摘要
将钠离子导体Na-β’’-Al2O3作为活性填料引入聚氧化乙烯(PEO)/双(三氟甲基磺酰)亚胺钠(NaTFSI)固体聚合物电解质(SPE)中,得到有机–无机复合固体聚合物电解质(CPE)。对SPE及CPE的相结构、相转变、离子电导率、离子迁移数及电化学稳定性等基础理化性质进行了表征分析,对两者在固态钠电池Na3V2(PO4)3@C||Na中的电化学性能进行了测试。结果表明:Na-β’’-Al2O3的引入,有效提升了钠离子迁移数(SPE为0.19,CPE为0.71)和钠离子电导率(80℃时,SPE为1.65×10–4 S/cm,CPE为8.19×10–4 S/cm)。基于CPE的固态钠电池表现出更加优异的循环稳定性,0.5 C循环100周后容量保持率为93.9%,2.0 C循环500周后容量保持率为74.0%。
An organic-inorganic composite polymer electrolyte(CPE)was constructed via introducing an active filler of Na-β’’-Al2O3 into a solid-state polymer electrolyte(SPE)composed of poly(ethylene oxide)(PEO)and sodium bis(trifluoromethanesulfonyl)-imide(NaTFSI).The phase composition,ionic conductivity,Na+transference number,and electrochemical stability were investigated.The electrochemical properties of SPE and CPE in Na||Na3V2(PO4)3@C solid-state sodium batteries were obtained.The results show that the CPE has a greater Na+transference number of 0.71 than SPE(i.e.,0.19)and a higher Na+conductivity of 8.19×10–4 S/cm than SPE(i.e.,1.65×10–4 S/cm)at 80℃.The CPE exhibits a superior cycling stability with capacity retentions of 93.9%after 100 cycles at 0.5 C and 74.0%after 500 cycles at 2.0 C in Na|CPE|Na3V2(PO4)3@C solid-state batteries.
作者
张强强
苏醒
陆雅翔
胡勇胜
ZHANG Qiangqiang;SU Xing;LU Yaxiang;HU Yongsheng(Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2020年第7期939-946,共8页
Journal of The Chinese Ceramic Society
基金
国家重点研发计划(2016YFB0901500)
江汉大学光电化学材料与器件重点实验室开放项目(JDGD-201703)
国家自然科学基金(51725206,51421002)
中国科学院战略重点研究项目(XDA21070500)。
