VB2因具有超高理论比容量(4060 mAh/g)而成为具有发展潜力的空气电池负极材料.实验以VB2为负极活性物质,Ni为导电剂,NH4HCO3为造孔剂,采用粉末冶金方法制备了大容量VB2-空气电池用多孔负极片,并探讨了负极片孔隙度对负极所组装空气电池放电性能的影响规律.结果表明,所制备的多孔VB2负极片放电性能优异,放电比容量可以达到3216～3463 mAh/g范围内;多孔VB2负极片放电容量、比容量、库伦效率和比能量均与孔隙度密切相关.当添加15wt％NH4HCO3造孔剂时,烧结制备的多孔VB2负极片的孔隙度为60.91％,此时VB2-空气电池放电性能最优:放电容量为7792mAh,放电比容量为3463mAh/g,库伦效率为85.30％,放电比能量为2370mWh/g.
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 rnAh/g,coulombic efficiency of 85.30％,and specific energy of 2370 mWh/g.
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