CIESC Journal ›› 2022, Vol. 73 ›› Issue (10): 4745-4753.DOI: 10.11949/0438-1157.20220473

• Material science and engineering, nanotechnology • Previous Articles     Next Articles

Preparation of coal-based porous carbon nanosheets by molten salt strategy as anodes for sodium-ion batteries

Boyang REN1,2(), Xiaogang CHE1(), Siyu LIU1, Man WANG1, Xinghua HAN2(), Ting DONG2, Juan YANG1()   

  1. 1.School of Chemical Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China
    2.School of Chemical Engineering, North University of China, Taiyuan 030000, Shanxi, China
  • Received:2022-04-01 Revised:2022-07-12 Online:2022-11-02 Published:2022-10-05
  • Contact: Xinghua HAN, Juan YANG

熔融盐法制备煤基多孔碳纳米片用于钠离子电池负极

任博阳1,2(), 车晓刚1(), 刘思宇1, 王满1, 韩兴华2(), 董婷2, 杨卷1()   

  1. 1.西安交通大学化工学院,陕西 西安 710049
    2.中北大学化工学院,山西 太原 030000
  • 通讯作者: 韩兴华,杨卷
  • 作者简介:任博阳(1996—),男,硕士研究生,1433783163@qq.com
    车晓刚(1996—),男,硕士研究生,13115063021@163.com
  • 基金资助:
    国家自然科学基金项目(51802251);国家重点研发计划项目(2018YFB0604604)

Abstract:

The development of low-cost anodes with high charge-storage performance for sodium-ion batteries is the key to its commercialization. Herein, two-dimensional porous carbon nanosheets (CTx) were controllably prepared using coal liquefaction residue with rich aromatic frameworks as carbon precursors by taking advantage of KCl/CaCl2 molten salt, and their electrochemical performance as the anodes for sodium-ion batteries was further explored. It was found that the microstructure of coal-based CTx could be optimized by regulating the carbonization temperature, and the as-obtained sample at 1000℃ (CT1000) exhibits a high specific surface area and abundant defect structure. Therefore, a high reversible specific capacity of 221.4 mAh·g-1 was achieved at a current density of 0.1 A·g-1 as the anodes for sodium-ion batteries, and the specific capacity could be maintained at 124.4 mAh·g-1 when the current density was increased to 10 A·g-1, demonstrating excellent rate performance. Furthermore, the CT1000 electrode delivers good cycling stability with a specific capacity retention of 94.2% after 2000 cycles at a current density of 1 A·g-1.

Key words: sodium-ion batteries, coal-based residue, molten salt, porous carbon nanosheets, electrochemical performance

摘要:

低成本、高性能钠离子电池负极材料的开发是其走向商业化应用的关键。以富含芳香结构单元的煤液化固体残渣为碳源,结合KCl/CaCl2熔融盐的结构导向作用,可控制备了二维多孔碳纳米片(carbon nanosheets, CTx),并探究其用于钠离子电池负极材料的电化学性能。研究发现,通过调控碳化温度可对煤基多孔碳纳米片的微观结构进行优化,在1000℃下制备的二维碳纳米片样品(CT1000)具有相对高的比表面积和丰富的缺陷结构。作为钠离子电池的负极材料,在0.1 A·g-1 的电流密度下,其可逆比容量为221.4 mAh·g-1,当电流密度增加至10 A·g-1时,比容量可以保持在124.4 mAh·g-1,倍率性能优异。此外,在1 A·g-1 的电流密度下经2000次循环后,比容量保持率高达94.2%,展现出较大的应用潜力。

关键词: 钠离子电池, 煤基固体残渣, 熔融盐, 多孔碳纳米片, 电化学性能

CLC Number: