电化学介层扩张和双氧激活,用于快速的Mg-Ion运输和高容量的近一维TiS3
Pengcheng Jing1, Atsushi Inoishi2, Chengcheng Zhao1
1WestCHEM, School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, U.K.
概括
工程设计的三硫化阴极通过扩展间层显著提高离子电池的性能. 这增强了离子运输,并激活了双氧化还原化学,使得高容量和稳定的能量储存.
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:
- 离子电池 (MIB) 由于安全性和成本,对可持续的储能充满希望.
- 发展受限于具有较差离子传输和少数活性位点的阴极材料.
- 准-1D伪层三硫化物 (TiS3) 是一个尚未探索的正极材料.
研究的目的:
- 为了实现MIBs的TiS3阴极的性能突破.
- 研究层间工程和双氧还原化学对TiS3性能的影响.
主要方法:
- 通过1--1-甲基 (BMPyrr+) 间隔扩张TiS3的间层扩张.
- 使用双电离子/离子氧化还原化学 (Ti4+/Ti3+和S22-/S2-).
- 采用在操作和现场表征技术.
- 纳入纳米尺寸用于伪容量.
主要成果:
- 层间扩张改善了Mg2+扩散动力学,增加了可访问的氧化还原点.
- 激活的可逆Ti4+/Ti3+和S22-/S2-氧化还原对.
- 实现了高可逆容量 (高达300 mAh g-1 在100 mA g-1) 和优异的速率性能 (181 mAh g-1 在1000 mA g-1).
- 证明了长期循环稳定性,性能优于原始的TiS3和其他MIB阴极.
结论:
- 层间工程和双离子还氧化化学对于推进MIBs至关重要.
- 扩展的TiS3显示出作为高性能阴极材料的巨大潜力.
- 伪层TiS3提供了一个新的结构平台,用于多价值储能,超出了传统的分层硫化物.
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