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在这种情况下,多个动态相变的原子级解密和可逆的储存在三级金属硫化物阳极中

Ruining Fu¹, Jianhai Pan², Mingyuan Wang¹

¹SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 210096, People's Republic of China.

|June 16, 2023

概括

金属硫化物对离子电池具有前景. 这项研究揭示了BiSbS3阳极中的原子级储存机制,揭示了提高电池性能至关重要的新相变.

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
纳米技术纳米技术

背景情况:

三级金属硫化物 (TMSs) 为储存提供了协同效益.
了解离子电池 (SIB) 中TMS阳极的动态机制对于性能提升至关重要.
在化/脱过程中复杂的结构演变和反应动力学仍然不完全理解.

研究的目的:

为了阐明TMS阳极在循环过程中的实时,原子级储存机制.
研究一个代表性的BiSbS3阳极中的动态结构演变和相变.
为优化SIB中的TMS阳极性能提供见解.

主要方法:

在现场传输电子显微镜 (TEM) 用于实时原子级观测.
在循环过程中使用X射线衍射 (XRD) 进行结构分析.
密度函数理论 (DFT) 计算和电化学测试进行验证.

主要成果:

在化过程中观察到多个以前未被探索的相位转换 (间隔,两步转换,两步合金).
确定了中间阶段 (Na2BiSbS4,Na2BiSb) 和最终的化产品 (Na6BiSb,Na2S).
确定了BiSbS3和Na6BiSb之间的可逆相变,其中BiSb作为单相.

结论:

该研究提供了BiSbS3阳极中储存机制的详细原子层次理解.
识别的可逆相变通路为SIBs设计高性能TMS阳极提供了一种策略.
这些发现对先进的储能材料的开发有重大影响.

关键词:

电化学性能电化学性能电化学性能在位传输电子显微镜 (TEM)阶段转换阶段转换的储存机制的储存机制三元金属硫化物的阳极.

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