首页|High-efficiently doping nitrogen in kapok fiber-derived hard carbon used as anode materials for boosting rate performance of sodium-ion batteries

High-efficiently doping nitrogen in kapok fiber-derived hard carbon used as anode materials for boosting rate performance of sodium-ion batteries

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
The engineering of plant-based precursor for nitrogen doping has become one of the most promising strategies to enhance rate capability of hard carbon materials for sodium-ion batteries;however,the poor rate performance is mainly caused by lack of pyridine nitrogen,which often tends to escape because of high temperature in preparation process of hard carbon.In this paper,a high-rate kapok fiber-derived hard carbon is fabricated by cross-linking carboxyl group in 2,6-pyridinedicarboxylic acid with the exposed hydroxyl group on alkalized kapok with assistance of zinc chloride.Specially,a high nitrogen doping content of 4.24％is achieved,most of which are pyridine nitrogen;this is crucial for improving the defect sites and electronic conductivity of hard carbon.The optimized carbon with feature of high nitrogen content,abundant functional groups,degree of disorder,and large layer spacing exhibits high capacity of 401.7 mAh g-1 at a current density of 0.05 A g-1,and more importantly,good rate perfor-mance,for example,even at the current density of 2 A g-1,a specific capacity of 159.5 mAh g-1 can be obtained.These findings make plant-based hard carbon a promising candidate for commercial applica-tion of sodium-ion batteries,achieving high-rate performance with the enhanced pre-cross-linking inter-action between plant precursors and dopants to optimize aromatization process by auxiliary pyrolysis.

Kapok fiberHard carbonElectrode materialsRate performanceSodium-ion batteries

Tianyun Zhang、Tian Zhang、Fujuan Wang、Fen Ran

展开 >

School of Mechanical and Electronical Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China

State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730500,Gansu,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaChina Postdoctoral Science FoundationLanzhou Young Science and Technology Talent Innovation ProjectProgram for Hongliu Excellent and Distinguished Young Scholars at Lanzhou University of Technology

51903113520731332022T1502822023-QN-101

2024

10.1016/j.jechem.2024.05.005

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.96(9)