| 초록 |
Ni-rich NCM(LiNixCoyMnzO2) is a promising advanced cathode material for lithium-ion batteries (LIBs). However, the high Ni content in the layered structures is associated with poor surface stability, which in turn accelerates the capacity fading of the cell. To improve the interfacial stability of Ni-rich NCM cathode material, we propose poly(thiophene)-based artificial cathode-electrolyte interphase(CEI)-immobilized Ni-rich NCM cathode material, synthesized using a simple spin-coating process. At room-temperature cycling, cells with thiophene-modified NCM811 cathodes exhibit improved cycling. The effectiveness of the artificial CEI layer is evident during high-temperature cycling: cells with 36kDa-NCM811 exhibit a specific capacity retention of 89.4%, whereas those with bare NCM811 exhibit a decrease in the cycling retention capacity (55.1%) at 55°C. Polymers with low molecular weights are preferred because P3HTs with low molecular weight have high a hard phase due to their low Tg. |
