The Origin of the Residual Carbon in LiFePO4 Synthesized by Wet Milling
- The Origin of the Residual Carbon in LiFePO4 Synthesized by Wet Milling
- 박성빈; 박창규; 황진태; 조원일; 장호
- lithium iron phosphate; wet milling; mechanochemical reaction; rate capability; carbon coating
- Issue Date
- Bulletin of the Korean Chemical Society
- VOL 32, NO 2, 536-540
- This study reports the origin of the electrochemical improvement of LiFePO4 when synthesized by wet milling using
acetone without conventional carbon coating. The wet milled LiFePO4 delivers 149 mAhg‒1 at 0.1 C, which is comparable
to carbon coated LiFePO4 and approximately 74% higher than that of dry milled LiFePO4, suggesting that the wet
milling process can increase the capacity in addition to conventional carbon coating methods. UV spectroscopy, elemental
microanalysis, and evolved gas analysis are used to find the root cause of the capacity improvement during
the mechanochemical reaction in acetone. The analytical results show that the improvement is attributed to the conductive
residual carbon on the surface of the wet milled LiFePO4 particles, which is produced by the reaction of FeC2O4·2H2O with acetone during wet milling through oxygen deficiency in the precursor.
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