%0 Journal Article
%T <br>
%A 于慧君
%A 冯金奎
%A 刘永鹏
%A 张煜婵
%A 费慧芳
%A 陈传忠
%A 魏传亮
%J 物理化学学报
%D 2020
%R 10.3866/PKU.WHXB201905015
%X 聚碳酸酯具有较高的介电常数和较强极性的碳酸酯基团，是一类高性能的聚合物固态电解质，但是它在全固态钠离子电池体系中的研究非常少。本文以简便的方法成功制备出了聚碳酸丙烯酯基全固态聚合物电解质，并研究了该全固态电解质在以3, 4, 9, 10-苝四甲酸二酐为正极的有机全固态钠电池中的应用。这种全固态聚合物电解质在钠离子电池中的应用能够有效提高钠离子电池的安全性，防止过充、电解液泄露甚至爆炸等一系列不安全因素带来的隐患。结果表明：这种聚碳酸丙烯酯基全固态聚合物电解质在室温下具有较高的电导率，并且循环前后的阻抗测试说明了该电解质与有机正极具有良好的兼容性。取代了传统液体有机电解液后，该全固态钠电池在室温下展示出了优异的循环性能，循环50周后，容量保持率为99.1%；然而，同类型的液体电池遭受了严重的容量衰减，循环50周后容量只有24.6 mAh·g-1，容量保持率仅为20.5%。<br>Sodium-ion batteries (SIBs) are promising candidates to replace lithium-ion batteries (LIBs) to meet the emergent requirements of various commercial applications. SIBs and LIBs are similar in many aspects, including their reduction potentials, approximate energy densities, and ionic semidiameters. Analogously, safety issues, including liquid leakage, high flammability, and explosiveness limit the usage of SIBs. All-solid-state batteries have the potential to solve the aforementioned problems. However, polycarbonates as promising solid electrolytes have been rarely exploited in all-solid-state SIBs. In addition, organic electrode materials, including non-conjugated redox polymers, carbonyl compounds, organosulfur compounds, and layered compounds, have been intensively investigated as part of various energy storage systems owing to their low cost, environmental friendliness, high energy density, and structural diversity. Nevertheless, the dissolution of small organic compounds in organic-liquid electrolytes has hindered its further applications. Fortunately, the utilization of solid polymer electrolytes combined with organic electrode materials is a promising method to prevent dissolution into the electrolyte and improve the cycling performance of SIBs. Thus, we proposed the utilization of a poly(propylene carbonate) (PPC)-based solid polymer electrolyte and cellulose nonwoven with a 3, 4, 9, 10-perylene-tetracarboxylicacid-dianhydride (PTCDA) cathode in an all-solid-state sodium battery (ASSS). The solid electrolyte significantly enhanced the safety of the SIB and was successfully synthesized via a facile method. The morphology of the as-prepared solid electrolyte was examined by electron scanning microscopy (SEM). Furthermore, the electrochemical performances of the PTCDA/Na battery with organic-liquid and solid electrolytes at room temperature were compared. The SEM results demonstrated that the solid polymer electrolyte and sodium bis(fluorosulfonyl)imide (NaFSI) were evenly distributed inside the pores of the nonwoven cellulose. The ionic conductivity of the composite solid polymer electrolyte (CSPE) at room temperature was 3.01 × 10-5 S·cm-1, suggesting that the
%U http://www.whxb.pku.edu.cn/CN/Y2020/V36/I5/1905015