硫电池中的金属-N 协调:抑制催化剂被动化
Xin Ao1,2, Yang Kong1, Shangquan Zhao2
1International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, 518060, China.
Angewandte Chemie (International ed. in English)
|September 21, 2024
概括
金属-协调可以防止-硫 (Li-S) 电池中的催化剂被动化. 这一策略提高了催化剂的稳定性,提高了Li-S电池的性能,为先进的储能解决方案提供了新的途径.
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:
- 硫 (Li-S) 电池是下一代储能设备的有希望的新一代储能设备.
- 催化剂加快了多硫化物转化反应,但催化剂被动阻碍了性能.
- 金属-N协调在防止催化剂被动化的作用尚未得到充分研究.
研究的目的:
- 调查金属-N协调在防止Li-S电池中催化剂被动化的作用.
- 为了证明Ni-N4协调在提高Li-S电池性能方面的有效性.
主要方法:
- 研究了硫和催化剂之间的相互作用.
- 研究了Ni-N4协调对硫稳定性和聚硫化物转化动力学的影响.
- 评估了使用Ni-N4修改硫阴极的Li-S电池的电化学性能.
主要成果:
- 不协调的催化剂因NiSx形成而被动化.
- Ni-N4协调稳定硫,防止被动化.
- Ni-N4催化剂具有快速的聚硫化物转化动力.
- 使用Ni-N4的硫阴极表现出高速率能力 (604.11 mAh g-1在3°C) 和出色的循环稳定性 (在2°C下1000个循环中每循环衰变0.046%).
- 无源化抑制效应适用于各种过渡金属和协调号.
结论:
- 金属-N协调是抑制Li-S电池中催化剂被动化的关键因素.
- Ni-N4协调为开发稳定和高性能Li-S电池提供了一个有前途的战略.
- 这项研究促进了对Li-S系统中催化剂机制的理解.
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