance and linear sweep voltammetry. The results indicated that with the
increase of LiTFSI mass fraction, the ionic conductivity of PCPU-based solid polymer electrolyte at room
temperature firstly increases then decreases and then increases. Especially, when the mass fraction of
LiTFSI was 70%, the ionic conductivity of the resulting solid polymer electrolyte reached the maximum
–8
value (1.28×10 S/cm) among the as-prepared electrolytes. The all-solid-state battery using this PCPU-
based electrolyte and LiFePO 4 delivered the discharge capacity of 153 mA·h/g at rate of 0.2 C at 60 ℃, and
the capacity retention reached 84% after 100 cycles.
Key words: polymer electrolyte; lithium battery; polycarbonate; polyurethane; electro-organic chemistry
and industry
Foundation items: Natural Science Foundation of Anhui Province (1808085QE173); Anhui Provincial
Natural Science Research Project (KJ2017A031)

因传统锂离子电池存在易泄露、易着火、易爆 成为当前研究的热点。固态聚合物电解质（SPE）
炸等安全问题 [1-2] ，以固态电解质制备的固态锂电池 因具有柔韧性好、加工成型简单、成本低等优点引

收稿日期：2018-08-01; 定用日期：2018-12-13; DOI: 10.13550/j.jxhg.20180575
基金项目：安徽省自然科学基金项目（1808085QE173）；安徽省高校科学研究项目（KJ2017A031）
作者简介：史高健（1993—），男，硕士生，E-mail：1660284956@qq.com。联系人：许戈文（1961—），男，教授，E-mail：gwxu@ahu.edu.cn。