Abstract
Planetary explorations of human beings necessitate the research of the influence of γ-radiation on lithium-ion cells. In this study, the radioactive Co-60 was used as the radiation source. The electrochemical performances of LiCoO 2/graphite full cells and LiCoO 2/Li half-cells with a LiPF 6-based electrolyte were measured before and after the radiation. The structural and compositional changes of the cell components were evaluated by means of X-ray diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR), and 1H nuclear magnetic resonance spectroscopy ( 1H NMR). The experimental results indicate that the cell performance is substantially deteriorated after the radiation due to two aspects of changes, i.e. radiation-induced defects in LiCoO 2 and production of carboxyl in the electrolyte. The cell degradation is more pronounced for the LiCoO 2/C full cells than for LiCoO 2/Li half-cells owing to the reaction between active lithium and the carboxyl.
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