Novel Rechargeable M3V2(PO4)3//Zinc (M = Li, Na) Hybrid Aqueous Batteries with Excellent Cycling Performance.
Novel Rechargeable M3V2(PO4)3//Zinc (M = Li, Na) Hybrid Aqueous Batteries with Excellent Cycling Performance.
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具有优异循环性能的新型可充电M3V2(PO4)3//锌（M= Li、Na）混合水电池
DOI：
10.1038/srep25809
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发表时间：
2016-05-12
影响因子：
4.6
通讯作者：
Chen P
中科院分区：
文献类型：
--
作者：
Zhao HB;Hu CJ;Cheng HW;Fang JH;Xie YP;Fang WY;Doan TN;Hoang TK;Xu JQ;Chen P
研究了以nasicon型M3V2(PO4)3 （M = Li, Na）为阴极，金属锌为阳极，在Li2SO4-ZnSO4水溶液中工作的可充电混合水电池（ReHAB）。在0.2C条件下，Li3V2(PO4)3和Na3V2(PO4)3均可实现可逆充放电，初始放电容量分别为128 mAh g - 1和96 mAh g - 1，循环200次后容量保持率高达84%。电化学辅助ex-XRD证实了Li3V2(PO4)3和Na3V2(PO4)3在水溶液中相对稳定，且由于Li+和Na+的共插，Na3V2(PO4)3表现出更为复杂的电化学机理。考察了水溶液pH和Zn枝晶对设计的MVP/Zn rehab循环性能的影响，优化了pH在4.0 ~ 4.5之间的弱酸性水溶液。浮子电流试验证实了所设计的电池在水溶液中是稳定的。由于MVP//Zn ReHABs具有高安全性、快速动态速度和适应性强的电化学窗口，因此可能成为未来可充电水性电池的潜在候选材料。此外，这种混合电池将电池材料的研究范围从涉及单离子扩展到涉及双离子的可充电电池。
A rechargeable hybrid aqueous battery (ReHAB) containing NASICON-type M3V2(PO4)3 (M = Li, Na) as the cathodes and Zinc metal as the anode, working in Li2SO4-ZnSO4 aqueous electrolyte, has been studied. Both of Li3V2(PO4)3 and Na3V2(PO4)3 cathodes can be reversibly charge/discharge with the initial discharge capacity of 128 mAh g−1 and 96 mAh g−1 at 0.2C, respectively, with high up to 84% of capacity retention ratio after 200 cycles. The electrochemical assisted ex-XRD confirm that Li3V2(PO4)3 and Na3V2(PO4)3 are relative stable in aqueous electrolyte, and Na3V2(PO4)3 showed more complicated electrochemical mechanism due to the co-insertion of Li+ and Na+. The effect of pH of aqueous electrolyte and the dendrite of Zn on the cycling performance of as designed MVP/Zn ReHABs were investigated, and weak acidic aqueous electrolyte with pH around 4.0–4.5 was optimized. The float current test confirmed that the designed batteries are stable in aqueous electrolytes. The MVP//Zn ReHABs could be a potential candidate for future rechargeable aqueous battery due to their high safety, fast dynamic speed and adaptable electrochemical window. Moreover, this hybrid battery broadens the scope of battery material research from single-ion-involving to double-ions -involving rechargeable batteries.