摘要
以聚碳酸酯二元醇(PCDL)和六亚甲基二异氰酸酯(HDI)为主要原料,1,4-丁二醇(BDO)和荧光小分子二元醇N,N-二羟乙基苯胺-β-三联吡啶(TPPDA)为扩链剂,制备了一种热塑性荧光聚氨酯,其与双三氟甲烷磺酰亚胺锂(LiTFSI)共混制备了荧光聚氨酯电解质(FPU)。采用傅里叶变换红外光谱仪、荧光光谱仪、拉伸测试仪、同步热分析仪、电化学工作站和电池测试仪对制备的电解质进行了结构、光学性能、力学性能、热稳定性能和电化学性能的测试与分析。结果表明,随着膜内LiTFSI质量分数的增加,荧光强度增大;LiTFSI质量分数为30%制备的荧光聚氨酯电解质膜(FPU-3)拉伸强度达到4.5 MPa,电导率达到1.03×10^–4 S/cm;采用LiTFSI质量分数为30%的荧光聚氨酯电解质膜与磷酸铁锂正极和锂金属负极组装的全固态电池表现出良好的倍率与循环性能,在80℃、0.2 C和1.0 C倍率下首次放电比容量分别达到164和112 mA·h/g。
A fluorescent polyurethane was synthesized using polycarbonate diol(PCDL)and hexamethy lenediisocyanate(HDI)as main raw materials,1,4-butanediol(BDO)and N,N-dihydroxyethylaniline-β-terpyridine(TPPDA)as chain extender.Then,the fluorescent polyurethane was mixed with lithium bis[(trifluoromethyl)sulfonyl]azanide(Li TFSI)to obtain a series of fluorescent polyurethane-based electrolytes(FPU).The structure,optical properties,mechanical properties,thermal stability and electrochemical properties of the prepared electrolytes were tested and analyzed by Fourier transform infrared spectrometer,fluorescence spectrometer,tensile tester,synchronous thermal analyzer,electrochemical work station and battery tester.The results showed that the fluorescence intensity of electrolyte increased with the increase of LiTFSI mass fraction.When the mass fraction of LiTFSI was 30%,the prepared solid electrolyte(FPU-3)film possessed a tensile strength of 4.5 MPa with an ionic conductivity of 1.03×10^–4 S/cm.An all-solid-state battery which was assembled with lithium iron phosphate as cathode,lithium metal as anode and FPU-3 as solid state electrolyte membrane exhibited high rate performance and good circulation performance.At 80℃,the specific discharge capacity of the battery reached 164mA·h/g at 0.2C,while that reached 112 mA·h/g at 1.0C.
作者
王超
程亮
鲍俊杰
黄毅萍
许戈文
熊潜生
WANG Chao;CHENG Liang;BAO Jun-jie;HUANG Yi-ping;XU Ge-wen;XIONG Qian-sheng(School of Chemistry and Chemical Engineering,Key Laboratory of Environment-Friendly Polymer Materials of Anhui Province,Anhui Province Engineering Technology Research Center of Water-Borne Polymer Materials,Anhui University,Hefei 230601,Anftui,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2019年第12期2476-2481,共6页
Fine Chemicals
基金
安徽省自然科学基金(1808085QE173,1808085ME156)
安徽省高校科学研究项目(KJ2017A031,KJ2018ZD004)
关键词
荧光
聚氨酯
固态电解质
锂离子电池
有机电化学与工业
fluorescence
polyurethane
solid-state electrolyte
lithium ion battery
electro-organic chemistry and industry
