Journal
NANO ENERGY
Volume 81, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105601
Keywords
In-situ self-transformation; Heterointerface design; Zinc-ion battery; Cathode; Quasi-solid-state
Categories
Funding
- National Natural Science Foundation of China [51874110, 51604089]
- Natural Science Foundation of Heilongjiang Province [QC2018058]
- China Postdoctoral Science Foundation [2016M601431, 2018T110308]
- Heilongjiang Postdoctoral Science Foundation [LBH-Z16056, LBH-TZ1707]
- Australian Research Council [DP160100273, DP200100365]
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In this study, a 3D spongy VO2-graphene precursor was designed for achieving ultra-efficient in-situ self-transformation process to convert VO2 into VOH with integrated water molecules and porous heterogeneous architecture. This strategy resulted in a cathode with high capacity, superior rate performance, and excellent cycling stability over 5000 cycles. The ultra-efficient in-situ self-transformation strategy can pave the way for exploring promising electrode materials for advanced energy storage.
In-situ self-transformation is proved to be an effective strategy to design high-performance cathodes for aqueous zinc-ion batteries (ZIBs). However, the inferior transformation efficiencies during phase transition limit its further application. Herein, a 3D spongy VO2-graphene (VO2-rG) precursor has been designed for achieving the ultra-efficient in-situ self-transformation process from VO2-rG into multifaceted V2O5 center dot nH(2)O-graphene composite (VOH-rG). Benefiting from the highly conductive heterointerfaces, rich reaction sites and numerous ions diffusion channels of VO2-rG, almost 100% VO2 nanobelts are converted into VOH during the first charging with few side reactions, indicating a highly efficient transformation kinetics. This strategy enables structural modulation from micro-nano level to molecular level by integrating pre-inserted H2O molecules and constructing 3D porous heterogeneous architecture into the VOH-rG cathode simultaneously, leading to fast and enduring Zn2+ (de) intercalation kinetics. Consequently, the VOH-rG cathode exhibits high capacity of 466 mA h g(-1) at 0.1 A g(-1), superior rate performance (190 mA h g(-1) even at 20 A g(-1)) and excellent cycling stability with 100% capacity retention over 5000 cycles. Moreover, the assembled VOH-rG//Zn flexible quasi-solid-state batteries also present impressive performance. Such an ultra-efficient in-situ self-transformation strategy would pave a new way to explore promising electrode materials for advanced energy storage.
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