Improved Li-ion kinetics of the anode by kneading process of binder for lithium-ion batteries with high energy density
Keemin Park, Seungcheol Myeong, Dongsoo Lee, Hee Eun Yoo, Jaeik Kim, Chanho Kim, Jeongheon Kim, Seho Sun, Jiseok Kwon, Soochan Kim, Kangchun Lee, Chae‐Woong Cho, Ungyu Paik, Taeseup Song
Abstract
The low Li-ion kinetics caused by the high ionic and charge transfer resistance in the dense and thick electrode deteriorates electrochemical properties in lithium-ion batteries (LIBs) with high energy density. Here, we report a kneading process of the carboxymethyl cellulose (CMC) binder to improve Li-ion kinetics in the anode. The kneading process of Na-CMC increases the adsorption amount of Na-CMC on the graphite surface, which improves the dispersibility of the anode slurry. Enhanced dispersibility enables uniform pore distribution in the anode, which improves Li-ion kinetics. Moreover, replacing the Na-CMC with Li-CMC in the kneading process further improves Li-ion kinetics in the anode by reducing the charge transfer activation energy due to the formation of high Li-ion conducting LiF-rich solid-electrolyte interphase layer. The anode employing Li-CMC kneading process exhibits enhanced constant current charging capacity retention and cycling stability compared to those of the pristine anode.