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首页> 外文期刊>ACS applied materials & interfaces >Revealing the Phase-Transition Dynamics and Mechanism in a Spinel Li4Ti5O12 Anode Material through in Situ Electron Microscopy
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Revealing the Phase-Transition Dynamics and Mechanism in a Spinel Li4Ti5O12 Anode Material through in Situ Electron Microscopy

机译：通过原位电子显微镜揭示尖晶石Li4Ti5O12阳极材料中的相变动力学和机理

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摘要

Spinel Li4Ti5O12 is considered as a promising anode material for long-life lithium-ion batteries because of the negligible volumetric variation during the insertion and extraction of Li ions. Phase transition is an inevitable process during the migration of Li ions, and the transition process and mechanism need detailed investigation down to the atomic scale. In this study, we investigated the behavior and mechanism on the phase transition of Li4Ti5O12 through in situ transmission electron microscopy (TEM). It has been found that the spinel-structured Li4Ti5O12 was gradually transformed to a rock salt structure under electron beam irradiation. A sharp interface with an epitaxial relationship was observed between the transformed rock salt phase and the parent spinel phase. Furthermore, the heterostructure with different crystal structures of Li4Ti5O12 has been precisely tailored with electron beam irradiation. Our detailed in situ TEM results and theoretical calculations led to unprecedented level on the understanding of phase-transition mechanism in Li4Ti5O12. This study demonstrates a possible approach to precisely engineer the crystal structure of materials and to realize a well-designed heterostructure in electrode materials.
机译：Spinel Li4Ti5O12被认为是长寿命锂离子电池的有希望的阳极材料，因为在插入和提取Li离子期间的体积变化可忽略不计和萃取。相转变是Li离子迁移过程中的不可避免的过程，过渡过程和机制需要详细调查原子规模。在这项研究中，我们研究了Li4Ti5O12通过原位透射电子显微镜（TEM）的相变的行为和机制。已经发现，在电子束照射下，尖晶石结构的Li4Ti5O12逐渐转化为岩盐结构。在转化的岩盐相和父尖晶石相之间观察到具有外延关系的尖锐界面。此外，用电子束照射精确地定制了Li4Ti5O12的不同晶体结构的异质结构。我们详细介绍了原位的TEM结果和理论计算导致了对LI4TI5O12中相转移机制的理解的前所未有的水平。该研究表明了一种可能的方法来精确地设计材料的晶体结构并实现电极材料中的精心设计的异质结构。

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