Nanoporous CaCO3 Coatings Enabled Uniform Zn Stripping/Plating for Long‐Life Zinc Rechargeable Aqueous Batteries. Issue 25 (17th July 2018)

• Record Type: Journal Article
• Authors: Kang, Litao; Cui, Mangwei; Jiang, Fuyi; Gao, Yanfeng; Luo, Hongjie; Liu, Jianjun; Liang, Wei; Zhi, Chunyi
• Is Part Of: Advanced energy materials. Volume 8:Issue 25(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-07-17
• Subjects: dendrites -- metal anodes -- nanoporous -- stripping/plating -- Zn‐based batteries; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201801090
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: Zn‐based batteries are safe, low cost, and environmentally friendly, as well as delivering the highest energy density of all aqueous battery systems. However, the application of Zn‐based batteries is being seriously hindered by the uneven electrostripping/electroplating of Zn on the anodes, which always leads to enlarged polarization (capacity fading) or even cell shorting (low cycling stability). How a porous nano‐CaCO3 coating can guide uniform and position‐selected Zn stripping/plating on the nano‐CaCO3 ‐layer/Zn foil interfaces is reported here. This Zn‐deposition‐guiding ability is mainly ascribed to the porous nature of the nano‐CaCO3 ‐layer, since similar functionality (even though relatively inferior) is also found in Zn foils coated with porous acetylene black or nano‐SiO2 layers. Furthermore, the potential application of this strategy is demonstrated in Zn|ZnSO4 +MnSO4 |CNT/MnO2 rechargeable aqueous batteries. Compared with the ones with bare Zn anodes, the battery with a nano‐CaCO3 ‐coated Zn anode delivers a 42.7% higher discharge capacity (177 vs 124 mAh g −1 at 1 A g −1 ) after 1000 cycles. Abstract : A simple yet highly‐effective nanoporous coating strategy is developed to improve the electrostripping/electroplating stabilities of Zn metal anodes. The nanoporous coatings ensure uniform Zn plating over the entire Zn foil surface by guiding electrolyte flux, and confines the Zn plating reaction to the surface region of the Zn foil, enabling a uniform, bottom‐up Zn plating process.