Reducing nickel-cobalt hydroxide crystallization for optimal nickel-zinc battery performance
Reducing nickel-cobalt hydroxide crystallization for optimal nickel-zinc battery performance
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减少镍钴氢氧化物结晶以获得最佳镍锌电池性能
DOI：
10.1007/s40843-022-2133-3
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发表时间：
2022-08
期刊：
影响因子：
--
通讯作者：
Hai-Chao Chen
中科院分区：
文献类型：
--
作者：
Chun Yang;Zhiwei Peng;Qingyu Zhao;Rui Liu;Shilin Yun;Zhiqiang Zhang;Meiqiang Fan;Haijie Cao;Hai-Chao Chen
低结晶的电活性材料由于其额外的晶界和离子扩散通道，在能量存储方面特别有前景，但其应用受到晶体样品在大多数应用中具有更高稳定性的共识的限制。在这里，我们开发了一种用n -甲基吡咯烷酮和水混合溶剂合成低结晶氢氧化镍钴（NiCo−OH−L）的溶剂热方法。对于镍锌电池（NZB）的应用，NiCo - OH - L被发现具有与其高结晶对应物相当的循环稳定性。然而，在1 - 50 A g−1电流区域，它显示出容量增加和容量保持。优异的性能是由于低结晶结构，具有较大的比表面积和降低的电荷转移阻力。此外，NiCo−OH−L中的钴成分提高了其速率性能和循环稳定性。结果表明，NiCo−OH−L在1a g−1条件下的容量为238.9 mA h g−1，在50a g−1条件下的容量为116.4 mA h g−1，具有高容量和高速率的性能。更重要的是，NiCo−OH−l组装的NZB在不同电流和循环周期下表现出一致的性能。
Electroactive materials with low crystallization are particularly promising for energy storage owing to additional grain boundaries and ion diffusion channels, but their applications are limited by the consensus that crystalline samples have higher stability in most applications. Here, we developed a solvothermal method for synthesizing low-crystallized nickel-cobalt hydroxide (NiCo−OH−L) using N-methylpyrrolidone and water-mixed solvents. For nickel-zinc battery (NZB) applications, the NiCo−OH−L was found to have comparable cycling stability to its high-crystallized counterpart. However, it showed an increased capacity and capacity retention in the current region of 1–50 A g−1. The superior performance was due to the low-crystallized structure, which has a large specific surface area and reduced charge transfer resistance. Furthermore, the cobalt constitution in the NiCo−OH−L improves its rate performance and cycling stability. As a result, the NiCo−OH−L had a capacity of 238.9 mA h g−1 at 1 A g−1 and maintained 116.4 mA h g−1 at 50 A g−1, indicating both high-capacity and high-rate performances. More significantly, the NiCo−OH−L-assembled NZB exhibited consistent performance under different currents and cycling cycles.
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