Preparation and Discharge Performance of Porous VB2 Anodes for High Capacity VB2-air Battery

doi:10.15541/jim20160344

Abstract

Abstract:

VB₂ has great potential as an anode material of air batteries due to its high theoretical specific capacity (4060 mAh/g). In present work, the porous anodes for high capacity VB₂-air battery were prepared by using powder metallurgy technology, with VB₂ as the active materials of anodes, Ni as the conductive agents, and NH₄HCO₃ as the space-holder. The effect of porosity on the discharge performances of porous anodes was investigated. The results show that the porous anodes exhibit a good discharge performance with specific capacity up to 3216-3463 mAh/g. The discharge capacity, specific capacity, coulombic efficiency, and specific energy all significantly depend on the porosity of the porous anodes. When the addition of space-holder NH₄HCO₃ is 15wt%, the porous anodes have the porosity of 60.91%, and possess the superior discharge properties with discharge capacity of 7792 mAh, specific capacity of 3463 mAh/g, coulombic efficiency of 85.30%, and specific energy of 2370 mWh/g.

Key words: VB2-air battery, anodes, specific capacity, powder metallurgy

CLC Number:

TQ174

WEI Zhi-Guo, LU Xin, TONG Jian-Bo, PAN Yu, WANG Guo-Qing, QU Xuan-Hui. Preparation and Discharge Performance of Porous VB₂ Anodes for High Capacity VB₂-air Battery[J]. Journal of Inorganic Materials, 2017, 32(2): 122-126.

Figures/Tables 6

Fig. 1 Porosities of porous VB2 anodes with different contents of space-holder

Fig. 2 XRD patterns of Ni powders (a), VB2 powders (b) and as-sintered porous VB2 anodes (c)

Fig. 3 SEM images of porous VB2 anodes added with different contents of space-holder(a) 0; (b) 5wt%; (c) 10wt%; (d) 15wt%; (e) 20wt%; (f) 25wt%

Table 1 Discharge property parameters of VB2-air batteries with different porous anodes

NH₄HCO₃in anodes/ wt%	Porosity/ %	Theoretical capacity/ mAh	Voltage/ V	Capacity/ mAh	Specific capacity/(mAh·g^-1)	Ratio of theoretical capacity	Specific energy/(mWh·g^-1)
0	50.16	9135	0.68	7274	3233	79.63%	2210
5	53.28	9135	0.71	7525	3345	82.38%	2370
10	56.11	9135	0.69	7666	3407	83.92%	2360
15	60.91	9135	0.69	7792	3463	85.30%	2370
20	64.41	9135	0.66	7362	3272	80.59%	2170
25	67.46	9135	0.71	7235	3216	79.20%	2290

Fig. 4 Discharge curves of the VB2-air batteries with different porous VB2 anodes(a) Discharge capacity; (b) Specific capacity and coulombic efficiency

Fig. 5 XRD patterns of porous VB2 anodes with porosity of 60.91%(a) Before discharge; (b) After discharge

References 17

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Preparation and Discharge Performance of Porous VB₂ Anodes for High Capacity VB₂-air Battery

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