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Uniform implantation of ultrafine Cu2S nanoparticles into carbon nanowires for efficient potassium-ion battery anodes
Science China Materials ( IF 6.8 ) Pub Date : 2023-05-06 , DOI: 10.1007/s40843-022-2430-6
Chuannan Zhu , Xuwen Zhao , Yifan Xu , Liping Duan , Ruiqi Tian , Jiaying Liao , Xiaosi Zhou

Owing to their high capacities and abundant resources, transition metal sulfides (TMSs) have been proven attractive anode materials for potassium-ion (K-ion) batteries. Nevertheless, TMSs are usually limited by poor electrical conductivity and large volume expansion, leading to structural instability and inferior battery cyclability. Herein, we significantly alleviated the nanoparticle aggregation and pernicious structural degradation by embedding ultrasmall Cu2S nanoparticles in carbon nanowires (Cu2S@C NWs). The volume change in every NW was effectively accommodated compared with conventional Cu2S particles, dramatically improving morphological integrity and leading to a noticeable enhancement in cycle life. As expected, the Cu2S@C NW anode can deliver a large reversible capacity of 391.1 mA h g−1, an excellent rate capability of 118.1 mA h g−1 at 5 A g−1, and a high-capacity retention of 77.2% after 500 cycles at 2 A g−1. In addition, when the Cu2S@C NW anode was assembled with the KVPO4F/carbon nanotubes (CNTs) cathode to form a K-ion full cell, it showed a good discharge capacity of 110.8 mA h g−1 after 100 cycles at 50 mA g−1. This nanoparticle agglomeration-retardant strategy broadens the horizons for nanoengineering to release the stress induced by potassium (de)intercalation and facilitate the further development of efficient anodes for K-ion batteries.



中文翻译:

将超细 Cu2S 纳米粒子均匀植入碳纳米线用于高效钾离子电池阳极

由于其高容量和丰富的资源,过渡金属硫化物 (TMS) 已被证明是钾离子 (K 离子) 电池的有吸引力的负极材料。然而,TMS 通常受到导电性差和体积膨胀大的限制,导致结构不稳定和电池循环性能差。在此,我们通过在碳纳米线 (Cu 2 S@C NWs) 中嵌入超小 Cu 2 S 纳米粒子,显着减轻了纳米粒子聚集和有害的结构退化。与传统的 Cu 2 S 颗粒相比,每个 NW 的体积变化都得到了有效调节,显着改善了形态完整性并显着提高了循环寿命。正如预期的那样,Cu 2S@C NW 负极可提供 391.1 mA hg -1的大可逆容量,在 5 A g -1时具有 118.1 mA hg -1的出色倍率能力,以及在 2 A 下 500 次循环后 77.2% 的高容量保持率g -1。此外,当Cu 2 S@C NW负极与KVPO 4 F/碳纳米管(CNTs)正极组装形成K离子全电池时,在100次循环后显示出110.8 mA hg -1良好放电容量在 50 毫安·克-1. 这种纳米颗粒阻聚策略拓宽了纳米工程的视野,以释放钾(脱)嵌入引起的应力,并促进钾离子电池高效阳极的进一步发展。

更新日期:2023-05-09
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