| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| Study on Method to Largely Improve Initial Coulombic Efficiency of Fast Growing Wood Based Hard Carbon for Sodium Ion Battery Anodes |
| WANG Lei1, LIU Shaomian1, FAN Fenglan1,*, HAN Wei2
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1 Department of Chemistry and Chemical Engineering, Hebei Minzu Normal University, Chengde 067000, Hebei, China
2 School of Physics and Electronic Engineering, Hebei Minzu Normal University, Chengde 067000, Hebei, China |
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Abstract As a kind of typical fast growing wood, balsa wood can be used to prepare hard carbon by high temperature carbonization. Although the obtained hard carbon has high specific capacities when using as sodium ion battery anodes, its initial coulombic efficiency (ICE) is just about 70%, which limits it’s further application. In order to increase ICE, the raw balsa wood was impregnated with graphite oxide hydrosol under vacuum and then treated with high temperature. Owing to pores’ covering and co-carbonization with graphite oxide, the specific surface area of balsa wood based hard carbon decreases, the carbon layers in hard carbon shows less interlayer distance and better stacking structure, which increases the ICE of balsa wood based hard carbon to be 86.9% at a current density of 20 mA·g-1 and 96.6% at a current density of 1 A·g-1. Additionally, the hard carbon modified by graphite oxide shows higher specific capacities (about 314 mAh·g-1 at a current density of 0.1 A·g-1, more than 240 mAh·g-1 at 1 A·g-1 after 500 times charge/discharge cycles) than original hard carbon, which has a very good application prospect.
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Published: 10 December 2025
Online: 2025-12-03
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