Carbonaceous Skin-Optimized Reversibility of Bismuth- and Antimony-Based Selenide as an Ultrastable Anode for Potassium Ion Storage

作者：Yuliang Yang, Suqin Liu, Quanrong Pan, Weiwei Zhu, Jue Wang · 发表于：Industrial & Engineering Chemistry Research · 年份：2024 · DOI：10.1021/acs.iecr.4c00211 · 被引用次数：6 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Advanced battery technologies research

Because of the abundant potassium reserves, low redox potential, and rocking chair mechanism similar to lithium-ion batteries, potassium ion batteries (PIBs) are highly attractive in the field of energy storage. Bi 2 Se 3 is regarded as a desirable anode material for PIBs according to the large interlayer spacing and high theoretical capacity. Nevertheless, the electrochemical properties of Bi 2 Se 3 are restricted by the poor reversibility of conversion reactions and huge volume fluctuation during the insertion and extraction of K + ions. Herein, two-dimensional bismuth- and antimony-based selenide (Bi 1.66 Sb 0.34 Se 3 @C) is designed, with the incorporation of antimony to further elevate the specific capacity and carbonaceous skin to address the issue of irreversibility of conversion reactions. Bi 1.66 Sb 0.34 Se 3 @C achieves an admired potassium storage capability of 483.5 mA h g –1 under 0.1 A g –1, as well as a promising reversible capacity of 289 mA h g –1 at 2 A g –1 . Owing to the robust carbonaceous skin, the reversibility of Bi 1.66 Sb 0.34 Se 3 @C is greatly improved, achieving reserved capacities of 372 mA h g –1 after 150 cycles under 0.2 A g –1 and 253 mA h g –1 at 1500th cycle under 1 A g –1 . The mechanism of the optimized potassium storage performance is explored, and the tactic for achieving an ultrastable conversion-alloy-based anode for PIBs is proposed.