期刊
SURFACE & COATINGS TECHNOLOGY
卷 421, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2021.127367
关键词
Rutile TiO2; Porous coating; Zinc anode; Aqueous zinc ion batteries; Energy storage
资金
- National Natural Science Foundation of China [52064013, 51762017]
- Hebei Natural Science Fund for Distinguished Young Scholar [E2019209433]
- Youth Talent Program of Hebei Provincial Department of Education [BJ2018020]
- Graduate Student Innovation Fund of Hebei Province, China [CXZZBS2020141]
The study utilized a simple strategy of TiO2 coating to inhibit the formation of zinc dendrites, resulting in improved performance of aqueous zinc ion batteries. The TiO2 coating reduced voltage hysteresis in Zn-Zn symmetric cells and enhanced cycling performance in Zn-MnO2 full cells.
Rechargeable aqueous zinc ion batteries have attracted significant attention because of their non-toxicity, high theoretical capacity, and low cost. However, many challenges regarding zinc anodes have hindered the development of zinc ion batteries, such as the growth of zinc dendrites, passivation and hydrogen evolution. In this study, a simple strategy based on porous rutile nano-TiO2 coating was used to guide uniform deposition of zinc ions to inhibit the formation of zinc dendrite. The TiO2 coated zinc anode shows excellent electrochemical performance. Therefore, for Zn-Zn symmetric cell, the zinc anode protected by TiO2 coating shows reduced voltage hysteresis (50 mV at 0.4 mA cm(-2)). Moreover, for Zn-MnO2 full cell, the cell with TiO2 coating also shows excellent cycling performance. The discharge capacity of Zn-MnO2 full cell is only 27.69 mAh g(-1) after 500 cycles, while discharge capacity of Zn@TiO2-MnO2 full cell is up to 89.14 mAh g(-1). This excellent electrochemical performance may be attributed to improved wettability of TiO2 coated zinc anode, the uniform deposition of Zn2+ and reduction of Zn dendrites. Overall, this study provides a simple and beneficial strategy for future development of rechargeable aqueous zinc ion batteries.
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