分层Na2Ti3O7作为非水性离子电池的超稳定间歇式阳极
Chunli Zuo1, Yihan Shao1, Ming Li2
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China.
ACS applied materials & interfaces
|June 25, 2024
概括
酸 (Na2Ti3O7) 是离子电池 (CIB) 的阳极,具有很高的容量和稳定性. 这项研究通过识别有效的阳极材料来推进CIB技术.
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 (CIB) 由于的低氧化还原潜力和丰富性而具有吸引力.
- 在CIB的挑战包括缓慢的Ca2+扩散动力学和有限的合适的电极材料,源于Ca2+的大离子半径和双价性质.
研究的目的:
- 引入Na2Ti3O7 (NTO) 作为非水性CIB的新型阳极材料.
- 在CIB中评估NTO的电化学性能和循环稳定性.
- 阐明NTO中Ca2+的离子介质机制和扩散途径.
主要方法:
- 在CIB中测试NTO作为阳极的电化学测试 (电荷-放电循环,速率能力).
- 在循环过程中对电极材料的结构分析.
- 密度函数理论 (DFT) 计算以调查Ca2+扩散途径.
主要成果:
- 在100 mA g-1下,NTO具有165 mA h g-1的高放电能力.
- 特殊的循环稳定性,在2000个循环后在500 mA g-1下保持80%的容量.
- 在第一个放电过程中,NTO转化为CaVII NAIX Ti3O7,从而在随后的循环中实现可逆的Ca2+间歇.
- DFT计算证实了NTO中的快速2D Ca2+扩散途径.
结论:
- Na2Ti3O7是用于非水性CIB的高性能阳极材料,其性能优于现有的间接阳极.
- 该NTO阳极显示出开发先进的高性能CIB的巨大潜力.
- 这项工作为未来对基于NTO的材料进行下一代能源存储的研究铺平了道路.
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