通过双站式兴奋剂来提高O3型分层氧化物阴极的储存性能
Shuo Shi1, Qian Yang1, Simi Sui1
1Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300401, China.
Nano letters
|June 11, 2025
概括
和锡双站点注增强了离子电池 (SIB) 的O3型层状氧化物阴极材料. 这一策略改善了动力学,结构稳定性和循环性能,以更好地储存.
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:
- 由于含量高,O3型层氧化物是离子电池 (SIB) 的有希望的阴极材料.
- 这些材料往往表现出不良的电化学动力学,不可逆转的相位过渡和结构性降解,限制了它们在SIB中的性能.
- 现有的挑战包括不满意的储能和不良的循环稳定性.
研究的目的:
- 为了提高SIBs的O3型分层氧化物阴极材料的电化学性能.
- 调查 (Ca) 和锡 (Sn) 双站点兴奋剂策略的有效性.
- 改善阴极材料的结构稳定性,反应动力学和循环寿命.
主要方法:
- 在O3型分层氧化物阴极材料上采用了Ca/Sn双位点兴奋剂策略.
- 改性材料Na0.98Ca0.01Ni0.33Fe0.33Mn0.315Sn0.015O2进行了合成和表征.
- 评估了电化学性能,包括循环稳定性和速率能力.
主要成果:
- Ca/Sn双位点注调节了过渡金属 (TM) 离子的协调环境和化学键.
- 这导致了显著更快的电荷转移动力学和高度可逆的相位过渡,体积变化最小.
- 合物材料表现出更好的结构稳定性,抑制TM溶解,并在循环过程中保持粒子完整性,从而导致卓越的循环稳定性和出色的速率性能.
结论:
- Ca/Sn双位点兴奋剂是提高O3型层状氧化物正极材料的储能性能的一个关键策略.
- 协同作用的兴奋剂效应增强了电化学动力学和结构完整性,克服了无兴奋剂材料的局限性.
- 这项研究为设计先进的离子电池的高性能阴极材料提供了宝贵的指导.
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