Calcium ion pinned vanadium oxide cathode for high-capacity and long-life aqueous rechargeable zinc-ion batteries
- PDF / 3,150,951 Bytes
- 10 Pages / 595.276 x 793.701 pts Page_size
- 80 Downloads / 206 Views
lcium ion pinned vanadium oxide cathode for high-capacity and long-life aqueous rechargeable zinc-ion batteries 1
1
1
1
1
1
Min Du , Feng Zhang , Xiaofei Zhang , Wentao Dong , Yuanhua Sang , Jianjun Wang , 1,2 1* Hong Liu & Shuhua Wang 1 2
State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;
Institute for Advanced Interdisciplinary Research (iAIR), University of Jinan, Jinan 250022, China Received May 21, 2020; accepted July 16, 2020; published online October 22, 2020
Rechargeable aqueous zinc ion batteries (ZIBs), with the easy operation, cost effectiveness, and high safety, are emerging candidates for high-energy wearable/portable energy storage systems. Unfortunately, the unsatisfactory energy density and undesired long-term cycling performance of the cathode hinder the development of ZIBs. Here, we report the chemical preintercalation of a small amount of calcium ions into V2O5 as the cathode material. The cathode of Ca0.04V2O5•1.74H2O (CVO) −1 −1 −1 was demonstrated to have a high specific capacity of 400 mA h g at the current density of 0.05 A g and 187 mA h g at −1 −1 10 A g , along with impressive capacity retention (100% capacity retention at 10 A g for 3,000 cycles). Meanwhile, the CVO// −1 −1 −1 Zn battery exhibits a high energy density of 308 Wh kg and a power density of 467 W kg at 0.5 A g . The superior performance originates from the pinning effect of the calcium ions and the lubricating effect of the structural water. The energy storage mechanism of the CVO cathode was also investigated in detail. The new phase (Zn3(OH)2V2O7•2H2O) generated upon cycling participates in the electrochemical reaction and thus contributes to the excellent electrochemical performance. The small 2+ amount of Ca pre-inserted into the interlayer of V2O5 sheds light on constructing cathodes with high energy density for ZIBs. aqueous zinc-ion battery, ion pre-intercalation, vanadium pentoxide, phase transition, energy storage mechanism Citation:
Du M, Zhang F, Zhang X, Dong W, Sang Y, Wang J, Liu H, Wang S. Calcium ion pinned vanadium oxide cathode for high-capacity and long-life aqueous rechargeable zinc-ion batteries. Sci China Chem, 2020, 63, https://doi.org/10.1007/s11426-020-9830-8
1 Introduction In the effort to realize the utilization of sustainable green energy resources, cost-effectiveness and reliable electrochemical energy storage materials have received considerable attention in recent decades [1,2]. Currently, the portable device market is mainly occupied by lithium-ion batteries because they have high energy density advantages [3,4]. Unfortunately, the further development of lithium-ion batteries in wearable energy storage devices and grid-level storage is constrained by safety concerns and toxic organic electrolytes [5,6]. The emergence of rechargeable aqueous batteries brings new opportunities. They are regarded as *Corresponding author (email: [email protected])
potential candidates because the electrolytes dissolved in water endow batteries with better safety
Data Loading...
