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>V2O5/NaV6O15 nanocomposites synthesized by molten salt method as a high-performances cathode material for aqueous zinc-ion batteries
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V2O5/NaV6O15 nanocomposites synthesized by molten salt method as a high-performances cathode material for aqueous zinc-ion batteries
Aqueous zinc-ion batteries (ZIBs) is a potential energy storage system due to its advantages of low cost, good safety, and high theoretical capacity (820 mAh g(-1)). However, the lack of cathode materials with long cycle stability severely restricts the development of ZIBs. In this paper, V2O5/ NaV6O15 nanocomposites are synthesized by molten salt method in one step and used as cathode material for ZIBs, which have good electrochemical performances. The specific capacity of the materials remain 160 mAh g(-1) when the current density is 0.5 A g(-1) after 1000 cycles, and the capacity retention rate is 102.03 when the current density is 5 A g(-1) for 1000 cycles. This is mainly due to the large number of active sites generated by crystal defects and the synergistic interaction between the dual-phase materials, which reduces the stress of ions inserted/extracted during the Zn2+ storage process and improves the electrochemical performance.
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机译:水系锌离子电池(ZIBs)具有成本低、安全性好、理论容量高(820 mAh g(-1))等优点,是一种潜在的储能系统。然而,缺乏具有长循环稳定性的正极材料严重制约了ZIBs的发展。本文采用熔盐法一步合成了V2O5/NaV6O15纳米复合材料,并作为ZIBs的正极材料,具有良好的电化学性能。循环1000次后,当电流密度为0.5 A g(-1)时,材料的比容量保持在160 mAh g(-1),当电流密度为5 A g(-1)时,材料的容量保持率为102.03%,持续1000次。这主要是由于晶体缺陷产生的大量活性位点以及双相材料之间的协同相互作用,降低了Zn2+存储过程中插入/提取离子的应力,提高了电化学性能。
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