Boosting Reversibility of Conversion/Alloying Reactions for Sulfur-Rich Antimony-Based Sulfides with Extraordinary Potassium Storage Performance
ACS MATERIALS LETTERS(2022)
摘要
As a new sort of energy storage device, potassium-ion batteries (PIBs) have broad application pros-pects in the post-lithium-ion battery era. Among the massive anode materials for PIBs, Sb-based sulfides have attracted much attention because of their high potassium storage capacity and abundant resources. However, the huge volume expansion, sluggish K+ storage kinetics, and low reaction reversibility hinder their applications. Here we composited commercial Sb2S5 with cobalt-and nitrogen-codoped carbon (CoNC) via a facile ball-milling strategy, making it an efficient anode material for PIBs. The synergistic effect between the catalysis of Co and buffering of the carbon matrix enhances the reversibility of the conversion/alloying reaction, alleviates the volume inflation, and improves the electrochemical kinetics, thus enabling the electrode to exhibit enhanced electrochemical performance. The prepared anode delivers a high reversible specific capacity (468.5 mAh g-1 at 500 mA g-1) and outstanding cycling stability (98% capacity retention after 150 cycles). In situ characterization clarified its potassium storage mechanism, and theoretical calculations revealed the reason for the improved electrochemical performance.
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关键词
sulfides,extraordinary potassium storage performance,conversion/alloying reactions,sulfur-rich,antimony-based
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