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Rechargeable Aqueous Zn–V2O5 Battery with High Energy Density and Long Cycle Life
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-05-16 00:00:00 , DOI: 10.1021/acsenergylett.8b00565
Ning Zhang 1, 2 , Yang Dong 1 , Ming Jia 1 , Xu Bian 1 , Yuanyuan Wang 1 , Mande Qiu 1 , Jianzhong Xu 1 , Yongchang Liu 2, 3 , Lifang Jiao 2 , Fangyi Cheng 2
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-05-16 00:00:00 , DOI: 10.1021/acsenergylett.8b00565
Ning Zhang 1, 2 , Yang Dong 1 , Ming Jia 1 , Xu Bian 1 , Yuanyuan Wang 1 , Mande Qiu 1 , Jianzhong Xu 1 , Yongchang Liu 2, 3 , Lifang Jiao 2 , Fangyi Cheng 2
Affiliation
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We report an aqueous Zn–V2O5 battery chemistry employing commercial V2O5 cathode, Zn anode, and 3 M Zn(CF3SO3)2 electrolyte. We elucidate the Zn-storage mechanism in the V2O5 cathode to be that hydrated Zn2+ can reversibly (de)intercalate through the layered structure. The function of the co-intercalated H2O is revealed to be shielding the electrostatic interactions between Zn2+ and the host framework, accounting for the enhanced kinetics. In addition, the pristine bulk V2O5 gradually evolves into porous nanosheets upon cycling, providing more active sites for Zn2+ storage and thus rendering an initial capacity increase. As a consequence, a reversible capacity of 470 mAh g–1 at 0.2 A g–1 and a long-term cyclability with 91.1% capacity rentention over 4000 cycles at 5 A g–1 are achieved. The combination of the good battery performance, safety, scalable materials synthesis, and facile cell assembly indicates this aqueous Zn–V2O5 system is promising for stationary grid storage applications.
中文翻译:
高能量密度和长寿命的可充电Zn–V 2 O 5水性电池
我们报告了一种采用商用V 2 O 5阴极,Zn阳极和3 M Zn(CF 3 SO 3)2电解质的Zn-V 2 O 5电池化学方法。我们阐明了V 2 O 5阴极中的Zn储存机理是水合的Zn 2+可以通过层状结构可逆地(脱嵌)。揭示了共嵌入的H 2 O的功能是屏蔽Zn 2+与主体框架之间的静电相互作用,从而增强了动力学。此外,原始大块的V 2 O 5在循环过程中逐渐演变成多孔纳米片,为Zn 2+的存储提供了更多的活性位点,从而使初始容量增加。结果,在0.2 A g –1时可逆容量为470 mAh g –1,在5 A g –1时4000次循环中具有91.1%的容量保留率,具有长期可循环性。良好的电池性能,安全性,可扩展的材料合成以及便捷的电池组装相结合,表明这种Zn–V 2 O 5水溶液系统有望用于固定式网格存储应用。
更新日期:2018-05-16
中文翻译:

高能量密度和长寿命的可充电Zn–V 2 O 5水性电池
我们报告了一种采用商用V 2 O 5阴极,Zn阳极和3 M Zn(CF 3 SO 3)2电解质的Zn-V 2 O 5电池化学方法。我们阐明了V 2 O 5阴极中的Zn储存机理是水合的Zn 2+可以通过层状结构可逆地(脱嵌)。揭示了共嵌入的H 2 O的功能是屏蔽Zn 2+与主体框架之间的静电相互作用,从而增强了动力学。此外,原始大块的V 2 O 5在循环过程中逐渐演变成多孔纳米片,为Zn 2+的存储提供了更多的活性位点,从而使初始容量增加。结果,在0.2 A g –1时可逆容量为470 mAh g –1,在5 A g –1时4000次循环中具有91.1%的容量保留率,具有长期可循环性。良好的电池性能,安全性,可扩展的材料合成以及便捷的电池组装相结合,表明这种Zn–V 2 O 5水溶液系统有望用于固定式网格存储应用。