Novel configuration of poly(vinylidenedifluoride)-based gel polymer electrolyte for application in lithium-ion batteries
Novel configuration of poly(vinylidenedifluoride)-based gel polymer electrolyte for application in lithium-ion batteries
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DOI：
10.1016/j.jpowsour.2015.06.068
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发表时间：
2015-10-30
影响因子：
9.2
通讯作者：
Scrosati, Bruno
中科院分区：
文献类型：
--
作者：
Fasciani, Chiara;Panero, Stefania;Scrosati, Bruno
在此，我们提出了一种新的聚（偏二氟乙烯）（PVdF）为基础的凝胶聚合物电解质（GPE）的锂离子电池，LIB的应用。GPE在空气中制备为干燥的柔性膜，并在LIB组装期间与常规液体有机电解质直接凝胶化。本文最初报道的干凝胶保持其结构完整性，这是由于其基质中存在结晶的EC溶剂，避免了结构塌陷，如TGA分析所示。通过避免使用受控气氛，GPE易于处理并且适于卷对卷按比例放大，即普通凝胶膜所缺少的特性。扫描电子显微镜（SEM）证明了干膜前体的微米聚合物网络充当凝胶化的支撑基质。电化学阻抗谱（EIS）测试和恒电流测试表明，锂电极/凝胶电解质界面稳定性好，锂迁移数也较好。分别使用磷酸铁锂（LiFePO 4，LFP）和石墨（C）作为对电极的基于凝胶电解质的锂半电池以及全C/LFP锂离子电池的循环测试证实了本工作中开发的GPE适用于稳定，低成本和环境友好的储能系统。(C)2015 Elsevier B. V.版权所有。
Herein we propose a novel poly(vinylidene difluoride) (PVdF)-based gel polymer electrolyte (GPE) for application in lithium-ion batteries, LIBs. The GPE is prepared under air as a dry, flexible film and directly gelled during LIB assembly with a conventional liquid organic electrolyte. The dry-gel here originally reported maintains its structural integrity due to the presence of crystallized EC-solvent within its matrix that avoids structural collapse, as demonstrated by TGA analysis. By avoiding the use of controlled atmosphere, the GPE is easy to handle and suitable for roll-to-roll scaling-up, i.e. characteristics missed by the common gel membranes. Scanning Electron Microscopy (SEM) evidences a micrometric polymer network of the dry membrane precursor acting as the support matrix for the gelation. Electrochemical impedance spectroscopy (EIS) measurements and galvanostatic tests suggest a good stability of the lithium electrode/gel electrolyte interface and a satisfactory lithium transference number. Cycling tests of gel-electrolyte-based lithium half-cells using lithium iron phosphate (LiFePO4, LFP) and graphite (C), respectively, as counter electrodes, as well as of a full C/LFP lithium-ion battery confirm the suitability of the GPE developed in this work for application in stable, low cost and environmentally friendly energy storage systems. (C) 2015 Elsevier B.V. All rights reserved.