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- Title
Cu<sub>12</sub>Sb<sub>4</sub>S<sub>13</sub> Quantum Dots/Few‐Layered Ti<sub>3</sub>C<sub>2</sub> Nanosheets with Enhanced K<sup>+</sup> Diffusion Dynamics for Efficient Potassium Ion Storage.
- Authors
Cao, Yaping; Zhang, Yelong; Chen, Hui; Qin, Shengyu; Zhang, Lanying; Guo, Shaojun; Yang, Huai
- Abstract
Despite the high theoretical specific capacity of transition‐metal disulfides anode for potassium‐ion batteries (PIBs), their development has been greatly hindered by dramatic capacity fading and poor cycle life. Herein, the synthesis of the new composite of Cu12Sb4S13 quantum dots/few‐layered Ti3C2 nanosheets (CAS‐Ti3C2) as advanced anode for boosting the K ion storage is reported. It is found that as‐made CAS‐Ti3C2 show a strong synergistic effect between quantum dots and Ti3C2 nanosheets mainly caused by the formation of the Ti–S bond, which can not only shorten the diffusion path of K+ but also accommodate the serious volumetric variation during the discharge/charge process. As expected, this specially designed CAS‐Ti3C2 anode exhibits a superior reversible specific capacity of 496.7 mAh g−1 at 100 mA g−1 after 200 cycles and 175.6 mAh g−1 at a high current density of 1.0 A g−1 even over 1800 cycles, preceding most of the reported transition‐metal disulfides quantum dots‐based anodes for PIBs. These comprehensive studies reveal that the excellent electrochemical property is attributed to the fast K+ diffusion kinetics and unique transformation and restorage mechanism between K+ with CAS‐Ti3C2 anode.
- Subjects
POTASSIUM ions; NANOSTRUCTURED materials; DIFFUSION kinetics; ANODES; POTASSIUM channels; DISULFIDES; QUANTUM dot synthesis
- Publication
Advanced Functional Materials, 2022, Vol 32, Issue 6, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202108574