摘要
用廉价的菠萝蜜核为原料,通过一步碳化法成功制备了高比容量的生物质衍生硬碳,并对其相关电化学性能进行了深入研究。结构表明:1300℃碳化的硬碳在25 mA/g的电流密度下具有334 mAh/g的高可逆比容量,库仑效率为71.4%,在相同的电流密度下,100圈循环后保持303.8 mAh/g的比容量,容量保持率为90.2%;通过研究恒电流间歇滴定技术(GITT)和非原位XRD研究了储钠机理,此硬碳具有0.38 nm的层间距,比表面积适中,并且其储钠机理满足“吸附-插层”模型。这种具有良好电化学性能的硬质碳为开发低价的钠电池阳极材料提供了机会。
Biomass-derived hard carbon owning to the low synthesis cost has attracted wide attention for anode materials of sodium-ion batteries.Herein we propose a high specific capacity hard carbon by the one-step carbonization method using the jackfruit kernels with low-cost as precursors under different sintering temperatures and conduct in-depth research on the correlation electrochemical performance.The results show that the hard carbon carbonized at 1300℃delivers a high reversible specific capacity of 334 mAh/g at a current density of 25 mA/g with a Coulombic efficiency of 71.4%and keeps a specific capacity of 303.8 mAh/g with a capacity retention of 90.2%at the same current density after 100 cycles.The mechanism of sodium storage is investigated by galvanostatic intermittent titration technique(GITT)and non-situ XRD.The results show that the mechanism of sodium storage satisfies the adsorption-intercalation model.Such hard carbon with promising electrochemical properties provides the chance to develop inexpensive sodium anode materials.
作者
王磊
杨程
高彦峰
刘宇
WANG Lei;YANG Cheng;GAO Yanfeng;LIU Yu(Shanghai University,School of Materials Science and Engineering,Shanghai 200444,China;Chinese Academy of Sciences,Shanghai Institute of Ceramics,Shanghai 200050,China)
出处
《广州化学》
CAS
2024年第4期36-41,I0002,共7页
Guangzhou Chemistry
基金
国家自然科学基金(No.52202121)
内蒙古科技计划(No.2021ZD0033)
中国三峡集团项目(No.WWKY-2021-0027)。
关键词
钠离子电池
负极材料
生物质
硬碳
电化学测试
sodium-ion battery
anode material
biomass
hard carbon
electrochemical testing
