LFP via Nanoscale Surface Reforming with a Tiny Minimal Amount of Conductivity-Enhancing Material

초록

LiFePO4 (LFP) typically requires a conductive additive to improve its low ion and electron conductivity. In this study, we achieved significant enhancements in Li+ and electron mobility by applying a minimal amount of conductive material through a new coating process. The coin cell demonstrated an excellent capacity of 157.57 mA h g-1 at 0.1 C/25 degrees C, while the pouch cell exhibited excellent long-term cycling stability, maintaining 99.33% capacity after 150 cycles at 1 C/45 degrees C. Compared to pristine LFP, the rate capacities increased by 30%, reaching 130.9 mA h g-1 at 3 C. After 100 cycles, the R CT resistance value decreased by 10% compared to pristine. The uniform coating layer not only improved electronic conductivity but also enhanced the rate performance. DCIR testing of the pouch cell showed a 17.7% reduction in resistance values compared to that of pristine LFP with increasing cycles. This new coating method, using a very small amount of conductive material, forms a uniform coating layer that optimizes electrochemical performance while maintaining the economic benefits of the LFP cathode material.

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