Graphene-wrapped hollow ZnMn2O4 microspheres for high-performance cathode materials of aqueous zinc ion batteries
Graphene-wrapped hollow ZnMn2O4 microspheres for high-performance cathode materials of aqueous zinc ion batteries
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DOI：
10.1016/j.electacta.2019.05.147
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发表时间：
2019-09-10
影响因子：
6.6
通讯作者：
Chen, Hongzhe
中科院分区：
文献类型：
--
作者：
Chen, Linlin;Yang, Zhanhong;Chen, Hongzhe
尖晶石锰酸锌作为一种极具发展前景的锌离子电池正极材料，因其具有电压平台高、原料丰度高、成本低、无毒、环保等优点而受到广泛关注。但其固有的导电性差、体积膨胀大，往往导致比放电容量低、容量衰减快、循环稳定性差，阻碍了其实际应用。为了解决这些问题，制备了石墨烯包裹的空心ZnMn2O4微球（rGO@HM-ZMO）。rGO的附着成功地提高了电子导电性，降低了电荷传递阻力，空心结构可以有效地缓解Zn2+反复插入/提取过程中晶体结构的变化。所得到的rGO@HM-ZMO电极在0.3 a g（-1）下循环100次后具有146.9 mAh g（-1）的优越比放电容量和令人印象深刻的循环稳定性，在1 a g（-1）的高速率下循环650次后保持约72.7 mAh g（-1）的容量而不衰减，这优于一些报道的zbs阴极材料。这些电化学结果表明rGO@HM-ZMO复合材料可能是一种具有竞争力的ZIBs正极材料。(C) 2019 Elsevier Ltd.版权所有。
Spinel zinc manganate as a promising cathode material of zinc ion batteries (ZIBs) has received extensive attention owing to its advantages of high voltage platform, high abundance of raw material, low cost, non-toxicity and environmental friendliness. However, its inherent poor electrical conductivity and large volume expansion usually result in a low specific discharge capacity, fast capacity decay and poor cycling stability, which hinder its practical application. To alleviate these problems, graphene-wrapped hollow ZnMn2O4 microspheres (rGO@HM-ZMO) were prepared. The attachment of rGO successfully enhances the electronic conductivity and decreases the charge transfer resistance, and the hollow architecture can effectively alleviate the changes of crystal structure during the repeated Zn2+ insertion/extraction process. The resulting rGO@HM-ZMO electrode exhibits a superior specific discharge capacity of 146.9 mAh g(-1) after 100 cycles at 0.3 A g(-1) and impressive cycling stability which retains a capacity of around 72.7 mAh g(-1) without fading after 650 cycles at a high rate of 1 A g(-1), which are superior to some reported cathode materials of ZIBs. These electrochemical results suggest the rGO@HM-ZMO composite could be a competitive cathode material of ZIBs. (C) 2019 Elsevier Ltd. All rights reserved.