Suppressing vanadium dissolution of V2O5via in situ polyethylene glycol intercalation towards ultralong lifetime room/low-temperature zinc-ion batteries
| Autor: | Edison Huixiang Ang, Yuqiang Han, Hongbo Geng, Xiao Li, Huilong Dong, Cheng Chao Li, Chunfa Lin, Chunping Shen, Fenqiang Qi |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Nanoscale. 13:17040-17048 |
| ISSN: | 2040-3372 2040-3364 |
| Popis: | Zinc-ion batteries (ZIBs) are a main focus worldwide for their potential use in large-scale energy storage due to their abundant resources, environmental friendliness, and high safety. However, the cathode materials of ZIBs are limited, requiring a stable host structure and fast Zn2+ channel diffusion. Here, we develop a strategy for the intercalation of polyethylene glycol (PEG) to facilitate Zn2+ intercalation and to suppress the dissolution of vanadium in V2O5. In particular, PEG-V2O5 shows a high capacity of 430 mA h g-1 at a current density of 0.1 A g-1 as well as excellent 100 mA h g-1 specific capacity after 5000 cycles, with a high current density of 10.0 A g-1. A reversible capacity of 81 mA h g-1 can even be achieved with a low temperature of -20 °C at a current density of 2.0 A g-1 after 3500 cycles. The superior electrochemical performance comes from the intercalation of PEG molecules, which can improve kinetic transport and structural stability during the cycling process. The Zn2+ storage mechanism, which provides essential guidelines for the development of high-performance ZIBs, can be found through various ex situ characterization technologies and density functional density calculations. |
| Databáze: | OpenAIRE |
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