般的NiCo2O4与原子尺度可控制的氧气空隙,用于调节-硫电池中的硫逆氧运动
Ding Zhu1, Kuandi Wang1, Xiangcun Li1
1State Key Laboratory of Fine Chemicals, Chemical Engineering Department, Dalian University of Technology, Dalian 116024, China.
ACS applied materials & interfaces
|April 2, 2024
概括
研究人员开发了一种具有氧空缺的新型-氧化物催化剂,以提高-硫电池的稳定性. 这种催化剂有效地减轻了穿效应,并提高了实际应用的电化学性能.
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
- 催化剂是一种催化剂.
背景情况:
- -硫 (Li-S) 电池具有高的理论能量密度,但长期稳定性不佳.
- 多硫化物 (LiPSs) 的穿效应和硫的绝缘性阻碍了商业化.
- 有效的催化剂对于减轻LiPS穿和改善反应动力学至关重要.
研究的目的:
- 设计和合成一种用于Li-S电池的新型双金属氧化物催化剂.
- 调查氧空缺 (OV) 在提高催化剂性能方面的作用.
- 为了应对 LiPS 穿和 Li-S 电池缓慢动力学的挑战.
主要方法:
- 合成状-双金属氧化物 (NiCo2O4) 富含氧气空缺 (OV) 的合成.
- 可控制的合成以改变OV内容.
- 吸附实验和密度函数理论 (DFT) 模拟以研究LiPS吸附.
- 使用开发的催化剂对Li-S电池进行电化学性能测试.
主要成果:
- 尼科2O4OV催化剂证明了可控制的合成,具有不同的OV含量.
- 氧气空缺有效控制了电催化剂的电子结构和LiPS吸附/脱附.
- 增加的OV含量增强了LiPSs的结合能量和吸附能力.
- 催化剂促进了Li2S分解和Li+扩散,改善了电池动力学.
结论:
- 在NiCo2O4中空缺氧是一种有效的策略,以减轻LiPS穿效应.
- 开发的NiCo2O4-OV催化剂显著提高了Li-S电池的稳定性和电化学性能.
- 这项工作为开发下一代能源存储的先进催化剂提供了有希望的途径.
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