Strategy for enhancement of magnesium ion diffusion in a vanadium tetra sulfide-layered structure for rechargeable magnesium batteries

Literature Information

Publication Date 2023-10-25
DOI 10.1039/D3TA04634F
Impact Factor 12.732
Authors

Muhammad Kashif Naseem, Mian Azmat, Changliang Du, Rong Jiang, Hajra, Youqi Zhu, Meishuai Zou, Chuanbao Cao


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Abstract

A theoretically higher volumetric capacity, natural abundance, low cost, dendrite free and ecofriendly rechargeable magnesium battery system (RMBS) is considered to be a promising candidate device for future commercialization. However, low capabilities due to the sluggish diffusion kinetics due to the highly polarized Mg2+ ions of cathodic materials are hindering the potential application of such devices. Considering the key role of diffusive contribution, we conducted systematic research to enhance the diffusion contribution of Mg2+ ions in vanadium tetrasulfide (VS4). Nanosized particles were synthesized to provide additional surface area for Mg2+ ions. The effects of sulfur vacancies due to nickel substitution in the VS4-layered atomic structure were studied theoretically. Subsequently, it was confirmed experimentally that the layered atomic structure of VS4 was further expanded and more stable vacancies were generated after nickel substitution. As a result, enhanced diffusion of Mg2+ up to 59.35% at 0.1 mV s−1 exhibited improved cathodic performance enabling a high-performance RMBS. Moreover, these structural alterations exhibited improved electrochemical properties on a copper current collector, such as 5%Ni–VS4, which displayed a remarkable discharge capacity of 477.9 mA h g−1 at 100 mA g−1 that was sustained for up to 1500 cycles at a current density of 500 mA g−1. Hence, the proposed strategy is an effective way forward to develop an efficient VS4 cathode for an RMBS.

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Journal of Materials Chemistry A

Journal of Materials Chemistry A
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