High-Performance Aqueous Zinc-Ion Batteries Enabled by Binder- Free and Ultrathin V2O5-x@Graphene Aerogels with Intercalation Pseudocapacitance

被引:9
作者
Chen, Fuyu [1 ]
Luo, Haoran [2 ]
Li, Meng [2 ]
Zheng, Yujie [2 ]
Zhou, Minquan [1 ]
Gui, Hao [1 ]
Xiang, Yongsheng [1 ]
Xu, Chaohe [3 ]
Li, Xinlu [1 ]
Wang, Ronghua [1 ]
机构
[1] Chongqing Univ, Sch Mat Sci & Engn, Chongqing 400044, Peoples R China
[2] Chongqing Univ, Sch Energy & Power Engn, Chongqing 400044, Peoples R China
[3] Chongqing Univ, Coll Aerosp Engn, Chongqing 400044, Peoples R China
基金
中国国家自然科学基金;
关键词
rechargeable zinc-ion batteries; 3D graphene conductive network; diffusion kinetics; ion-storage mechanism; HYDRATED VANADIUM PENTOXIDE; ENERGY-STORAGE; NANOSHEETS; CATHODE; OXIDE; CAPACITANCE; ELECTRODES; COMPOSITE; CHEMISTRY; V2O5;
D O I
10.1021/acsami.2c14153
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
As a result of the absence of solid-state diffusion limitation, intercalation pseudocapacitance behavior is emerging as an attractive charge-storage mechanism that can greatly facilitate the ion kinetics to boost the rate capability and cycle stability of batteries; however, related research in the field of zinc-ion batteries (ZIBs) is still in the initial stage and only found in limited cathode materials. In this study, a novel V2O5-x@rGO hybrid aerogel consisting of ultrathin V2O5 nanosheets (similar to 1.26 nm) with abundant oxygen vacancies (Vo'') and a three-dimensional (3D) graphene conductive network was specifically designed and used as a freestanding and binder-free electrode for ZIBs. As expected, the ideal microstructure of both the material and the electrode enable fast electron/ion diffusion kinetics of the electrode, which realize a typical intercalation pseudocapacitance behavior as demonstrated by the simulation calculation of cyclic voltammetry (CV), ex situ X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and first-principles density functional theory (DFT) calculation. Thanks to the elimination of solid-state diffusion limitation, the V2O5-x@rGO electrode delivers a high reversible rate capacity of 153.9 mAh g-1 at 15 A g-1 and 90.6% initial capacity retention at 0.5 A g-1 after 1050 cycles in ZIBs. The intercalation pseudocapacitance behavior is also realized in the assembled soft-pack battery, showing promising practical application prospects.
引用
收藏
页码:53677 / 53689
页数:13
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