氮掺杂冰粉基碳包覆Fe3O4及其储锂性能研究

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中文摘要：碳包覆策略是能有效解决锂离子电池负极用过渡金属氧化物(TMO)材料在充放电过程中体积膨胀/收缩造成的粉化难题的一种有效途径.采用生物基可食用冰粉作为碳源与草酸高铁铵的水凝胶作为前驱物,经一步高温热解制备氮掺杂的冰粉基碳包覆Fe3O4,采用XRD、SEM、TEM、XPS、TGA、拉曼光谱、恒电流充放电测试、循环伏安和电化学阻抗谱等方法对样品的形貌、结构和电化学性能进行研究.结果表明,该方法可快速大量制备氮掺杂碳包覆Fe3O4多孔复合材料(N-C@Fe3O4),通过调整原料配比和热处理条件,获得优异的电化学性能.N-C@Fe3O4-5作为锂离子电池负极材料具有良好的循环稳定性(在0.1 A/g电流密度下循环下80圈保持762.74 mAh/g比容量)和较高的倍率性能.相关机理研究表明N-C@Fe3O4复合材料良好倍率性能主要来源于赝电容容量的贡献.复合材料优异的电化学性能是由于碳包覆能够防止纳米颗粒团聚,提高导电性以及形成稳定的固体电解质界面(SEI)膜.冰粉基碳包覆TMO是一种改善其电化学储锂性能的有效途径,可推广并改善其他锂离子电池氧化物负极的储锂性能.

外文标题：Nitrogen-doped ice jelly powder-based carbon-coated Fe3O4 and its lithium storage performance

外文摘要：The carbon coating strategy is an effective way to solve the pulverization problem caused by the vol-ume expansion/shrinkage of transition metal oxide(TMO)materials for lithium-ion battery anodes during charge and discharge.In this paper,bio-based edible ice jelly powder was used as carbon source and ferric am-monium oxalate hydrogel was used as precursor,and nitrogen-doped ice jelly powder-based carbon-coated Fe3O4 was prepared by one-step high-temperature pyrolysis.The morphology,structure and electrochemical properties of the samples were studied by XRD,SEM,TEM,XPS,TGA,Raman spectroscopy,galvanostatic charge-dis-charge test,cyclic voltammetry and electrochemical impedance spectroscopy.The results show that this method can quickly and massively prepare nitrogen-doped carbon-coated Fe3O4 porous composites(N-C@Fe3O4),and excellent electrochemical performance can be obtained by adjusting the ratio of raw materials and heat treatment conditions.N-C@Fe3O4-5 as a lithium ion battery anode material has good cycle stability(762.74 mAh/g specif-ic capacity after 80 cycles at a current density of 0.1 A/g)and high rate capability.Relevant mechanism studies have shown that the good rate performance of N-C@Fe3O4 composites is mainly due to the contribution of pseudocapacitive capacity.The excellent electrochemical performance of the composite is attributed to the car-bon coating that prevents nanoparticle agglomeration,improves electrical conductivity,and forms a stable solid electrolyte interface(SEI)film.This work shows that ice jelly powder-based carbon-coated TMO is an effective way to improve the electrochemical lithium storage performance of TMO,which can be extended and improved the lithium storage performance of other lithium-ion battery oxide anodes.

外文关键词：

lithium-ion batterymagnetite(Fe3O4)carbon coatingice jelly powder

作者：

隋林秀、俞丽芯、罗城城、胡单单、石津津、李力、孙玉恒、胡兵兵、曹蔚琦、袁小亚

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作者单位：

重庆交通大学材料科学与工程学院,重庆 400074

重庆诺奖二维材料研究院,重庆 400799

重庆交通大学先进功能材料研究所,重庆 400074

关键词：

锂离子电池 Fe3O4 碳包覆冰粉

基金：

国家自然科学基金项目重庆市技术创新与应用发展专项重点项目重庆科委基础科学与前沿技术研究重点项目重庆市研究生导师团队建设项目高端外国专家引进计划重庆市自然科学基金面上项目重庆交通大学研究生科创项目

项目编号：

51402030CSTB2022TIAD-KPX0031cstc2017jcyjBX0028JDDSTD2022006G2022035007L2022NSCQ-MSX11652023S0090

出版年：

2024

DOI：

10.3969/j.issn.1001-9731.2024.01.003

功能材料

重庆材料研究院中国仪器仪表学会仪表材料学会

功能材料

CSTPCD北大核心

影响因子：0.918

ISSN：1001-9731

年,卷(期)：2024.55(1)