期刊
CHEMICAL ENGINEERING JOURNAL
卷 430, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.133042
关键词
Anionic 2D Nanosheets; Dendrite-free; Zn metal anode; Co-deposition; Electrolyte additive
资金
- National Natural Science Foundation of China [21805180, 21671131, 11875185]
- China Postdoctoral Science Foundation [2019M661459, 2020M681260]
- Australian Research Council [DP160102627, DP200100365]
Tin sulfide nanosheets as an electrolyte additive can effectively mitigate zinc anode dendrite growth and improve battery performance, providing a new pathway for achieving high-performance zinc metal anodes in aqueous electrolytes.
Metallic Zinc (Zn) has attracted great attention as a promising anode for aqueous batteries owing to its high theoretical capacity, low cost, and high natural abundance. However, Zn anode suffers from a crucial challenge, namely the growth of Zn dendrites, which brings not only a short life span but also severe safety concerns. In this work, we report that anionic tin sulfide nanosheets (TS-Ns) server as electrolyte additive to mitigate the dendrite growth. The negatively charge TS-Ns can attract the positive Zn2+ from the electrolyte through electrostatic interaction and increase the local concentration of Zn2+. Moreover, TS-Ns can co-deposit with Zn2+ at the initial deposition stage and then form an interfacial protection layer around the Zn surface, guiding the uniform deposition of Zn on cycling. The TS-Ns additive endow the Zn anode with excellent performance, reflected by stable cycling for 3700 h in a symmetric cell with a capacity of 0.2 mAh /cm(2) and for 500 cycles in an asymmetric cell with an average coulombic efficiency of 99.6%. These merits bring high capacity and low polarization in Zn parallel to Mno(2) full cells. We believe that TS-Ns additive provides a new pathway to achieve high-performance Zn metal anodes in aqueous electrolytes.
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