菠萝蜜核衍生硬碳的制备与储钠机理
Preparation of Hard Carbon Derived from Jackfruit Seeds and Its Mechanism of Sodium Storage
王磊 1杨程 2高彦峰 1刘宇2
作者信息
- 1. 上海大学 材料科学与工程学院,上海 200444
- 2. 中国科学院上海硅酸盐研究所,上海 201899
- 折叠
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.
Abstract
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.
关键词
钠离子电池/负极材料/生物质/硬碳/电化学测试Key words
sodium-ion battery/anode material/biomass/hard carbon/electrochemical testing引用本文复制引用
基金项目
国家自然科学基金(52202121)
内蒙古科技计划(2021ZD0033)
中国三峡集团项目(WWKY-2021-0027)
出版年
2024
国家科技期刊平台
NSTL
万方数据