Synergistic Morphology and Electron Modulation Engineering Enables Cation-Anion Cointercalation and Conversion
Zhiyuan Zha1, Ruinan Chen1, Daohong Zhang1,2
1Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education & Hubei Key Laboratory of Catalysis and Materials Science, Hubei R&D Center of Hyperbranched Polymers Synthesis and Applications, South-Central Minzu University, Wuhan 430074, China.
None:
While bismuth chalcogenides have attracted considerable attention for their quantum topological states and spintronic application, there are few studies on bismuth chalcogenides in the field of ammonium-ion batteries (AIBs). Herein, a dual engineering strategy combines tungsten doping and morphological modulation to unlock Bi2Te3 for AIBs. Density functional theory calculations verify that W doping induces electron delocalization, and Bi vacancies create localized charge accumulation. The electronic recombination enables a reversible cation-anion coinsertion accompanied by a conversion reaction mechanism in W-Bi2-xTe3, which delivers 220 mAh g-1 at 0.3 mA with exceptional cycling stability with over 2500 cycles at 3 A g-1. The constructed aqueous "rocking-chair" AIB based on W-Bi2-xTe3//MnO2 exhibits a large reversible capacity of 156.56 mAh g-1 at 0.15 A g-1 and a long lifespan of 2000 cycles. This work provides a facile electron engineering strategy on topological insulator as advanced anode for a new generation of AIBs.
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