高能球磨破碎铁掺杂δ-MnO2对其电容提升的机理研究

doi:10.11896/cldb.22010246

材料导报

2022, Vol. 36

Issue (20): 22010246-7 https://doi.org/10.11896/cldb.22010246

新型环境功能材料

高能球磨破碎铁掺杂δ-MnO₂对其电容提升的机理研究

初燕芳¹, 张琳², 谢彬², 严能¹, 何俊杰³, 李靖^3,*

1 云南农业大学资源与环境学院,昆明 650500
2 云南农业大学建筑工程学院,昆明 650500
3 云南农业大学理工学部,昆明 650500

Study on Enhancing Capacitance of Fe-doped δ-MnO₂ by High-energy Ball Milling and Its Mechanism

CHU Yanfang¹, ZHANG Lin², XIE Bin², YAN Neng¹, HE Junjie³, LI Jing^3,*

1 College of Resources and Environment, Yunnan Agricultural University, Kunming 650500, China
2 College of Civil Engineering, Yunnan Agricultural University, Kunming 650500, China
3 Faculty of Science and Technology, Yunnan Agricultural University, Kunming 650500, China

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摘要层状结构的δ-MnO₂有利于离子扩散和电荷存储转移,但电导率差、比表面积小、结构团聚等缺陷限制了其电容性能。本工作提出了一种高效的辅助工艺,该工艺利用球磨的高能机械冲击力改善δ-MnO₂的团聚现象,使得致密片层状结构的δ-MnO₂的粒径显著减小、结构的有序性降低、更多有利于其氧化还原反应快速进行的活性位点被暴露,有利于赝电容和扩散电容的提升。通过研究材料的晶体结构、形貌特征以及元素组成,探究球磨对材料电化学储能的影响机制。电化学测试结果表明,球磨后的δ-MnO₂表现出更优异的电容性能。在电流密度为0.5 A·g^-1时,δ-MnO₂的比电容为237.5 F·g^-1,较未球磨的δ-MnO₂纳米片提高250%;在0.5 A·g^-1的电流密度下循环10 000次,δ-MnO₂仍能保持90.4%的初始电容。通过对球磨前后的 δ-MnO₂电化学性能进行综合评估,证明了球磨辅助处理是提升其电容性能的有效手段。

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	初燕芳
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关键词: δ-MnO₂ 结构团聚活性位点赝电容

Abstract: δ-MnO₂ with layered structure is favorable for ion diffusion and charge storage transfer. However, defects such as poor conductivity, small specific surface area and structure agglomeration, limit its electrochemical performance. This work proposed an efficient auxiliary process, in which the agglomeration phenomenon of δ-MnO₂ was inhibited by the high-energy mechanical impact force of ball milling, making the particle size of δ-MnO₂ with dense block structure significantly reduced, the order of the structure disturbed, and more active sites exposed to facilitate the rapid oxidation-reduction reaction. Thus its constraint capacitance and diffusion capacitance were enhanced. By studying the crystal structure, morphology and elemental composition of materials, the influence mechanism of ball milling on electrochemical energy storage of materials was explored. Electrochemical test results show that δ-MnO₂ after ball milling has better electrochemical performance. When the current density is 0.5 A·g^-1, the specific capacitance is 237.5 F·g^-1, which increases by 250% compared with that of the δ-MnO₂ nanosheets without ball mil-ling. After 10 000 cycles at 0.5 A·g^-1 current density, δ-MnO₂ can still maintain 90.4% of the initial capacitance. The comprehensive evaluation of δ-MnO₂ by cyclic charge-discharge tests shows that the assisted treatment of δ-MnO₂ by ball milling is an effective means to improve its energy storage performance.

Key words: δ-MnO₂ structural agglomeration active site constraint apacitance

发布日期: 2022-10-26

ZTFLH:	TB332
	TM53

基金资助: 国家自然科学基金(12064050);云南省重大科技专项计划项目(202002AE090010)

通讯作者: ^*Li_jing69@ynau.edu.cn

作者简介: 初燕芳,2019年6月、2022年6月于云南农业大学分别获得农学学士学位和硕士学位。在李靖教授和何俊杰副教授的指导下进行研究,目前主要研究领域为二氧化锰电极材料。
李靖,云南农业大学大学水利学院教授、硕士研究生导师。研究方向为生态环境材料的制备、绿色高标准农田的智能化管理等。1991年毕业于成都科技大学,获工学学士学位。以第一作者(通讯)发表高水平论文50余篇,获发明专利软件著作权20余项。

引用本文:

初燕芳, 张琳, 谢彬, 严能, 何俊杰, 李靖. 高能球磨破碎铁掺杂δ-MnO₂对其电容提升的机理研究[J]. 材料导报, 2022, 36(20): 22010246-7.
CHU Yanfang, ZHANG Lin, XIE Bin, YAN Neng, HE Junjie, LI Jing. Study on Enhancing Capacitance of Fe-doped δ-MnO₂ by High-energy Ball Milling and Its Mechanism. Materials Reports, 2022, 36(20): 22010246-7.

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http://www.mater-rep.com/CN/10.11896/cldb.22010246 或 http://www.mater-rep.com/CN/Y2022/V36/I20/22010246

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