Enhancing Magnesium-Ion Storage in a Bi-Sn Anode through Dual-Phase Engineering.

ABSTRACT: Magnesium-ion batteries (MIBs) are a "beyond Li-ion" technology that are hampered by Mg metal reactivity, which motivates the development of anode materials such as tin (Sn) with high theoretical capacity (903 mAh g^-1). However, pure Sn is inactive for Mg²⁺ storage. Herein, Mg alloying with Sn is enabled within dual-phase Bi-Sn anodes, where the optimal composition (Bi_66.5Sn_33.5) outperformed single-phase Bi and Sn electrodes to deliver high specific capacity (462 mAh g^-1 at 100 mA g^-1), good cycle life (84% after 200 cycles), and significantly improved rate capability (403 mAh g^-1 at 1000 mA g^-1). Density functional theory (DFT) calculations revealed that Mg alloys first with Bi and the subsequent form

SUBMITTER: Rashad M 

PROVIDER: S-EPMC11492170 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature