期刊
CHEMICAL ENGINEERING JOURNAL
卷 420, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129642
关键词
Rechargeable aqueous batteries; Zn metal anode; Nanoporous structure; Locally concentrated electrolyte; Electrochemical reversibility
资金
- Innovation Fund of Wuhan National Laboratory for Optoelectronics of Huazhong University of Science and Technology
- China Postdoctoral Science Foundation [2018M640694, 2020T130223]
- Analytical and Testing Center of Huazhong University of Science and Technology
By accurately controlling the nanopore structure, the aqueous Zn metal electrode can achieve high electrochemical reversibility, showing long-term cycling stability and high Coulombic efficiency, which is more stable than the untreated zinc anode.
Rechargeable aqueous Zn metal batteries are promising for large-scale renewable energy storage. However, the aqueous Zn metal battery chemistry encounters severe irreversibility issues, as manifested by the non-uniform metallic Zn plating and undesired side-reactions of corrosion. Herein, we report a highly-reversible aqueous Zn metal anode with accurately controlled nanopore structure, by which the space charge distribution could be regulated and interface-localized concentrated electrolyte was enabled. Consequently, the nanoporous Zn (npZn) electrode exhibited high electrochemical reversibility for 750 h under the measurement with a combination of electrochemically Zn stripping/plating cycling (1 mA cm-2 and 1 mAh cm-2 for 25 cycles) and resting (50 h), and looping. Moreover, a npZn||NaVO3 cell exhibited a high capacity of 200 mAh g-1 and a long lifespan with considerable capacity retention (76% for 1500 cycles), and high reversibility (Coulombic efficiency of 99.8%), which was more stable than the counterpart with pristine Zn anode (short-circuit after 600 cycles).
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