Boosting potassium-ion batteries by few-layered composite anodes prepared via solution-triggered one-step shear exfoliation.
Boosting potassium-ion batteries by few-layered composite anodes prepared via solution-triggered one-step shear exfoliation.
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DOI：
10.1038/s41467-018-05786-1
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发表时间：
2018-09-07
影响因子：
16.6
通讯作者：
Liu HK
中科院分区：
文献类型：
--
作者：
Liu Y;Tai Z;Zhang J;Pang WK;Zhang Q;Feng H;Konstantinov K;Guo Z;Liu HK
地球上丰富的钾是可充电电池中锂的有前途的替代品，但钾离子电池的关键限制是其相对较低的容量和较差的循环稳定性。本文采用乙醇/水溶剂中一步高剪切剥离法制备少层硫化锑/碳片复合负极，制备高性能钾离子电池。具有少层结构的硫化锑可以最大限度地减少钾化过程中的体积膨胀，缩短离子传输路径，从而增强倍率性能;而复合材料中的碳片则通过捕获不可避免的副产物元素硫来提供导电性并保持电极循环稳定性。同时，还研究了剥离溶剂对二维硫化锑/碳复合材料制备的影响。结果表明，水通过降低硫化锑[010]方向沿着的扩散势垒促进了硫化锑的剥离，而溶剂中的乙醇作为原位碳化的碳源。开发高性能钾离子电池仍然是一个挑战。在这里，作者表明，通过简单的剥离合成的少层Sb 2S 3/碳复合材料阳极最大限度地减少了在K+离子嵌入（脱嵌）期间的体积变化，具有提高的速率性能和循环能力。
Earth-abundant potassium is a promising alternative to lithium in rechargeable batteries, but a pivotal limitation of potassium-ion batteries is their relatively low capacity and poor cycling stability. Here, a high-performance potassium-ion battery is achieved by employing few-layered antimony sulfide/carbon sheet composite anode fabricated via one-step high-shear exfoliation in ethanol/water solvent. Antimony sulfide with few-layered structure minimizes the volume expansion during potassiation and shortens the ion transport pathways, thus enhancing the rate capability; while carbon sheets in the composite provide electrical conductivity and maintain the electrode cycling stability by trapping the inevitable by-product, elemental sulfur. Meanwhile, the effect of the exfoliation solvent on the fabrication of two-dimensional antimony sulfide/carbon is also investigated. It is found that water facilitates the exfoliation by lower diffusion barrier along the [010] direction of antimony sulfide, while ethanol in the solvent acts as the carbon source for in situ carbonization. Developing high-performance potassium-ion batteries remains a challenge. Here, the authors show that few-layered Sb2S3/carbon composite anode synthesized via simple exfoliation minimizes the volume changes during (de)intercalation of K+ ions with boosted rate performance and cyclability.
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