Preparation and electrochemical properties of α-MnO2/rGO-PPy composite as cathode material for zinc-ion battery
Preparation and electrochemical properties of α-MnO2/rGO-PPy composite as cathode material for zinc-ion battery
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锌离子电池正极材料α-MnO2/rGO-PPy复合材料的制备及其电化学性能
DOI：
10.1007/s10853-021-06266-6
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发表时间：
2021-07
影响因子：
4.5
通讯作者：
Yurong Ren
中科院分区：
文献类型：
--
作者：
Tong Niu;Jianbin Li;Yanli Qi;Xiaobing Huang;Yurong Ren
水基锌离子二次电池，尤其是Zn-MnO 2水基电池，因其容量高、环境友好、安全可靠等优点而受到广泛关注。但由于MnO 2的低电导率和锰的溶解，阻碍了其作为高倍率性能和良好循环稳定性的ZIB阴极材料的应用。采用原位自聚合法在α-MnO 2/rGO纳米线表面包覆导电聚吡咯。当用作ZIB的阴极材料时，α-MnO 2/rGO-PPy在0.5 A g− 1下显示出248.8 mAh g− 1的可逆容量，并且在100次循环后仍然达到213.8 mAh g− 1，与α-MnO 2/rGO和α-MnO 2相比，表现出更高的性能。其主要原因是聚吡咯包覆和还原氧化石墨烯的引入，不仅缓解了Mn的溶解，而且提高了整个电极的电导率。
Aqueous zinc-ion secondary batteries (ZIBs), especially Zn-MnO2aqueous battery, have been stirred up widespread concern due to the high capacity, environmental friendliness, and reliable safety performance. However, low conductivity of MnO2and the dissolution of manganese will hinder its application as cathode material for ZIBs with high rate performance and excellent cycle stability. In this work, α-MnO2/rGO nanowires were coated with conductive polypyrrole via in situ self-polymerization. As used as cathode material for ZIBs, α-MnO2/rGO-PPy shows the reversible capacity of 248.8 mAh g−1at 0.5 A g−1and still achieves 213.8 mAh g−1after 100 cycles, demonstrating much enhanced performance compared with α-MnO2/rGO and α-MnO2. The excellent performances should be due to the polypyrrole coating and incorporation of reduced graphene oxide, which not only alleviate the dissolution of Mn but also improve the conductivity of the whole electrode.
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