期刊
ADVANCED MATERIALS
卷 33, 期 12, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202007406
关键词
hydrogen evolution suppression; practical‐ level Zn batteries; quantifying hydrogen evolution; solid Zn; (2+)‐ ion conductors; Zn deposition regulation
类别
资金
- National Key RAMP
- D Program of China [2019YFA0705104]
By using a ZnF2 solid ion conductor to isolate Zn metal, the hydrogen evolution in Zn metal batteries has been significantly reduced, leading to improved performance and stability of the batteries.
The hydrogen evolution in Zn metal battery is accurately quantified by in situ battery-gas chromatography-mass analysis. The hydrogen fluxes reach 3.76 mmol h(-1) cm(-2) in a Zn//Zn symmetric cell in each segment, and 7.70 mmol h(-1) cm(-2) in a Zn//MnO2 full cell. Then, a highly electronically insulating (0.11 mS cm(-1)) but highly Zn2+ ion conductive (80.2 mS cm(-1)) ZnF2 solid ion conductor with high Zn2+ transfer number (0.65) is constructed to isolate Zn metal from liquid electrolyte, which not only prohibits over 99.2% parasitic hydrogen evolution but also guides uniform Zn electrodeposition. Precisely quantitated, the Zn@ZnF2//Zn@ZnF2 cell only produces 0.02 mmol h(-1) cm(-2) of hydrogen (0.53% of the Zn//Zn cell). Encouragingly, a high-areal-capacity Zn@ZnF2//MnO2 (approximate to 3.2 mAh cm(-2)) full cell only produces maximum hydrogen flux of 0.06 mmol h(-1) cm(-2) (0.78% of the Zn//Zn cell) at the fully charging state. Meanwhile, Zn@ZnF2//Zn@ZnF2 symmetric cell exhibits excellent stability under ultrahigh current density and areal capacity (10 mA cm(-2), 10 mAh cm(-2)) over 590 h (285 cycles), which far outperforms all reported Zn metal anodes in aqueous systems. In light of the superior Zn@ZnF2 anode, the high-areal-capacity aqueous Zn@ZnF2//MnO2 batteries (approximate to 3.2 mAh cm(-2)) shows remarkable cycling stability over 1000 cycles with 93.63% capacity retained at approximate to 100% Coulombic efficiency.
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