Ultra-long-life and highly reversible Zn metal anodes enabled by a desolvation and deanionization interface layer
| Autor: | Lei Shi, Jiangxu Li, Kaiwen Qi, Mengke Liu, Yongchun Zhu, Xiaotan Zhang, Dongyan Liu, Tiansheng Zhou, Yitai Qian |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Energy & Environmental Science. 14:3120-3129 |
| ISSN: | 1754-5706 1754-5692 |
| DOI: | 10.1039/d0ee03898a |
| Popis: | The zinc metal anode in aqueous zinc-ion batteries (AZIBs) is considerably impeded by uncontrollable dendrite growth and intricately water-induced corrosion, leading to low Coulombic efficiency (CE) and limited lifespan. Herein, a bifunctional cellulose nanowhisker-graphene (CNG) membrane was constructed to mitigate these problems. Experimental analysis and molecular dynamics simulation reveal that the CNG membrane, functioning as a desolvation layer to preclude H2O molecules encountering the Zn anode, retards the water-induced corrosion reaction. This CNG layer with negative surface charges can simultaneously generate a deanionization shock by spreading cations but screening anions to obtain redirected Zn deposition parallel to the (0002)Zn plane. Furthermore, the flexible and toughened CNG membrane could withstand a strong tensile force (8.54 N) and a great puncture force (0.10 N) to favorably accommodate the Zn anode surface fluctuation during plating/stripping. Accordingly, CNG/Zn anode delivers an enhanced CE (99.4%) and a longer cycle life (∼5500 h), over 27 times that of a bare Zn anode. A full MnO2/graphene-CNG/Zn battery exhibits a high discharge capacity (307 mA h g−1) and maintains a high capacity retention of 87.8% at 5C after 5000 cycles. |
| Databáze: | OpenAIRE |
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