Operando Spectroscopic Microscopy of LiCoO 2 Cathodes Outside Standard Operating Potentials
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
LiCoO2 can experience over-lithiation (over-discharge) in an electrochemical cell due to poor battery management, failure such as a short circuit, or when LiCoO2 is utilized as a negative electrode conversion material. Furthermore, in order to understand the chemical and morphological changes which occur during over-lithiation, LiCoO2 electrodes were studied during deep discharge to 0.8 V with operando X-ray absorption spectroscopy and spectroscopic X-ray microscopy. During over-lithiation, micron-sized LiCoO2 particles suffer significant cracking, pulverization and an incomplete conversion to Co metal. These irreversible morphological and structural changes then inflict permanent damage on the cathode even during a single over-lithiation event and highlight the need for more sophisticated battery management systems.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1394078
- Journal Information:
- Electrochimica Acta, Vol. 247, Issue C; ISSN 0013-4686
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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