Semi-ionic C-F bond inducing fast ion storage and electron transfer in carbon anode for potassium-ion batteries
Source abstract
Abstract
氟(F)杂原子功能化的碳负极可以形成更多的缺陷位点, 从而有效提高钾的存储容量. 然而, 提高电化学性能的机制尚不清楚, 尤其是对何种C-F键深入影响钾储存性能仍缺乏基本认识. 本文报道了一系列F掺杂的碳, 并证明了C-F是半离子键而不是离子键; 碳化温度对缺陷程度有显著影响. 并且, 高比例半离子C-F键诱导的丰富缺陷可以作为活性位点来吸附大量与电容行为相关的钾离子, 不仅有利于长循环寿命, 而且提升了在高电流密度下的倍率容量. 密度泛函理论计算证实半离子C-F键的存在可以提高碳基体对钾离子的吸附能力并同时提高电子电导率, 有利于高容量和倍率. 此外, 通过耦合半离子C-F键和吡啶N键, 钾吸附能和电导率被进一步提升, 这使得半电池实现了优异的容量(245.2 mA h g−1) 和倍率, 并且组装的全电池具有高能量密度(143.9 W h kg−1).
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Research context
OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Supercapacitor Materials and Fabrication
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