Multifunctional SEI-like structure coating stabilizing Zn anodes at a large current and capacity
Multifunctional SEI-like structure coating stabilizing Zn anodes at a large current and capacity
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DOI：
10.1039/d2ee02931f
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发表时间：
2022-11-30
影响因子：
32.5
通讯作者：
Zhang, Naiqing
中科院分区：
文献类型：
--
作者：
Chen, Aosai;Zhao, Chenyang;Zhang, Naiqing
水溶液锌离子电池的发展和应用仍面临一些障碍，如枝晶生长和活性水引发的副反应。在此，我们在锌阳极上构建了具有类SEI结构的PVA@ SR-ZnMoO 4多功能涂层（SR是指SO 42-受体）。PVA@SR外层可以赋予涂层一些柔性，同时增强Zn 2+迁移率和分散性。ZnMoO 4内层能有效抑制枝晶生长和副反应。重要的是，可以在无机-有机复合内层中的PVA和ZnMoO 4之间建立快速的Zn 2+迁移路径，确保Zn阳极的高电流操作。由于这种“相互配合”，Zn阳极在5 mA cm（-2）和5 mA h cm（-2）下的库仑效率高达99.42%，循环稳定性达到1700 h。此外，Zn/α-MnO 2全电池在1.0A g（-1）下循环1000次后仍能保持141.7mA h g（-1）的剩余容量而没有容量衰减。
The development and application of aqueous zinc-ion batteries still face some obstacles, such as dendrite growth and side reactions triggered by active water. Here, we constructed a PVA@SR-ZnMoO4 multifunctional coating on the Zn anode with an SEI-like structure (SR refers to SO42- receptor). The PVA@SR outer layer can give the coating some flexibility while enhancing Zn2+ mobility and dispersion. The ZnMoO4 inner layer can effectively inhibit dendrite growth and side reactions. Importantly, a fast Zn2+ migration pathway can be established between PVA and ZnMoO4 in the inorganic-organic composite inner layer, ensuring high-current operation of the Zn anode. Thanks to the "mutual cooperation", the Zn anode exhibits a high Coulomb efficiency (CE) of 99.42% and good cycling stability of 1700 h at 5 mA cm(-2) and 5 mA h cm(-2). Moreover, the Zn/alpha-MnO2 full cell can maintain a residual capacity of 141.7 mA h g(-1) without capacity decay after 1000 cycles at 1.0 A g(-1).