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VO 2 ·0.2H 2 O nanocuboids anchored onto graphene sheets as the cathode material for ultrahigh capacity aqueous zinc ion batteries
Nano Research ( IF 9.9 ) Pub Date : 2020-01-03 , DOI: 10.1007/s12274-019-2603-5
Dedong Jia , Kun Zheng , Ming Song , Hua Tan , Aitang Zhang , Lihua Wang , Lijun Yue , Da Li , Chenwei Li , Jingquan Liu

Abstract

Aqueous Zinc-ion batteries (ZIBs), using zinc negative electrode and aqueous electrolyte, have attracted great attention in energy storage field due to the reliable safety and low-cost. A composite material comprised of VO2·0.2H2O nanocuboids anchored on graphene sheets (VOG) is synthesized through a facile and efficient microwave-assisted solvothermal strategy and is used as aqueous ZIBs cathode material. Owing to the synergistic effects between the high conductivity of graphene sheets and the desirable structural features of VO2·0.2H2O nanocuboids, the VOG electrode has excellent electronic and ionic transport ability, resulting in superior Zn ions storage performance. The Zn/VOG system delivers ultrahigh specific capacity of 423 mAh·g−1 at 0.25 A·g−1 and exhibits good cycling stability of up to 1,000 cycles at 8 A·g−1 with 87% capacity retention. Systematical structural and elemental characterizations confirm that the interlayer space of VO2·0.2H2O nanocuboids can adapt to the reversible Zn ions insertion/extraction. The as-prepared VOG composite is a promising cathode material with remarkable electrochemical performance for low-cost and safe aqueous rechargeable ZIBs.



中文翻译:

VO 2·0.2H 2 O纳米立方体锚固在石墨烯片上,作为超高容量水性锌离子电池的正极材料

摘要

使用锌负极和水电解质的水锌离子电池(ZIBs)由于可靠的安全性和低成本而在储能领域引起了极大的关注。通过一种简便有效的微波辅助溶剂热策略合成了由锚固在石墨烯片上的VO 2 ·0.2H 2 O纳米立方组成的复合材料,并将其用作zib水溶液的阴极材料。由于石墨烯片的高电导率与VO 2 ·0.2H 2的理想结构特征之间的协同作用VOG电极为O型纳米立方,具有出色的电子和离子传输能力,从而具有出色的Zn离子存储性能。Zn / VOG系统在0.25 A·g -1时可提供423 mAh·g -1的超高比容量,并在8 A·g -1时表现出高达1,000次循环的良好循环稳定性,并具有87%的容量保持率。系统结构和元素表征证实VO 2 ·0.2H 2 O纳米立方的层间空间可以适应可逆Zn离子的插入/提取。制备的VOG复合材料是一种有前途的阴极材料,具有出色的电化学性能,可用于低成本和安全的水性可充电ZIB。

更新日期:2020-01-04
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