Abstract With the increasing demand for preparing energy storage devices, composites containing metal oxides, have been widely developed and used as supercapacitors. However, the electrochemical performances of such materials are unable to be satisfied owing to the inherent poor conductivity. Herein, we employ “in-situ pyrolysis” approach to fabricate composite electrode materials without binding agents, which are obtained by the direct calcination of the mixture MnO2 and poly(vinylidene difluoride) coated on carbon cloths, generating a family of binder-free electrode materials BE-X. For comparison, another family of electrode materials CE-X have been obtained through the conventional method. Naturally, two different families of electrode materials are prepared and exhibit different electrochemical performances. In general, the performances of electrode materials prepared by an “in-situ pyrolysis” approach are better than those of electrode materials via the conventional method, indicating the enhanced adhesion between electrode materials and current collectors could be benefit for the electrochemical process. Among all prepared electrode materials, BE-7 exhibits the best performance (5.44 F·cm-2 at 5 mV·s-1) as well as a good rate stability. Furthermore, a flexible symmetric supercapacitor device based on BE-7 is also prepared, and exhibits an areal capacitance of 100.50 mF·cm-2.

中文翻译：

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MnO2/PVDF 复合材料在碳布上的原位热解及其增强的电化学性能

摘要 随着对制备储能装置的需求不断增加，含有金属氧化物的复合材料已被广泛开发并用作超级电容器。然而，由于其固有的导电性差，这些材料的电化学性能无法得到满足。在这里，我们采用“原位热解”的方法来制造没有粘合剂的复合电极材料，该材料是通过涂覆在碳布上的 MnO2 和聚偏二氟乙烯的混合物直接煅烧获得的，从而产生了一系列无粘合剂电极材料 BE-X。为了进行比较，通过常规方法获得了另一类电极材料 CE-X。自然地，制备了两种不同系列的电极材料并表现出不同的电化学性能。一般来说，通过“原位热解”方法制备的电极材料的性能优于通过常规方法制备的电极材料，表明电极材料与集流体之间增强的粘附可能有利于电化学过程。在所有制备的电极材料中，BE-7 表现出最好的性能（5.44 F·cm-2 at 5 mV·s-1）以及良好的倍率稳定性。此外，还制备了基于 BE-7 的柔性对称超级电容器器件，其面积电容为 100.50 mF·cm-2。在所有制备的电极材料中，BE-7 表现出最好的性能（5.44 F·cm-2 at 5 mV·s-1）以及良好的倍率稳定性。此外，还制备了基于 BE-7 的柔性对称超级电容器器件，其面积电容为 100.50 mF·cm-2。在所有制备的电极材料中，BE-7 表现出最好的性能（5.44 F·cm-2 at 5 mV·s-1）以及良好的倍率稳定性。此外，还制备了基于 BE-7 的柔性对称超级电容器器件，其面积电容为 100.50 mF·cm-2。