TY - JOUR
T1 - Polymer and Chaotropic Anion
T2 - A dual-additive strategy enables stable Zn Anode and high energy efficiency for Zn-Air/Iodide hybrid batteries
AU - Zhao, Siyuan
AU - Zhao, Jiayu
AU - Zhang, Wenlan
AU - Yan, Yaping
AU - Ma, Jiachen
AU - Feng, Qinyang
AU - Bello, Idris Temitope
AU - Wei, Manhui
AU - Liu, Tong
AU - Bae, Jinhye
AU - Zhu, Minshen
AU - Ni, Meng
N1 - Publisher Copyright:
© 2024 Elsevier B.V.
PY - 2024/8
Y1 - 2024/8
N2 - The severe Zn dendrite growth and low energy efficiency inhibit the application of Zn-air batteries (ZABs) in energy storage. Electrolyte additives are promising to resolve these issues and improve battery performance. Polyacrylamide (PAM) additive with abundant polar functional groups can theoretically induce a uniform Zn deposition and interacts with water molecules to lower the water activity but suffer from limited effect in practice due to low solubility. Concurrently, chaotropic anion I- with a lower oxidation potential is also introduced to substitute the sluggish oxygen evolution reaction (OER) with a faster iodide oxidation reaction (IOR) during charging, contributing to a Zn-air/iodide hybrid battery with enhanced energy efficiency. However, the I- has no effect on Zn dendrite issues. Herein, we develop a dual-additive strategy employing polymer and chaotropic anion simultaneously to take both their advantages but also avoid the drawbacks. I- can facilitate the dissolution and untangling of PAM chains, which enables more functional groups to interact with Zn and water molecules. Thanks to the synergetic effect of PAM and I-, the hybrid ZAB delivers a long cycle life of 240 h with a high energy efficiency of 74.6 % and obtains a stable Zn anode with alleviated dendrite growth and improved utilization rate. Moreover, the rapid IOR process enables stable battery operation at -20 °C, further broadening the application scenarios of ZABs.
AB - The severe Zn dendrite growth and low energy efficiency inhibit the application of Zn-air batteries (ZABs) in energy storage. Electrolyte additives are promising to resolve these issues and improve battery performance. Polyacrylamide (PAM) additive with abundant polar functional groups can theoretically induce a uniform Zn deposition and interacts with water molecules to lower the water activity but suffer from limited effect in practice due to low solubility. Concurrently, chaotropic anion I- with a lower oxidation potential is also introduced to substitute the sluggish oxygen evolution reaction (OER) with a faster iodide oxidation reaction (IOR) during charging, contributing to a Zn-air/iodide hybrid battery with enhanced energy efficiency. However, the I- has no effect on Zn dendrite issues. Herein, we develop a dual-additive strategy employing polymer and chaotropic anion simultaneously to take both their advantages but also avoid the drawbacks. I- can facilitate the dissolution and untangling of PAM chains, which enables more functional groups to interact with Zn and water molecules. Thanks to the synergetic effect of PAM and I-, the hybrid ZAB delivers a long cycle life of 240 h with a high energy efficiency of 74.6 % and obtains a stable Zn anode with alleviated dendrite growth and improved utilization rate. Moreover, the rapid IOR process enables stable battery operation at -20 °C, further broadening the application scenarios of ZABs.
KW - Electrolyte additive
KW - Energy efficiency
KW - Salting-in
KW - Zn anode
KW - Zn-air battery
UR - http://www.scopus.com/inward/record.url?scp=85198239499&partnerID=8YFLogxK
U2 - 10.1016/j.ensm.2024.103630
DO - 10.1016/j.ensm.2024.103630
M3 - Journal article
AN - SCOPUS:85198239499
SN - 2405-8297
VL - 71
JO - Energy Storage Materials
JF - Energy Storage Materials
M1 - 103630
ER -