高能球磨破碎铁掺杂δ-MnO<sub>2</sub>对其电容提升的机理研究

doi:10.11896/cldb.22010246

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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

Published: Online: 2022-10-26

CLC number:	TB332
	TM53

Fund:National Natural Science Foundation of China (12064050), and Major Science and Technology Project of Yunnan Province (202002AE090010).

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	CHU Yanfang
	ZHANG Lin
	XIE Bin
	YAN Neng
	HE Junjie
	LI Jing

Cite this article:

CHU Yanfang,ZHANG Lin,XIE Bin, et al. Study on Enhancing Capacitance of Fe-doped δ-MnO₂ by High-energy Ball Milling and Its Mechanism[J]. Materials Reports, 2022, 36(20): 22010246-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22010246 OR http://www.mater-rep.com/EN/Y2022/V36/I20/22010246

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