In situ construction of active interfaces towards improved high-rate performance of CoSe2
| Autor: | Hongbo Geng, Huilong Dong, Jiajun Wu, Xiaowei Miao, Cheng Chao Li, Yafei Cheng, Xue Ma, Bo Wang |
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| Rok vydání: | 2021 |
| Předmět: |
Battery (electricity)
Materials science Renewable Energy Sustainability and the Environment Sodium chemistry.chemical_element 02 engineering and technology General Chemistry Sodium ion transport 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Cathode 0104 chemical sciences Anode law.invention chemistry Transition metal Chemical engineering law General Materials Science 0210 nano-technology Carbon Power density |
| Zdroj: | Journal of Materials Chemistry A. 9:14582-14592 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/d1ta03280a |
| Popis: | Transition metal selenides as anode materials hold great promise in obtaining outstanding sodium-ion batteries. However, the dramatic volume change of transition metal selenides causing poor rate capacity and inferior cycling performance limits their practical application in sodium ion batteries. In this work, a confined-regulated interfacial engineering strategy for the growth of cobalt selenide nanosheets on ultrathin carbon flakes is reported (denoted as CoSe2-CNS). The strong interfacial interaction between CoSe2 and carbon flakes endows CoSe2-CNS with fast electron/sodium ion transport kinetics and good structural stability, thus delivering superior rate capability (352 mA h g−1 at 10 A g−1) and excellent cycling durability. Furthermore, various ex situ characterization techniques and first-principles calculations have been used to unravel the sodium ion storage mechanism of CoSe2-CNS. Impressively, the CoSe2-CNS//NVPOF full cell, which is assembled by combining the CoSe2-CNS anode with a Na3V2(PO4)2O2F (denoted as NVPOF) cathode, exhibits a high capacity of ∼275 mA h g−1 at 0.1 A g−1. Moreover, the assembled full sodium-ion battery possesses the maximum energy density of 115 W h kg−1 and a peak power density of 9214 W kg−1, making CoSe2-CNS a promising anode material for high-performance sodium-ion batteries. |
| Databáze: | OpenAIRE |
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