PEI-PEO基全固态电解质的性能

高农¹, 陈志刚¹, 王淑堂², 隋旭磊², 顾大明²

1.黑龙江工程学院电子工程系;2.哈尔滨工业大学理学院



摘要:

聚氧乙烯(PEO)基全固态复合电解质可作为高能全固态锂电池的电解质膜材料.采用溶液浇铸法,以PEO为基质,LiClO4为锂盐,聚乙烯亚胺(PEI)和柠檬酸(CA)及无机纳米粉体(NCA)做性能改进剂,制备PEI-PEO-LiClO4-CA-NCA全固态复合聚合物电解质(SCPE)膜,对其进行X射线衍射(XRD)表征和交流阻抗(EIS)测试.结果表明,PEI和NCA等的加入降低了PEO的结晶度,大大提高材料的室温电导率.所制备的SCPE膜的室温(25℃)电导率达5×10-4 S.cm-1,具有很好的力学强度和柔韧性.

关键词:  聚合物电解质  PEO  PEI  电导率

DOI：10.11918/j.issn.0367-6234.2011.04.029

分类号:O631.3

基金项目:哈尔滨市学科带头人基金项目(2007RFXXG014);黑龙江省教育厅科技项目(11531300)



Research on PEI-PEO based solid state polymer electrolyte

GAO Nong¹, CHEN Zhi-gang¹, WANG Shu-tang², SUI Xu-lei², GU Da-ming²

1.Department of Electronic Engineering,Heilongjiang Institute of Technology,150050 Harbin,China;2.School of Science,Harbin Institute of Technology,150001 Harbin,China

Abstract:

Polyethylene oxide(PEO)-based solid composite polymer electrolyte(SCPE) may be used as electrolyte material in high energy density all solid lithium batteries.The SCPE films made from PEI-PEO-LiClO4-CA-NCA were prepared using a solution casting method when PEO was used as matrix,LiClO4 as Li+donor,polyethylene imine(PEI),citric acid(CA),inorganic nano-powder(NCA),were used as properties improver.The products were characterized by X-ray diffraction(XRD) and the electrochemical impedance spectra(EIS) of the SCPE had been measured.The results show that the additives decrease the crystallinity of the SCPE films,improve the conductivity of the PEO-based SCPE.The conductivity of the SCPEreached 5×10-4 S·cm-1(25 ℃),while retaining a good mechanical strength and flexibility.

Key words:  polymer electrolyte  PEO  PEI  conductivity