Thermal reactivity of three lithiated carbonaceous materials |
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Authors: | Jie Shu Miao Shui Fengtao Huang Dan Xu Yuanlong Ren |
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Institution: | (1) Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo, 315211, Zhejiang Province, People’s Republic of China |
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Abstract: | The thermal stabilities of hard carbon spherule (HCS), artificial graphite (AG), and natural graphite (NG) were investigated
by thermo-gravimetric differential scanning calorimetry (TG-DSC). After lithiation, AG shows the lowest onset exothermic temperature.
However, all there materials exhibit similar onset temperatures for thermal reactions after ten cycles. It is obvious that
the thermal behaviors of solid electrolyte interphase (SEI) film for HCS and AG change gradually with the electrochemical
cycling. In contrast, the thermal stability of the surface film on NG is maintained during repeated lithium ion insertion/extraction.
Because of their different Li storage behaviors, their thermal reactivities with electrolyte are quite different from each
other. Especially for HCS, it shows several successive and different exothermic peaks at the 1st and 11th lithiated states,
while both AG and NG display similar thermal reactivity before and after repeated cycles. In summary, it is found that thermal
properties of SEI layer and lithium in lithiated carbonaceous materials for all three samples have different impacts on the
whole thermal behaviors of electrode. |
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Keywords: | |
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