对于超高能离子电池的静电相互作用力的反向
Wei Guan1, Wei Wang1,2, Zheng Huang1
1State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China.
Angewandte Chemie (International ed. in English)
|January 29, 2024
概括
研究人员为离子电池 (AIB) 中的MXene阴极开发了一种充电调节策略. 用N和Co合MXenes增强了AlCl4-间隔,提高了用于先进能量存储的容量和能量密度.
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:
- 两维 (2D) MXenes是离子电池 (AIB) 的有希望的阴极材料.
- MXenes 的负面电荷阻碍了化离子 (AlCl4-) 的插入,限制了电池的性能.
- 现有的研究往往忽略了这种静电排斥效应.
研究的目的:
- 为了克服阻碍MXene阴极中AlCl4-间隔的静电排斥.
- 为了提高AIBs的MXene基阴极的容量和稳定性.
- 开发一个充电调节策略,以提高MXene阴极性能.
主要方法:
- 合成的 (N) 和 (Co) 合的MXene材料 (Ti3CNT x 和 Ti3CNT x @Co).
- 研究了兴奋剂对MXene表面的泽塔潜力的影响.
- 评估了AIBs中修改的MXene阴极的电化学性能.
主要成果:
- 兴奋剂改变了MXene的表面电荷,从负变为近中性和正.
- 减少了MXene和AlCl4-.之间的静电排斥和诱导的静电吸引力.
- 在优化的Al-MXene电池中实现了240 mAh g-1的超高容量和432 Wh kg-1的能量密度.
结论:
- 电荷调节策略有效地增强了MXene阴极中的AlCl4间隔.
- 与石墨相比,修改后的MXene阴极提供了显著提高的容量和能量密度.
- 这些发现为高性能离子电池提供了可行的途径.
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