极地分子间隙减弱P2─S在MnPS中的结合3 迈向超高容量的储存
Xueyang Tu1,2, Ke Fan3, Baixin Peng1,2
1State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|November 16, 2024
概括
在三酸 (MnPS3) 中插入二烯胺 (DIPA) 增强了离子电池阳极性能. 这一战略提高了先进的储能材料的容量和循环稳定性.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 层状过渡金属三酸 (TMPS3) 由于其高理论容量,是离子电池 (SIB) 的有希望的阳极材料.
- 然而,TMPS3中强大的PS键限制了Na+合金,导致实用能力较低.
研究的目的:
- 通过插入极分子二烯胺 (DIPA) 来增强MnPS3的储存性能.
- 研究提高性能背后的机制,并探索设计高性能SIB阳极材料的新策略.
主要方法:
- 首次将DIPA插入到MnPS3.3中.
- 理论计算 (DFT) 来分析电子结构和粘合.
- 对容量和循环性能进行电化学测试.
- 在现场和现场表征以揭示插入机制.
主要成果:
- DIPA 间歇减弱了 P-S 键,并在 MnPS3 中移位了 S p 状态,增强了电化学活性和动力学.
- 扩大层间间距 (6.48至10.75 Å) 促进了更快的Na+扩散,增加了活性位点.
- DIPA-MnPS3在0.2 A g-1 时实现了1023 mAh g-1 的超高容量,以及卓越的循环稳定性 (10 A g-1 的 4200 个循环后保持 100%).
结论:
- DIPA间隔是一种有效的策略,可以提高MnPS3阳极的存性能.
- 与其他报道的用于SIB的TMPS3阳极相比,改性材料具有优越的电化学性能.
- 确定了一种准拓间隔机制,为未来的阳极材料设计提供了洞察力.
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