Strongly coupled zinc manganate nanodots and graphene composite as an advanced cathode material for aqueous zinc ion batteries
Strongly coupled zinc manganate nanodots and graphene composite as an advanced cathode material for aqueous zinc ion batteries
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强耦合锰酸锌纳米点和石墨烯复合材料作为水性锌离子电池的先进正极材料
DOI：
10.1016/j.ceramint.2020.01.148
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发表时间：
2020-06
期刊：
影响因子：
--
通讯作者：
Hongbing Zhan
中科院分区：
文献类型：
--
作者：
Zhifan Yao;Daoping Cai;Zhixiang Cui;Qianting Wang;Hongbing Zhan
高容量、中等工作电压的锰基氧化物作为水基锌离子电池(ZIB)的正极材料得到了广泛的研究。然而，其固有的导电性差、反应动力学缓慢、巨大的体积膨胀和锰物种在电解液中的溶解极大地限制了它的实际应用。本论文合成了均匀固定在界面作用强的还原氧化石墨烯上的超细锌锰氧化物纳米粒子(ZnMn2O4NDs/rGO复合材料)。与纯ZnMn2O4微球相比，该复合材料在0.2A−1电流密度下的放电容量为207.6 mA/g−1，并且具有更好的倍率能力和长期循环稳定性。令人印象深刻的是，水性锌//锌锰氧化物/氧化锌电池在137W/kg−1的功率密度下显示出266W/h kg−1的高能量密度，显示出巨大的实际应用潜力。其优异的性能归因于活性中心的丰富、离子扩散路径的缩短、电导率的提高和良好的结构稳定性。此外，电化学分析表明，该复合材料实现了有利于锌离子高效存储的反应动力学。本工作对高性能强偶联石墨烯复合材料的合理设计和合成具有一定的指导意义。
Manganese-based oxides with high capacity and moderate operation voltage have been extensively studied as promising cathode materials for aqueous zinc ion batteries (ZIBs). However, the inherent poor electrical conductivity, sluggish reaction kinetics, huge volume expansion and dissolution of manganese species in electrolyte greatly restrict their practical applications. Herein, ultrasmall ZnMn2O4nanodots uniformly anchored on reduced graphene oxide with strong interfacial interaction (ZnMn2O4NDs/rGO composite) is synthesized. Compared with the pure ZnMn2O4microspheres, the ZnMn2O4NDs/rGO composite displays a much higher discharge capacity of 207.6 mA h g−1at a current density of 0.2 A g−1, as well as better rate capability and long-term cycling stability. Impressively, the aqueous Zn//ZnMn2O4NDs/rGO battery exhibits a high energy density of 266 W h kg−1at a power density of 137 W kg−1, indicating great potential for practical applications. The excellent performance could be attributed to the abundant active sites, shortened ion diffusion pathway, improved electrical conductivity and good structure stability. Furthermore, electrochemical analyses reveal that favorable reaction kinetics towards efficient zinc ion storage is achieved in the composite. The present work might shed light on the rational design and synthesis of advanced strongly coupled graphene based composites as cathode materials for aqueous ZIBs.
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