Congratulations to Shuping Li for his research paper " Unveiling low-tortuous effect on electrochemical performance toward ultrathick LiFePO4 electrode with 100 mg cm-2 area loading " accepted by Journal of Power Sources

Abstract

Thick electrodes can significantly increase the energy density and reduce the battery cost. However, the electrochemical performance of thick electrodes is limited by the transport dynamics of lithium ions, resulting in severe polarization and poor electrochemical performance. Here, we studied the construction of low tortuosity thick electrode by freeze-drying method and studied its electrochemical behavior. The results show that low tortuosity can accelerate the transmission of lithium ions, reduce the concentration polarization, and improve the magnification performance. Due to the fast lithium ion transport dynamics, the electrochemical performance of the low tortuosity thick electrode is limited by concentration polarization after the thickness of 125 µm, which is much higher than the 46 µm thickness of the high tortuosity thick electrode. The thick electrode with low tortuosity has a stable positive electrolyte interface, so it has excellent cycling performance. The area capacity of the low tortuosity thick electrode increases linearly with the active material load, which means that the specific capacity is independent of the electrode thickness. This thick electrode with low tortuosity provides a surface capacity of 14.8 mAh cm-2, even at the ultra-high surface load of 99.56 mg cm-2. This work reveals the electrochemical behavior of thick electrodes with low tortuosity and provides guidance for the use of high performance lithium batteries.

https://www.sciencedirect.com/science/article/pii/S0378775321010867?dgcid=coauthor