B掺杂多孔碳纳米片的制备及其储锂性能
Preparation of B-doped porous carbon nanosheets and their lithium storage performance
孙悦 1邢宝林 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 2谌伦建 1张越 1张文豪1
作者信息
- 1. 河南理工大学化学化工学院,河南焦作 454000
- 2. 河南理工大学化学化工学院,河南焦作 454000;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
- 折叠
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.
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.
关键词
褐煤/B掺杂/多孔碳纳米片/锂离子电池/电化学性能Key words
lignite/boron-doped/porous carbon nanosheets/lithium-ion batteries/electrochemical performance引用本文复制引用
基金项目
国家自然科学基金(52274261)
国家自然科学基金(52074109)
国家级大学生创新创业训练计划(202110460011)
国家级大学生创新创业训练计划(S202110460065)
出版年
2024
国家科技期刊平台
NSTL
万方数据