Laver-derived Carbon as an Anode for SIBswith Excellent Electrochemical Performance
Yingjie Zhang, Hongyu Cheng, Jiaming Liu, Xue Li, Ziyi Zhu
Abstract
In this work, laver-derived sheet-like carbon materials (SCMs) with wrinkles were prepared via a simple pyrolysis method at high-temperature. The electrode material has an open morphology and structure, and exhibits excellent electrochemical performance. The SEMs results show that the carbon material exhibits a sheet-like structure, and the surface is rich in groove structures. As determined by BET analysis, the specific surface area (SSA) reaches24 m 2 /g, and the average pore diameter is 5.187 nm. When tested as an anode in sodium-ion batteries(SIBs), the material exhibits a first discharge capacity of 482.8 mAh/g. It also manifests excellent cycle stability. After 100 cycles at a current density of 20 mA/g, the reversible capacity is 261.1 mAh/g, and the capacity retention rate reaches 99.61%. In addition, it has a good-high rate performance, and can achieve a discharge capacity of 199.1 mAh/g at 100 mA/g.