期刊
NANOSCALE ADVANCES
卷 2, 期 9, 页码 4212-4219出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0na00515k
关键词
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资金
- National Key R@D Program of China [2016YBF0100100]
- National Natural Science Foundation of China [51872283, 21805273]
- LiaoNing Revitalization Talents Program [XLYC1807153]
- Liaoning BaiQianWan Talents Program
- Natural Science Foundation of Liaoning Province
- Joint Research Fund Liaoning-Shenyang National Laboratory for Materials Science [20180510038]
- DICP [ZZBS201708, ZZBS201802, I202032]
- DICPQIBEBT [UN201702]
- Dalian National Laboratory For Clean Energy (DNL), CAS
- DNL Cooperation Fund, CAS [DNL180310, DNL180308, DNL201912, DNL201915]
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-Ti(3)C(2)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.
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