Highly Reversible and Stable Zn Metal Anode under Wide Temperature Conditions Enabled by Modulating Electrolyte Chemistry
Highly Reversible and Stable Zn Metal Anode under Wide Temperature Conditions Enabled by Modulating Electrolyte Chemistry
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DOI：
10.1016/j.cej.2022.136218
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发表时间：
2022-04
影响因子：
15.1
通讯作者：
Jingyi Zhou;Hao Yuan;Jie-Li Li-Jie-Li-Li-119582047;Wei Wei-Wei;Yanmei Li;Jiawei Wang;Liwei Cheng;Da Zhang;Yang Ding;Da Chen;Hua Wang
中科院分区：
文献类型：
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作者：
Jingyi Zhou;Hao Yuan;Jie-Li Li-Jie-Li-Li-119582047;Wei Wei-Wei;Yanmei Li;Jiawei Wang;Liwei Cheng;Da Zhang;Yang Ding;Da Chen;Hua Wang
水基金属锌电池(ZMBs)有望成为下一代储能材料。然而，锌在低温下严重的枝晶生长，以及锌金属阳极在高温下严重的寄生反应，极大地限制了宽温水溶液ZMBs的发展。通过引入多羟基聚合物(聚乙二醇共溶剂)，解决了锌金属阳极所面临的上述问题，从而实现了水基ZMBs在宽温度(-20~80℃)下的高循环稳定性。在零下温度下，聚乙二醇会吸附在锌表面，导致锌离子均匀沉积，从而抑制枝晶的生长。同时，聚乙二醇水分子之间的相互作用通过扰动氢键降低了自由水的活性，从而抑制了锌阳极在高温下的寄生反应。结果表明，锌||锌对称电池在0.2mA/cm−2at−20℃或1 mA/cm−2at 20°C时的超长循环寿命超过1000h，并在60℃下表现出超过1500mAhcm−2的超高循环容量，优于已报道的ZMBs。此外，锌||PANI@V2O5全电池还在−20°C至80°C范围内表现出优异的电化学性能，显示出巨大的实际应用潜力。
Aqueous Zn metal batteries (ZMBs) are promising for next-generation energy storage. However, the grievous Zn dendrite growth at low temperatures and severe parasitic reactions of Zn metal anode at high temperatures greatly restrict the development of wide-temperature aqueous ZMBs. Herein, the above problems faced by Zn metal anode are solved by introducing a multi-hydroxyl polymer (polyethylene glycol, PEG) cosolvent, and thus high cyclic stability of aqueous ZMBs under wide temperatures (-20 to 80 °C) is achieved. At subzero temperatures, PEG adsorbed on the Zn surface induces uniform deposition of Zn2+, which inhibits dendrite growth. Meanwhile, the interaction between PEG and water molecules diminishes the activity of free water by perturbing hydrogen bonds, which suppresses the parasitic reactions of Zn anode at elevated temperatures. As a result, Zn||Zn symmetric cells achieve an ultralong-term cycling life of over 1000 h at 0.2 mA cm−2at −20 °C or at 1 mA cm−2at 20 °C, and exhibit an ultrahigh cumulative cycling capacity (CCC) of over 1500 mAh cm−2at 60 °C, which is superior to the previously reported ZMBs. Moreover, the Zn||PANI@V2O5full batteries also exhibit excellent electrochemical performance from −20 °C to 80 °C, suggesting great potential for practical applications.