SiO_(2)纳米纤维增强聚合物电解质的电化学性能  

Electrochemical Properties of Polymer Electrolyte Reinforced by SiO_(2) Nanofibers

作　　者：钟嘉炜 沈之川 杨坤 蒋世用 詹世英 胡海玲 施志聪[1] ZHONG Jiawei;SHEN Zhichuan;YANG Kun;JIANG Shiyong;ZHAN Shiying;HU Hailing;SHII Zhicong(Guangdong University of Tchnology,School of Materials and Energy,Guangzhou 510006,China;Chongqing University,School of Electrical Engineering,Chongqing 400044,China;Giree Altaimano New Energy Co,Ltd,Zhuhai 519090,China)

机构地区：[1]广东工业大学材料与能源学院,广州510006 [2]重庆大学电气工程学院,重庆400044 [3]格力钛新能源股份有限公司,珠海519090

出　　处：《硅酸盐学报》2022年第7期1883-1889,共7页Journal of The Chinese Ceramic Society

基　　金：珠海市产学研合作项目(ZH22017001200059PWC)。

摘　　要：复合聚合物电解质是未来固态锂电池最重要的候选电解质之一,但其中无机填料易团聚,难以形成连续的离子传输通路。通过静电纺丝和高温热处理手段得到柔性SiO_(2)纳米纤维多孔薄膜,采用扫描电子显微镜、Fourier变换红外光谱、X射线衍射和热重-微分热重法对样品进行了表征,系统研究了电纺前驱体溶液中正硅酸乙酯的占比和聚合物浓度对纳米纤维多孔薄膜形貌及柔性的影响。并以该多孔薄膜作为支撑体,制备了聚氧化乙烯(PEO)基复合聚合物电解质(CPE-SiO_(2))。对其电化学性能进行了测试,30℃时离子电导率达到2.52×10^(-5)/cm,60℃时LiFePO|CPE-SiO_(2)|Li半电池可以在1 C倍率下充放电稳定循环50次,Li|CPE-SiO_(2)|Li对称电池可在60℃下充放电稳定循环300 h,为下一代高性能全固态电池的商业化提供了一种行之有效的思路。Composite polymer electrolyte is one of the most promising electrolyte candidates for future solid state lithium batteries,but inorganic fillers used are prone to an agglomeration,thus being difficult to form a continuous ion transport pathway.Flexible SiO_(2)nanofiber porous membranes were fabricated by an electrospinning technique and a heating treatment process.The samples were characterized by scanning electron microscope,fourier transform infrared spectrometer,X-ray diffractometer,and thermogravimetry analyzer.The effects of TEOS proportion and polymer concentration in electrospinning precursor on the morphology and flexibility of the nanofiber porous membranes were investigated.Moreover,the electrochemical properties of PEO based composite polymer electrolyte (CPE-SiO_(2)) were analyzed.The ionic conductivity of this composite electrolyte can reach 2.52×10^(-5)/cm at 30℃.LiFePO|CPE-SiO_(2)|Li can be steadily charged/discharged for 50 times at 1 C rate and 60℃.Li|CPE-SiO_(2)|Li symmetric cell can keep a stable overpotential profile for 300 h with a low hysteresis at 60℃.This work provides an effective approach for the commercialization of next generation high-performance all-solid-state batteries.

关 键 词：固态锂电池 纳米纤维多孔薄膜 二氧化硅 复合聚合物电解质 电化学性能 

分 类 号：TM911[电气工程—电力电子与电力传动]