高性能离子混合超级电容器的性容量衰变诱导的富含空位的LDH
Huan Xing1, Xiaoyang Deng1, Xiaoguang Wang2
1Laboratory of Advanced Materials and Energy Electrochemistry, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
Journal of colloid and interface science
|October 2, 2024
概括
在离子混合超级电容器中,具有空位的工程-层双氧化物 (NiCo-LDH) 显著提高了性能. 这种缺陷工程解决了高扫描速率的容量损失,提高了能量存储能力.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 层状双氧化物 (LDHs) 是电化学储能电极材料的有希望的.
- 不同扫描速率的LDH的显著容量差距限制了它们的性能.
- 这种容量损失归因于离子扩散的缓慢以及活性金属离子的可逆性降低.
研究的目的:
- 为了合成电沉积的-层双氧化物 (NiCo-LDH).
- 调查和解决高扫描速率LDH的容量差距.
- 为了提高NiCo-LDH在电化学储能应用中的性能.
主要方法:
- 合成电沉积的-层双氧化物 (NiCo-LDH).
- 通过利用脱质反应的可逆性,创建具有富含空缺的NiCo-LDH (Hv丰富的LDH).
- 使用Hv丰富的LDH作为阴极和VS2作为阳极,制造和测试一个离子混合超级电容器 (Mg-HSC).
主要成果:
- 富含HV的LDH阴极在1Ag-1时表现出94.97mAhg-1的高特异容量,在20Ag-1时保持41.90mAhg-1.
- 该Mg-HSC装置实现了高能量密度为48.44Wh kg-1和功率密度为937.49W kg-1.
- 在能源存储中证明了缺陷工程LDH的实际应用价值.
结论:
- 用空位丰富NiCo-LDH有效地减轻了高扫描速率的容量退化.
- 富含Hv的LDH在Mg-离子混合超级电容器中表现出极好的电化学性能.
- 这项工作为LDH的缺陷工程提供了理论基础,扩大了它们在能源存储中的使用.
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