In:
Materials Horizons, Royal Society of Chemistry (RSC), Vol. 10, No. 8 ( 2023), p. 3162-3173
Abstract:
The development of high energy density and long cycle lifespan aqueous zinc ion batteries is hindered by the limited cathode materials and serious zinc dendrite growth. In this work, a defect-rich VS 2 cathode material is manufactured by in situ electrochemical defect engineering under high charge cut-off voltage. Owing to the rich abundant vacancies and lattice distortion in the ab plane, the tailored VS 2 can unlock the transport path of Zn 2+ along the c -axis, enabling 3D Zn 2+ transport along both the ab plane and c -axis, and reduce the electrostatic interaction between VS 2 and zinc ions, thus achieving excellent rate capability (332 mA h g −1 and 227.8 mA h g −1 at 1 A g −1 and 20 A g −1 , respectively). The thermally favorable intercalation and 3D rapid transport of Zn 2+ in the defect-rich VS 2 are verified by multiple ex situ characterizations and density functional theory (DFT) calculations. However, the long cycling stability of the Zn-VS 2 battery is still unsatisfactory due to the Zn dendrite issue. It can be found that the introduction of an external magnetic field enables changing the movement of Zn 2+ , suppressing the growth of zinc dendrites, and resulting in enhanced cycling stability from about 90 to 600 h in the Zn||Zn symmetric cell. As a result, a high-performance Zn-VS 2 full cell is realized by operating under a weak magnetic field, which shows an ultralong cycle lifespan with a capacity of 126 mA h g −1 after 7400 cycles at 5 A g −1 , and delivers the highest energy density of 304.7 W h kg −1 and maximum power density of 17.8 kW kg −1 .
Type of Medium:
Online Resource
ISSN:
2051-6347
,
2051-6355
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
2744250-0
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