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首页> 外文期刊>Materials Chemistry and Physics >Improved electrochemical performance of amorphous MnO2 modified by a novel supermolecular compound
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Improved electrochemical performance of amorphous MnO2 modified by a novel supermolecular compound

机译：新型超分子化合物修饰的无定形MnO2的电化学性能改善

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A novel modification treatment to improve the electrochemical performance of amorphous, nano-sized MnO2 is proposed in this paper. An "in situ polymerization reaction" method was employed to obtain the MPz(dtn)(4) or PMPzS(8)-MnO2 composition material. TG, IR, XRD and TEM methods were adopted for material characterization. The experimental results reveal that the amorphous nature and small particle size (10-20 nm) of the parent MnO2 material can be preserved after MPz(dtn)(4) or PMPzS(8) modification treatment. Galvanostatic charge and discharge was carried out to test the electrochemical property of the resulting material. It indicates that all modified products show an improved electrochemical performance comparing with their parent MnO2 phase as being reflected by the higher capacity and enhanced cycle life. To investigate the mechanism for improved electrochemical performance, ac impedance technique was employed. Preliminary results suggest that the capacity and the cycleability of the composition material are improved in some degree which may be ascribed to the increasing of intercalation/deintercalation from inter-granular modified compounds. (C) 2004 Elsevier B.V. All rights reserved.
机译：本文提出了一种新型的改性处理方法，以提高非晶态，纳米级MnO2的电化学性能。采用“原位聚合反应”方法获得MPz（dtn）（4）或PMPzS（8）-MnO2组成材料。 TG，IR，XRD和TEM方法用于材料表征。实验结果表明，经MPz（dtn）（4）或PMPzS（8）改性处理后，母体MnO2材料的非晶态性质和小粒径（10-20 nm）可以保留。进行恒电流充电和放电以测试所得材料的电化学性能。这表明，所有改性产物均比其母体MnO2相具有更高的电化学性能，这体现在更高的容量和更长的循环寿命上。为了研究改善电化学性能的机理，采用了交流阻抗技术。初步结果表明，组合物材料的容量和循环能力在一定程度上得到了提高，这可能归因于颗粒间改性化合物的嵌入/脱嵌的增加。 （C）2004 Elsevier B.V.保留所有权利。

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