通过调整竹基生物质硬碳粒径提高电解液的渗透,高温煅烧增加其封闭微孔数量,改善竹基生物质硬碳低电压平台储钠容量和钠离子迁移动力学。结果表明,平均粒径为19 μm的竹基生物质硬碳在30 mA/g电流密度下的可逆储钠比容量为374.37 mAh/g,首次库伦效率为76.88%,100次循环后可逆储钠比容量为326.9 mAh/g,在300 mA/g电流密度下容量保持率为91.5%。该研究为精确调节生物质衍生硬碳的微观结构以获得优异的钠离子存储性能提供了一种新的策略。

The permeability of electrolyte is improved by adjusting the particle size of bamboo-based biomass hard carbon,and the number of closed micropores in hard carbon is increased by calcination at high temperature.Therefore,the sodium storage capacity and sodium ion migration kinetics of bamboo-based biomass hard carbon are improved.Results show that the reversible sodium storage capacity of bamboo-based biomass hard carbon with an average particle size of 19 μm is 374.37 mAh·g^-1 at 30 mA·g^-1 of current density,the first coulomb efficiency is 76.85%,the reversible sodium storage capacity is 333.1 mAh·g^-1 after 100 cycles,and the capacity retention rate is 91.5% at 300 mA·g^-1 of current density.This study provides a new strategy for precisely regulating the microstructure of biomass-derived hard carbon to obtain excellent sodium ion storage performance.

邹飞杨(1997-),男,硕士生,研究方向为钠离子电池硬碳负极材料,920028385@qq.com;陈召勇(1974-),男,博士,教授,博士生导师,研究方向为先进电池与材料,通讯联系人,chenzhaoyongcioc@126.com。