The Free-Standing Alloy Strategy to Improve the Electrochemical Performance of Potassium-Based Dual-Ion Batteries,ACS Energy Letters

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The Free-Standing Alloy Strategy to Improve the Electrochemical Performance of Potassium-Based Dual-Ion Batteries
ACS Energy Letters ( IF 19.3 ) Pub Date : 2021-11-12 , DOI: 10.1021/acsenergylett.1c02092
Chenyang Wei ₁ , Decai Gong ₁ , Donghao Xie ₁ , Yongbing Tang _{1,

2,

3}

Affiliation

Potassium-based dual-ion batteries (PDIBs) have shown good application prospects in large-scale energy storage systems. However, because of the limited theoretical capacity of carbonaceous anodes, the electrochemical performance of PDIBs reported at present is still unsatisfactory. Employing alloy materials as anodes should be a possible way to improve the capacity of PDIBs. Herein, free-standing porous carbon nanowires encapsulated with SnSb nanodots (SnSb@PCNWs) are first applied as the anodes for high-performance PDIBs. The free-standing structure design can reduce the cost and increase the proportion of active materials. Besides, the SnSb nanodots provide high potassium storage capacity, while the porous carbon nanowires can effectively buffer the volume expansion of SnSb nanodots. Consequently, the optimized PDIBs display high capacity of 255.3 mAh g^–1 at 2 C (based on anodes), outstanding rate capability up to 12 C, and good cycling performance for 300 cycles at 10 C, which are the best results of the reported PDIBs.

中文翻译：

提高钾基双离子电池电化学性能的独立合金策略

钾基双离子电池（PDIBs）在大规模储能系统中显示出良好的应用前景。然而，由于碳质负极的理论容量有限，目前报道的PDIBs的电化学性能仍不尽如人意。采用合金材料作为阳极应该是提高 PDIBs 容量的一种可能方法。在此，用 SnSb 纳米点（SnSb@PCNWs）封装的自支撑多孔碳纳米线首先被用作高性能 PDIB 的阳极。独立式结构设计，可降低成本，增加活性物质比例。此外，SnSb 纳米点提供高钾存储能力，而多孔碳纳米线可以有效缓冲 SnSb 纳米点的体积膨胀。因此，优化的 PDIB 显示出 255 的高容量。^–1在 2 C（基于阳极），高达 12 C 的出色倍率性能，以及在 10 C 下 300 次循环的良好循环性能，这是已报道的 PDIB 的最佳结果。

更新日期：2021-12-10

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