Chemical Industry and Engineering Progress ›› 2024, Vol. 43 ›› Issue (6): 3209-3220.DOI: 10.16085/j.issn.1000-6613.2023-0753

• Materials science and technology • Previous Articles    

Preparation of B-doped porous carbon nanosheets and their lithium storage performance

SUN Yue1(), XING Baolin1,2(), ZHANG Yaojie1, FENG Laihong3, ZENG Huihui1, JIANG Zhendong1, XU Bing1, JIA Jianbo1, ZHANG Chuanxiang1,2, CHEN Lunjian1, ZHANG Yue1, ZHANG Wenhao1   

  1. 1.College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China
    2.State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Jiaozuo 454000, Henan, China
    3.Huaneng Coal Technology Research Co. , Ltd. , Beijing 100071, China
  • Received:2023-05-08 Revised:2023-08-11 Online:2024-07-02 Published:2024-06-15
  • Contact: XING Baolin

B掺杂多孔碳纳米片的制备及其储锂性能

孙悦1(), 邢宝林1,2(), 张耀杰1, 冯来宏3, 曾会会1, 蒋振东1, 徐冰1, 贾建波1, 张传祥1,2, 谌伦建1, 张越1, 张文豪1   

  1. 1.河南理工大学化学化工学院,河南 焦作 454000
    2.煤炭安全生产与清洁高效利用省部共建协同创新中心,河南 焦作 454000
    3.华能煤炭技术研究有限公司,北京 100071
  • 通讯作者: 邢宝林
  • 作者简介:孙悦(1992—),女,博士研究生,研究方向为矿产资源加工利用。E-mail:1509047307@qq.com
  • 基金资助:
    国家自然科学基金(52274261);国家级大学生创新创业训练计划(202110460011)

Abstract:

Anode materials are one of the critical factors affecting the electrochemical performance of lithium-ion batteries (LIBs). Pore structure modulation and heteroatom doping effectively improve the electrochemical performance of anode materials. In this paper, coal-based carbon nanosheets (CS) were prepared by using lignite as a precursor chemical oxidation method. Then B-doped porous carbon nanosheets (BPCS) were obtained using boron oxide (B2O3) as an additive. The microstructures of CS and BCPS were characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), Raman spectroscopy (Raman), nitrogen adsorption-desorption and X-ray photoelectron spectroscopy (XPS), and the electrochemical properties of CS and BPCS as anode materials for LIBs were investigated. The results showed that B2O3 had triple functions of template, pore-making and doping. When the dosage of B2O3 was 0.5g, BPCS-0.5 exhibited a three-dimensional porous structure with a specific surface area of 1216.20m2/g, a total pore volume of 1.027cm3/g, and content of B atom of 4.20%. The porous structure of BPCS-0.5 provided sufficient space and channels for ion storage and transport, and the introduction of B element increased the surface chemical activity of BPCS, which enhanced the lithium storage performance. When BPCS-0.5 as anode material of LIBs, the first reversible capacity reached 826mA·h/g at a current density of 0.05A/g and the reversible capacity still reached 143mA·h/g at a high current density of 5A/g, and the capacity retention rate of 500 cycles was 172%, indicating that the anode materials had high lithium storage capacity and excellent cycle life.

Key words: lignite, boron-doped, porous carbon nanosheets, lithium-ion batteries, electrochemical performance

摘要:

负极材料是影响锂离子电池(LIBs)性能的关键因素之一,孔隙结构调控和杂原子掺杂是提高负极材料电化学性能的有效手段。以褐煤为前体,采用化学氧化法制备煤基碳纳米片(CS),再以氧化硼(B2O3)为添加剂,得到B掺杂多孔碳纳米片(BPCS);采用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)、拉曼光谱(Raman)、氮气吸附仪、X射线光电子能谱(XPS)等手段对CS和BPCS微观结构和用作锂离子电池负极材料的电化学性能表征与测试。结果表明,B2O3具有模板、造孔、掺杂三重作用,当B2O3用量为0.5g时,BPCS-0.5呈现三维多孔结构,比表面积为1216.20m2/g,总孔容1.027cm3/g,B原子含量为4.20%;BPCS-0.5的多孔结构为离子的存储和传输提供足够的空间和通道,B元素的引入增加了BPCS的表面化学活性,从而增强了储锂性能。BPCS-0.5用作锂离子电池负极材料时,在0.05A/g电流密度下首次可逆容量达826mA·h/g,且在5A/g大电流密度下可逆容量仍有143mA·h/g,循环500次的容量保持率为172%,表明该材料具有较高的储锂容量和优异的循环寿命。

关键词: 褐煤, B掺杂, 多孔碳纳米片, 锂离子电池, 电化学性能

CLC Number: 

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