Ni (II) Coordination Supramolecular Grids for Aqueous Nickel‐Zinc Battery Cathodes
Ni (II) Coordination Supramolecular Grids for Aqueous Nickel‐Zinc Battery Cathodes
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DOI：
10.1002/adfm.202100443
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发表时间：
2021-03
影响因子：
19
通讯作者：
Xiyue Zhang;Jinjun He;Lijun Zhou;Haozhe Zhang;Qiushi Wang;Binbin Huang;Xihong Lu;Y. Tong;
中科院分区：
文献类型：
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作者：
Xiyue Zhang;Jinjun He;Lijun Zhou;Haozhe Zhang;Qiushi Wang;Binbin Huang;Xihong Lu;Y. Tong;
水性可充电镍锌电池（nzb）具有成本经济、安全可靠等优点。尽管有报道成功地获得了高利用率和稳定的Zn阳极，但NZBs的实际应用一直受到Ni基阴极容量密度的限制和降解的困扰。本文报道了具有128.12 mAh g−1理论容量的镍配体配位网格（NCGs），由于其丰富的开放金属位和灵活的网络结构，在保持良好可逆性的同时，提供了快速的二相反应。原位和非原位表征表明，石墨烯纳米片（GN）修饰的NCGs超分子显著提高了表面电荷，降低了超分子化合物的功函数。使用这种石墨烯有机-无机材料（G - NCGs）的Ni/ Zn电池在0.5 A G - 1下获得了113.8 mAh G - 1的高重量容量，在2000次循环后保持了50%的初始电容，即使在5.0 A G - 1的电流密度下也具有43.3 mAh G - 1的卓越倍率容量。
Aqueous rechargeable nickel‐zinc batteries (NZBs) have the advantages of economical cost and reliable safety. Despite reports of success in achieving high‐utilization and stable Zn anodes, the practical application of NZBs has been plagued by the restrictive capacity density and degradation of the Ni‐based cathode. Herein, it is reported that nickel‐ligand coordination grids (NCGs) with a high theoretical capacity of 128.12 mAh g−1 offer a fast faradic reaction while maintaining good reversibility due to the abundant open metal sites and flexible network structures. In situ and ex situ characterizations demonstrate that the graphene nanosheet (GN) modification of NCGs supramolecular substantially boosts surface charge and reducing the work function of supramolecular compounds. A Ni//Zn battery using such a graphene organic‐inorganic material (G‐NCGs) achieve a high gravimetric capacity of 113.8 mAh g−1 at 0.5 A g−1 with 50% of its initial capacitance retained after 2000 cycles and an exceptional rate capacity of 43.3 mAh g−1 even at the current density of 5.0 A g−1.