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‘‘Anode-free” Zn/LiFePO4 aqueous batteries boosted by hybrid electrolyte
Jingying Duan,Luofu Min,Mengqian Wu,Ting Yang,Mingming Chen,Chengyang Wang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-
Aqueous rechargeable batteries with Zn as anode directly have become prospective alternatives to conventionallithium-ion batteries. However, the growth of zinc dendrites restricts the practical applicationof Zn anode greatly. In addition, the use of thick zinc foil as anode also increases the total weight of thebattery and impacts the whole energy density. Herein, a kind of ‘‘anode-free” Zn/LiFePO4 battery (zeroexcessZn) is designed to solve such problems, and corresponding electrolyte is optimized to ensurethe electrochemical performance. As a result, ethylene glycol (EG) is added to the aqueous electrolytewith 1.5 M Zn(CF3SO3)2 and 1.5 M LiCF3SO3 as solutes, which not only improves the stability of the electrolyte,but also inhibits the growth of zinc dendrites. And the Zn/Cu batteries with 70 vol% EG/H2Ohybrid electrolyte show highly reversible Zn plating/stripping process, in which the average coulombicefficiency (ACE) is as high as 99.77 % at a current density of 1 mA cm2. In order to better adapt to the‘‘anode-free” Zn/LiFePO4 battery system, the ratio of Zn2+ to Li+ ions in this electrolyte is further optimized,and it’s found that the battery with 2 M Zn(CF3SO3)2 + 1 M LiCF3SO3-70 vol% EG/H2O electrolyteshows the most excellent electrochemical stability, in which the capacity retention rate is 75.2 % after100 cycles at a current density of 1 mA cm2. Our work makes it possible for the application of aqueous‘‘anode-free” batteries.
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