调节Ni位点上的3d轨道占用率,可以为性Zn电池提供高速且耐用的Ni(OH)2阴极
Diyu Xu1, Wei Xu2, Dezhou Zheng2
1Jiangsu Key Laboratory for Biofunctional Molecules, College of Life Science and Chemistry, Jiangsu Second Normal University, Nanjing 210013, PR China; MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry, The Key Lab of Low-carbon Chem & Energy Conservation of Guangdong Province, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, PR China.
Journal of colloid and interface science
|October 10, 2024
概括
在Co/Cu共中,优化了氧化 (Ni(OH) 2) 阴极,用于电池. 这种轨道工程策略增强了氧化吸附/脱附,提高了先进的能量存储容量和循环稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 电池技术 电池技术
背景情况:
- 水性性- (Ni-Zn) 电池在阴极容量和循环稳定性方面存在限制.
- 在β-氧化 (β-Ni(OH) 2) 中,不良的氧化 (OH-) 吸附/脱附动力学阻碍了性能.
研究的目的:
- 为了提高β-Ni(OH) 2阴极的电化学性能.
- 通过原子级别的修改来优化OH-吸附/脱附动态.
- 开发一种用于储能材料的新型轨道工程战略.
主要方法:
- 对β-Ni(OH) 2进行Co/Cu共,从而产生Co-Cu-Ni(OH) 2.
- 密度函数理论 (DFT) 计算分析电子结构和轨道相互作用.
- 电化学测试以评估容量,循环稳定性和能量密度.
主要成果:
- 协同兴奋剂和Cu-兴奋剂优化了Ni中心在β-Ni(OH中的3d轨道占用2.
- 优化的轨道配置导致改善OH-吸附/脱附动力学.
- 同--- (OH) 2阴极在50 mA cm-2.2时实现了高面积容量 (0.83 mAh cm-2) 和重力学容量 (164.3 mAh g-1).
- 在高质量负载下 (13.5 mg cm-2) 持久容量为 170.8 mAh g-1,周期超过 1000 次.
- 组装的Ni-Zn电池表现出0.98 mWh cm-2的峰值能量密度和出色的耐用性.
结论:
- 通过Co/Cu共兴奋剂进行轨道工程是一种有效的策略,可以提高Ni(OH) 2阴极性能.
- 优化的Co-Cu-Ni(OH) 2材料为Ni-Zn电池提供了更高的容量和长期稳定性.
- 这种方法在开发下一代高性能储能解决方案方面具有重大潜力.
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