Combining In Situ Synchrotron X‐Ray Diffraction and Absorption Techniques with Transmission Electron Microscopy to Study the Origin of Thermal Instability in Overcharged Cathode Materials for Lithium‐Ion Batteries

阴极 材料科学 热失控 透射电子显微镜 锂(药物) 衍射 热稳定性 成核 分析化学(期刊) 化学物理 纳米技术 化学工程 光学 电池(电) 化学 热力学 物理化学 物理 医学 色谱法 内分泌学 功率(物理) 工程类
作者
Kyung‐Wan Nam,Seong‐Min Bak,Enyuan Hu,Xiqian Yu,Youngning Zhou,Xiaojian Wang,Lijun Wu,Yimei Zhu,Kyung Yoon Chung,Xiao‐Qing Yang
出处
期刊:Advanced Functional Materials [Wiley]
卷期号:23 (8): 1047-1063 被引量:522
标识
DOI:10.1002/adfm.201200693
摘要

Abstract The thermal instability of the cathode materials in lithium‐ion batteries is an important safety issue, requiring the incorporation of several approaches to prevent thermal runaway and combustion. Systematic studies, using combined well‐defined in situ techniques, are crucial to obtaining in‐depth understanding of the structural origin of this thermal instability in overcharged cathode materials. Here time‐resolved X‐ray diffraction, X‐ray absorption, mass spectroscopy, and high‐resolution transmission electron microscopy during heating are combined to detail the structural changes in overcharged Li x Ni 0.8 Co 0.15 Al 0.05 O 2 and Li x Ni 1/3 Co 1/3 Mn 1/3 O 2 cathode materials. By employing these several techniques in concert, various aspects of the structural changes are investigated in these two materials at an overcharged state; these include differences in phase‐distribution after overcharge, phase nucleation and propagation during heating, the preferred atomic sites and migration paths of Ni, Co, and Mn, and their individual contributions to thermal stability, together with measuring the oxygen release that accompanies these structural changes. These results provide valuable guidance for developing new cathode materials with improved safety characteristics.
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