Utilization of surface-induced capacitive behavior: A promising strategy to improve low temperature performance of Li-ion batteries

Graphite anode suffers from tremendous electrochemical performance fading at low temperature. To investigate the reason of this fading at low temperature from Li+ storage mechanism perspective, three different carbon structures with various amounts of defect and interlayer spacing are employed in this work, including natural graphite, hard carbon (HC) and mesocarbon microbead (MCMB). The galvanostatic charge/discharge (GCD) tests indicate that amorphous HC electrode shows higher lithiation capacity than graphite and MCMB electrode at -20 degrees C. Cyclic voltammetry tests reveal that higher lithiation capacity of HC electrode mainly stems from the surface-induced capacitive storage mechanism. This work confirms that the utilization of surface-induced capacitive storage mechanism could be considered as a promising strategy to improve the low temperature electrochemical performance. (C) 2022 Elsevier Ltd. All rights reserved.

Automated summary

This study investigates the fading of graphite anode at low temperature from the perspective of Li+ storage mechanism. It is found that the amorphous hard carbon (HC) electrode exhibits higher lithiation capacity than graphite and mesocarbon microbead (MCMB) electrodes at -20 degrees C, primarily due to the surface-induced capacitive storage mechanism. This work highlights the potential of utilizing surface-induced capacitive storage mechanism to improve low temperature electrochemical performance.