Nano-Resolution TXM-XANES Study of the Chemistry and Morphology of Lithium Battery Cathode Materials
GAO Ruo-yang1, 2, 3, ZHANG Ling3*, TAO Fen3, WANG Jun3, SU Bo1, 2, 3, BI Zhi-jie4, DU Guo-hao3, DENG Biao1, 2, 3*, XIAO Ti-qiao3
1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
4. College of Physics, Qingdao University, Qingdao 266071, China
Abstract：High-nickel ternary cathode materials for lithium-ion batteries are one of the research hot spots in energy storage. After multiple cycles, the internal chemical in homogeneity and morphological defects of the materials will cause battery failure and performance degradation. Understanding changes in battery capacity decay and their causes requires fast, efficient and non-destructive tests of materials. Transmission X-ray Microscope (TXM) based on synchrotron radiation is a nanometer-resolved non-destructively imaging technique for internal structure research. In recent years, with the development of high-brightness and high-performance synchrotron radiation light sources, TXM technology based on synchrotron radiation has developed rapidly, which makes TXM imaging methods have higher experimental efficiency and spatial resolution. X-ray nano-spectral imaging (TXM-XANES) is an imaging method that combines TXM with X-ray Absorption Near Edge Structure (XANES). TXM-XANES can characterize the spatial distribution and chemical state of internal elements of micron-scale energy materials on the nanoscale. It solves the problem of the lack of overall characterization due to the characterization of local regions and the characterization of the average value properties but missing local chemical state changes of materials. As a multimodal joint characterization technology based on TXM, TXM-XANES has gradually become one of the important experimental methods for energy materials research. This paper first introduces the nano-3D imaging beamline in SSRF and its TXM imaging system, then expounds the principle and characteristics of the X-ray nano-spectral imaging method. The powder LiNi0.6Co0.2Mn0.2O2(NCM622) of cathode-high nickel-layeredterary oxide material for lithium-ion batteries was characterized by spectral imaging and nano-CT methods. The spatial distribution information of Ni element chemical state and three-dimensional structure information of single particle in NCM622 single particle samples at the nanoscale were obtained. Finally, the three-dimensional x-ray nano-spectral imaging methods of battery materials are introduced and prospected.
高若阳，张 玲，陶 芬，汪 俊，苏 博，毕志杰，杜国浩，邓 彪，肖体乔. 锂电池正极材料化学及形貌的X射线纳米谱学成像研究[J]. 光谱学与光谱分析, 2024, 44(05): 1239-1244.
GAO Ruo-yang, ZHANG Ling, TAO Fen, WANG Jun, SU Bo, BI Zhi-jie, DU Guo-hao, DENG Biao, XIAO Ti-qiao. Nano-Resolution TXM-XANES Study of the Chemistry and Morphology of Lithium Battery Cathode Materials. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(05): 1239-1244.
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