CuO Nanoplates for High-Performance Potassium-Ion Batteries
| Autor: | Zhang Zhang, Ke-Jing Huang, Huiqiao Liu, Kangzhe Cao, Qiang-Shan Jing, Wangyang Li, Qingqing Han, Lifang Jiao |
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| Rok vydání: | 2019 |
| Předmět: |
Copper oxide
Materials science Abundance (chemistry) Potassium Diffusion chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Anode Ion Biomaterials chemistry.chemical_compound chemistry Chemical engineering Electrode General Materials Science 0210 nano-technology Current density Biotechnology |
| Zdroj: | Small (Weinheim an der Bergstrasse, Germany). 15(36) |
| ISSN: | 1613-6829 |
| Popis: | Potassium-ion batteries (KIBs) are promising alternatives to lithium-ion batteries because of the abundance and low cost of K. However, an important challenge faced by KIBs is the search for high-capacity materials that can hold large-diameter K ions. Herein, copper oxide (CuO) nanoplates are synthesized as high-performance anode materials for KIBs. CuO nanoplates with a thickness of ≈20 nm afford a large electrode-electrolyte contact interface and short K+ ion diffusion distance. As a consequence, a reversible capacity of 342.5 mAh g-1 is delivered by the as-prepared CuO nanoplate electrode at 0.2 A g-1 . Even after 100 cycles at a high current density of 1.0 A g-1 , the capacity of the electrode remains over 206 mAh g-1 , which is among the best values for KIB anodes reported in the literature. Moreover, a conversion reaction occurs at the CuO anode. Cu nanoparticles form during the first potassiation process and reoxidize to Cu2 O during the depotassiation process. Thereafter, the conversion reaction proceeds between the as-formed Cu2 O and Cu, yielding a reversible theoretical capacity of 374 mAh g-1 . Considering their low cost, easy preparation, and environmental benignity, CuO nanoplates are promising KIB anode materials. |
| Databáze: | OpenAIRE |
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