Novel Ultra-Stable 2D SbBi Alloy Structure with Precise Regulation Ratio Enables Long-Stable Potassium/Lithium-Ion Storage,Advanced Materials

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Novel Ultra-Stable 2D SbBi Alloy Structure with Precise Regulation Ratio Enables Long-Stable Potassium/Lithium-Ion Storage
Advanced Materials ( IF 27.4 ) Pub Date : 2023-12-13 , DOI: 10.1002/adma.202308447
Xi Liu ₁ , Xinying Wang ₁ , Yiru Zhou ₁ , Bingchun Wang ₁ , Ligong Zhao ₂ , He Zheng ₂ , Jianbo Wang ₂ , Junhao Liu ₃ , Jun Liu ₃ , Yunyong Li ₁

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The inferior cycling stabilities or low capacities of 2D Sb or Bi limit their applications in high-capacity and long-stability potassium/lithium-ion batteries (PIBs/LIBs). Therefore, integrating the synergy of high-capacity Sb and high-stability Bi to fabricate 2D binary alloys is an intriguing and challenging endeavor. Herein, a series of novel 2D binary SbBi alloys with different atomic ratios are fabricated using a simple one-step co-replacement method. Among these fabricated alloys, the 2D-Sb_0.6Bi_0.4 anode exhibits high-capacity and ultra-stable potassium and lithium storage performance. Particularly, the 2D-Sb_0.6Bi_0.4 anode has a high-stability capacity of 381.1 mAh g⁻¹ after 500 cycles at 0.2 A g⁻¹ (≈87.8% retention) and an ultra-long-cycling stability of 1000 cycles (0.037% decay per cycle) at 1.0 A g⁻¹ in PIBs. Besides, the superior lithium and potassium storage mechanism is revealed by kinetic analysis, in-situ/ex-situ characterization techniques, and theoretical calculations. This mainly originates from the ultra-stable structure and synergistic interaction within the 2D-binary alloy, which significantly alleviates the volume expansion, enhances K⁺ adsorption energy, and decreases the K⁺ diffusion energy barrier compared to individual 2D-Bi or 2D-Sb. This study verifies a new scalable design strategy for creating 2D binary (even ternary) alloys, offering valuable insights into their fundamental mechanisms in rechargeable batteries.

中文翻译：

具有精确调节比率的新型超稳定二维锑铋合金结构可实现长期稳定的钾/锂离子存储

2D Sb或Bi较差的循环稳定性或低容量限制了它们在高容量和长稳定性钾/锂离子电池（PIB/LIB）中的应用。因此，整合高容量锑和高稳定性铋的协同作用来制造二维二元合金是一项有趣且具有挑战性的工作。在此，使用简单的一步共置换方法制备了一系列具有不同原子比的新型二维二元SbBi合金。在这些制备的合金中，2D-Sb _0.6 Bi _0.4负极表现出高容量和超稳定的钾和锂存储性能。特别是，2D-Sb _0.6 Bi _0.4负极在0.2 A g ^-1下循环500次后具有381.1 mAh g ^-1的高稳定性容量（约87.8%保留率）和1000次循环的超长循环稳定性（0.037 PIB 中 1.0 A g ^-1下的每循环衰减百分比）。此外，通过动力学分析、原位/异位表征技术和理论计算揭示了优越的锂和钾存储机制。这主要源于2D二元合金内部的超稳定结构和协同相互作用，与单独的2D-Bi或2D-Sb相比，显着减轻了体积膨胀，增强了K ⁺吸附能，并降低了K ⁺扩散能垒。这项研究验证了一种用于创建二维二元（甚至三元）合金的新的可扩展设计策略，为可充电电池的基本机制提供了宝贵的见解。

更新日期：2023-12-13

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