Insight into the Superior Lithium Storage Properties of Ultrafine CoO Nanoparticles Confined in a 3 D Bimodal Ordered Mesoporous Carbon CMK‐9 Anode
Diganta Saikia, Juti Rani Deka, Cheng‐Wei Lin, Yuan‐Hung Lai, Yu‐Hao Zeng, Po‐Hung Chen, Hsien‐Ming Kao, Yung‐Chin Yang
Abstract
Abstract Ultrafine CoO particles immobilized into the mesopores of three‐dimensional cubic bimodal ordered mesoporous carbon CMK‐9 is successfully prepared by using a combination of nanocasting and wet‐impregnation methods. It is found that the cubic bimodal interconnected mesoporous framework of CMK‐9 plays a crucial role in achieving the excellent electrochemical performances by assisting the rapid mass and charge transfer. Among the prepared nanocomposites, CoO(10)@CMK‐9 delivers a discharge capacity of 830 mAh g −1 after 200 cycles at a current density of 100 mA g −1 in lithium‐ion batteries. At a higher current density of 1000 mA g −1 , the anode presents an outstanding discharge capacity of 636 mAh g −1 after 200 cycles. In sodium‐ion batteries, the anode provides a discharge capacity of 296 mAh g −1 after 250 cycles at a current density of 100 mA g −1 . The remarkable performances of CoO(10)@CMK‐9 demonstrate the promising potentials of the nanocomposite as the anode for rechargeable batteries.