Journal
ACS ENERGY LETTERS
Volume 2, Issue 5, Pages 1240-1245Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.7b00263
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Funding
- DOE Office of Science [DE-SC0012704]
- Ministry of Science and Technology of China [2016YFB0100300]
- U.S. Department of Energy, the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies through Advanced Battery Material Research (BMR) program (Battery500 consortium) [DE-SC0012704]
- National Key Research and Development Program of China [2016YFA0400900]
- National Natural Science Foundation of China [11535015, U1632110]
- Open Research Foundation of State Key Lab. of Digital Manufacturing Equipment & Technology in Huazhong University of Science Technology
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
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For designing new battery systems with higher energy density and longer cycle life, it is important to understand the degradation mechanism of the electrode material, especially at the individual particle level. Using in situ transmission X-ray microscopy (TXM) coupled to a pouch cell setup, the inhomogeneous Li distribution as well as the formation, population, and evolution of inactive domains in a single LiCoO2 particle were visualized as it was cycled for many times. It is found that the percentage of the particle that fully recovered to the pristine state is strongly related to the cycling rate. Interestingly, we also observed the evolution of the inactive region within the particle during long-term cycling. The relationship between morphological degradation and chemical inhomogeneity, including the formation of unanticipated Co metal phase, is also observed. Our work highlights the capability of in situ TXM for studying the degradation mechanism of materials in LIBs.
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