球磨时间对石墨烯复合材料电化学性能的影响

doi:10.19964/j.issn.1006-4990.2022-0135

Abstract

Abstract:

The effects of ball milling time on the microstructure and electrochemical properties of graphene/La₁₅Fe₂Ni₇₁Mn₆B₂Al₂ composites were studied by means of X-ray diffraction（XRD），scanning electron microscope（SEM） and electrochemical workstation.The results showed that the graphene composite hydrogen storage alloys milled for 0~60 min were mainly composed of La₃Ni₁₃B₂，（Fe，Ni） and LaNi₅ phases，and the cell volume of LaNi₅ phase would decrease with the increase of milling time.With the increase of ball milling time from 0 to 60 min，the charge transfer resistance of graphene composite hydrogen storage alloy was firstly decreased and then increased，the exchange current density was firstly increased and then decreased，the hydrogen diffusion coefficient and charge retention were firstly increased and then decreased.When the ball milling time was 40 min，the minimum value of charge transfer resistance and the maximum value of exchange current density，hydrogen diffusion coefficient and charge retention were obtained.In addition，graphene composite hydrogen storage alloys showed relatively high discharge capacity at the same cycle times and ball milling time of 40 min.The suitable milling time of graphene/La₁₅Fe₂Ni₇₁Mn₆B₂Al₂ composite was 40 min，and the hydrogen diffusion coefficient and charge retention were 1.259×10^-8cm²/s and 97.62% respectively，which showed good electrochemical properties.It was mainly related to the fine and uniform powder particles and high crystallinity of the composite.

Key words: ball milling time, graphene, hydrogen storage alloy, microstructure, electrochemical performance

CLC Number:

TG139.7

MA Caifu,YUAN Chuanlai,ZHAO Xueqi. Effect of ball milling time on electrochemical properties of graphene composites[J]. Inorganic Chemicals Industry, 2022, 54(12): 68-73.

Figures/Tables 10

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Table 1

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Table 2

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球磨时间/min	物相	晶胞参数/nm		晶胞体积/nm³
球磨时间/min	物相	a	c	晶胞体积/nm³
0	La₃Ni₁₃B₂	5.101 8	11.072 0	0.250 3
	（Fe，Ni）	2.485 9	3.982 7	0.022 3
	LaNi₅	5.053 8	4.017 0	0.089 8
20	La₃Ni₁₃B₂	5.099 6	11.037 2	0.249 5
	（Fe，Ni）	2.484 6	3.978 8	0.022 3
	LaNi₅	5.061 9	3.962 9	0.089 6
40	La₃Ni₁₃B₂	5.110 2	11.027 0	0.250 1
	（Fe，Ni）	2.483 7	3.980 3	0.022 3
	LaNi₅	5.046 1	4.006 5	0.089 3
60	La₃Ni₁₃B₂	5.099 7	10.962 7	0.247 8
	（Fe，Ni）	2.479 8	3.833 4	0.021 4
	LaNi₅	5.024 4	4.006 3	0.088 6

球磨时间/ min	电荷转移电阻/Ω	交换电流密度/（mA·g^-1）	荷电保持率/%	扩散系数/ （10^-8cm²·s^-1）
0	1.874	15.1	83.77	0.950
20	1.731	16.2	88.64	1.185
40	1.415	19.6	97.62	1.259
60	1.530	18.2	95.87	0.874

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Effect of ball milling time on electrochemical properties of graphene composites

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