氮硫共掺杂纳米片组装而成的多孔碳微球作为锂/钠离子电池负极材料
Porous carbon microspheres assembled by defective nitrogen and sulfur co-doped nanosheets as anode materials for lithium-/sodium-ion batteries
陈昱天 1由杰 1赵晓冉 1李劢 1韩晓蕾 1刘辉 1孙洪冉 1王晓君 1李慧芳 1王朋 1刘治明1
作者信息
- 1. College of Electromechanical Engineering,Shandong Engineering Laboratory for Preparation and Application of High-performance Carbon-Materials,Qingdao University of Science & Technology,Qingdao 266061,China
- 折叠
摘要
碳基负极材料具有成本低、来源广、电导率高、形态易控制等特点,被广泛应用于各种电池储能系统中.然而,目前市售的作为锂/钠离子电池活性材料的负极材料普遍存在体积变化大、倍率性能差的问题.为此,我们根据希夫碱反应原理,通过简单的水热、碳化和刻蚀工艺,合成了由二维纳米片组装而成的N、S共掺杂多孔碳微球(N、S-PCS).N、S-PCS结构是通过从碳骨架中去除Fe7S8纳米颗粒,形成掺杂N、S的多孔微球.因此,通过杂原子掺杂和表面工程,碳材料的微观形貌特征、孔隙结构和导电性能得到了有效优化.正如预期的那样,制备的N、S-PCS电极在锂离子电池和钠离子电池中都表现出优异的电化学性能.对于锂离子电池,在0.1和20 A g-1的条件下,其可逆容量分别达到1045和237 mAh g-1;对于钠离子电池,它显示出良好的循环稳定性,在1 A g-1的条件下循环500次后,容量为157 mAh g-1.实验和理论计算结果证实,N、S共掺杂策略有助于提高负极材料结构稳定性、缩短离子扩散路径和促进反应动力学,从而实现其优异的电化学性能.这项工作对金属离子电池非金属掺杂功能化多孔碳结构的实际应用具有指导意义.
Abstract
Carbon-based anode materials are widely used in various battery energy storage systems due to their low cost,wide source,high conductivity and easy morphology control.However,current commercially available anode materials as active materials for lithium-/sodium-ion batteries generally suffer from large volume changes and poor rate performance.In response,we synthesized defect-rich N,S co-doped two dimensional(2D)nanosheet-assembled porous carbon mi-crospheres(N,S-PCS)via simple hydrothermal,carbonization and etching process based on the principle of Schiff base re-action.The N,S-PCS structure is thus constructed by re-moving Fe7S8 nanoparticles from the carbon skeleton to form porous microspheres with N,S doping.Therefore,the mi-cromorphology characteristic,pore structure and electro-conductivity of carbon materials are effectively optimized via heteroatom doping and surface engineering.As expected,the prepared N,S-PCS electrodes exhibit excellent electrochemical performance in both lithium-ion and sodium-ion batteries.For lithium-ion batteries,it achieves reversible capacities of 1045 and 237 mAh g-1 at 0.1 and 20 A g-1,respectively.For sodium-ion batteries,it shows good cycling stability with a capacity of 157 mAh g-1 after 500 cycles at 1 A g-1.Experi-mental and theoretical calculation results confirm that the N,S co-doping strategies help to improve the structural stability,shorten the ion diffusion paths,and promote the reaction kinetics,thus achieving excellent electrochemical perfor-mance.This work is instructive for the practical application of nonmetal doping functionalized porous carbon structures for metal-ion batteries.
关键词
porous carbon microspheres/element doping/lithium-ion batteries/sodium-ion batteries/electrochemical performanceKey words
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出版年
2024
NETL
NSTL
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