"Two Birds with One Stone": F Doping Ni-Co Hydroxide as High-Performance Cathode Material for Aqueous Zn Batteries.
"Two Birds with One Stone": F Doping Ni-Co Hydroxide as High-Performance Cathode Material for Aqueous Zn Batteries.
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——一石二鸟——：F掺杂Ni·Co氢氧化物作为水系锌电池高性能正极材料
DOI：
10.3390/nano12101780
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发表时间：
2022-05-23
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正极材料由于容量低、循环稳定性差，长期以来阻碍了水系锌电池（AZB）的发展。在这里，设计了“一石二鸟”策略来优化AZBs的Ni-Co氢氧化物正极材料（NCH），它在成分调整和形貌主要化方面发挥着重要作用。氟掺杂镍钴氢氧化物（FNCH）表现出独特的纳米阵列结构，由二维片状单元组成，为氧化还原反应提供丰富的活性位点。一系列分析证明 FNCH 具有改善的导电性和增强的电化学活性。凭借独特的形貌和调整的特性，FNCH 呈现出比 NCH 更高的放电比容量、更优越的倍率性能和竞争性循环稳定性。结果，由FNCH正极和Zn负极组装的水性锌电池在1 mA cm-2下表现出0.23 mAh cm-2的高容量，并在10 mA cm-2下保留0.10 mAh cm-2的容量。更重要的是，FNCH-Zn电池在3000次循环后没有表现出容量衰减，在8 mA cm−2时容量为0.15 mAh cm−2，表明其具有优异的循环性能。这项工作为开发水性锌电池的高性能阴极提供了一种简便的方法。
Cathode materials have impeded the development of aqueous Zn batteries (AZBs) for a long time due to their low capacity and poor cycling stability. Here, a “two birds with one stone” strategy is devised to optimize the Ni–Co hydroxide cathode material (NCH) for AZBs, which plays an essential role in both composition adjustment and morphology majorization. The F-doped Ni–Co hydroxide (FNCH) exhibits a unique nanoarray structure consisting of the 2D flake-like unit, furnishing abundant active sites for the redox reaction. A series of analyses prove that FNCH delivers improved electrical conductivity and enhanced electrochemical activity. Contributing to the unique morphology and adjusted characteristics, FNCH presents a higher discharge-specific capacity, more advantageous rate capability and competitive cycling stability than NCH. As a result, an aqueous Zn battery assembled with a FNCH cathode and Zn anode exhibits a high capacity of 0.23 mAh cm−2 at 1 mA cm−2, and retains 0.10 mAh cm−2 at 10 mA cm−2. More importantly, the FNCH–Zn battery demonstrates no capacity decay after 3000 cycles with a conspicuous capacity of 0.15 mAh cm−2 at 8 mA cm−2, indicating a superior cycling performance. This work provides a facile approach to develop high-performance cathodes for aqueous Zn batteries.
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