Controlling Horizontal Growth of Zinc Platelet by OP‐10 Additive for Dendrite‐Free Aqueous Zinc‐Ion Batteries. Issue 9 (4th July 2022)

• Record Type: Journal Article
• Authors: Han, Dong; Sun, Tianjiang; Du, Haihui; Wang, Qiaoran; Zheng, Shibing; Ma, Tao; Tao, Zhanliang
• Is Part Of: Batteries & supercaps. Volume 5:Issue 9(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-07-04
• Subjects: aqueous zinc-ion batteries -- crystal growth orientation -- electrolyte -- OP-10 additive -- small dose; Electrochemistry -- Periodicals; Electrodes -- Periodicals; Electric batteries -- Periodicals; 621.31242
• DOI: 10.1002/batt.202200219
• Languages: English
• ISSNs: 2566-6223

Abstract

Abstract: Rechargeable zinc‐ion batteries based on aqueous electrolytes are advantageous in terms of being environmentally friendly, safe and low cost. However, the problems of zinc dendrites and irreversible by‐products on the Zn metal surface during the charging and discharging processes limit its practical application. Herein, octenyl phenol polyoxyethylene ether‐10 (OP‐10) with an oxygen‐rich chain is used as an electrolyte additive to significantly improve the stability of the Zn anode. With an ultralow addition content of about 0.1 wt %, the OP‐10 can not only promote the uniform deposition of Zn 2+ by adjusting the growth orientation of the (002) crystal plane of Zn but also alleviate side‐reaction on the metal surface. Thus, the Zn//Zn cell is stable for more than 800 hours at 1 mA cm −2, and the Zn//Cu cell has a Coulombic efficiency of up to 99.80 %. Further, the Zn//V2 O5 ⋅ 1.6H2 O battery exhibits outstanding cycle stability over 1000 cycles (maintain 92.12 % at 10 C), which is much superior to pure ZnSO4 electrolyte. OP‐10 not only reduces cost but also increases battery energy density, which is more in line with the modification idea of "small dose and large effect" of additives. Abstract : Zinc‐philic groups of OP‐10 increase the nucleation sites, which can homogenize the transport of Zn 2+ cations toward the electrode surface, making the Zn (002) planes dominant and greatly reduced dendrite growth and by‐product formation.