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Three dimensional Ti3C2 MXene nanoribbon frameworks with uniform potassiophilic sites for the dendrite-free potassium metal anodes
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-07-27 , DOI: 10.1039/d0na00515k Haodong Shi 1, 2, 3 , Yanfeng Dong 4 , Shuanghao Zheng 1, 3 , Cong Dong 1, 2, 3 , Zhong-Shuai Wu 1, 3
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-07-27 , DOI: 10.1039/d0na00515k Haodong Shi 1, 2, 3 , Yanfeng Dong 4 , Shuanghao Zheng 1, 3 , Cong Dong 1, 2, 3 , Zhong-Shuai Wu 1, 3
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Potassium (K) metal batteries hold great promise as an advanced electrochemical energy storage system because of their high theoretical capacity and cost efficiency. However, the practical application of K metal anodes has been limited by their poor cycling life caused by dendrite growth and large volume changes during the plating/stripping process. Herein, three-dimensional (3D) alkalized Ti3C2 (a-Ti3C2) MXene nanoribbon frameworks were demonstrated as advanced scaffolds for dendrite-free K metal anodes. Benefiting from the 3D interconnected porous structure for sufficient K accommodation, improved surface area for low local current density, preintercalated K in expanded interlayer spacing, and abundant functional groups as potassiophilic nuleation sites for uniform K plating/stripping, the as-formed a-Ti3C2 frameworks successfully suppressed the K dendrites and volume changes at both high capacity and current density. As a result, the a-Ti3C2 based electrodes exhibited an ultrahigh coulombic efficiency of 99.4% at a current density of 3 mA cm−2 with long lifespan up to 300 cycles, and excellent stability for 700 h even at an ultrahigh plating capacity of 10 mA h cm−2. When matched with K2Ti4O9 cathodes, the resulting a-Ti3C2–K//K2Ti4O9 full batteries offered a greatly enhanced rate capacity of 82.9 mA h g−1 at 500 mA g−1 and an excellent cycling stability with high capacity retention (77.7% after 600 cycles) at 200 mA g−1, demonstrative of the great potential of a-Ti3C2 for advanced K-metal batteries.
中文翻译：
用于无枝晶钾金属阳极的具有均匀亲钾位点的三维 Ti3C2 MXene 纳米带框架
钾（K）金属电池因其高理论容量和成本效率而作为先进的电化学储能系统具有很大的前景。然而，K金属负极的实际应用受到枝晶生长和电镀/剥离过程中体积变化大导致循环寿命差的限制。在此，三维(3D)碱化Ti 3 C 2 (a-Ti 3 C 2) MXene 纳米带框架被证明是用于无枝晶 K 金属阳极的先进支架。受益于 3D 互连多孔结构以提供足够的 K 调节、改善的表面积以实现低局部电流密度、在扩大的层间距中预插入 K 以及丰富的官能团作为均匀 K 电镀/剥离的亲钾成核位点，形成的 a-Ti 3 C 2框架在高容量和电流密度下成功地抑制了K枝晶和体积变化。结果，基于a-Ti 3 C 2的电极在3 mA cm -2的电流密度下表现出99.4%的超高库仑效率。即使在 10 mAh cm -2的超高电镀容量下，也具有长达 300 次循环的长寿命和 700 小时的出色稳定性。当与 K 2 Ti 4 O 9正极匹配时，得到的 a-Ti 3 C 2 –K //K 2 Ti 4 O 9全电池在 500 mA g -1和在 200 mA g -1下具有出色的循环稳定性和高容量保持率（600 次循环后为 77.7%），证明了 a-Ti 3 C 2用于先进 K 金属电池的巨大潜力。
更新日期：2020-09-16
中文翻译：
用于无枝晶钾金属阳极的具有均匀亲钾位点的三维 Ti3C2 MXene 纳米带框架
钾（K）金属电池因其高理论容量和成本效率而作为先进的电化学储能系统具有很大的前景。然而，K金属负极的实际应用受到枝晶生长和电镀/剥离过程中体积变化大导致循环寿命差的限制。在此，三维(3D)碱化Ti 3 C 2 (a-Ti 3 C 2) MXene 纳米带框架被证明是用于无枝晶 K 金属阳极的先进支架。受益于 3D 互连多孔结构以提供足够的 K 调节、改善的表面积以实现低局部电流密度、在扩大的层间距中预插入 K 以及丰富的官能团作为均匀 K 电镀/剥离的亲钾成核位点，形成的 a-Ti 3 C 2框架在高容量和电流密度下成功地抑制了K枝晶和体积变化。结果，基于a-Ti 3 C 2的电极在3 mA cm -2的电流密度下表现出99.4%的超高库仑效率。即使在 10 mAh cm -2的超高电镀容量下，也具有长达 300 次循环的长寿命和 700 小时的出色稳定性。当与 K 2 Ti 4 O 9正极匹配时，得到的 a-Ti 3 C 2 –K //K 2 Ti 4 O 9全电池在 500 mA g -1和在 200 mA g -1下具有出色的循环稳定性和高容量保持率（600 次循环后为 77.7%），证明了 a-Ti 3 C 2用于先进 K 金属电池的巨大潜力。
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