通过无枝晶锌阳极和浓缩电解质实现的先进低成本、高电压、长寿命水系混合钠/锌电池。
Advanced Low-Cost, High-Voltage, Long-Life Aqueous Hybrid Sodium/Zinc Batteries Enabled by a Dendrite-Free Zinc Anode and Concentrated Electrolyte.
机构信息
State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering , Huazhong University of Science and Technology , Wuhan 430074 , P. R. China.
State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering , Huazhong University of Science and Technology , Wuhan 430074 , P. R. China.
出版信息
ACS Appl Mater Interfaces. 2018 Jul 5;10(26):22059-22066. doi: 10.1021/acsami.8b04085. Epub 2018 Jun 19.
Aqueous batteries are promising energy storage systems but are hindered by the limited selection of anodes and narrow electrochemical window to achieve satisfactory cyclability and decent energy density. Here, we design aqueous hybrid Na-Zn batteries by using a carbon-coated Zn (Zn@C) anode, 8 M NaClO + 0.4 M Zn(CFSO) concentrated electrolyte coupled with NASICON-structured cathodes. The Zn@C anode achieves stable Zn stripping/plating and improved kinetics without Zn dendrite formation due to the porous carbon film facilitating homogeneous current distribution and Zn deposition. Furthermore, the concentrated electrolyte offers a large electrochemical window (∼2.5 V) and permits stable cycling of cathodes. As a result, the hybrid batteries exhibit extraordinary performance including high voltage, high energy density (100-150 Wh kg for half battery and 71 Wh kg for full battery), and excellent cycling stability of 1000 cycles.
水系电池是很有前途的储能系统，但受到阳极选择有限和电化学窗口较窄的限制，无法实现令人满意的循环稳定性和较高的能量密度。在这里，我们通过使用碳包覆锌（Zn@C）阳极、8 M NaClO + 0.4 M Zn(CFSO)浓缩电解质和 NASICON 结构的阴极来设计水系混合 Na-Zn 电池。Zn@C 阳极由于多孔碳膜有利于均匀的电流分布和 Zn 沉积，实现了稳定的 Zn 剥离/电镀和动力学性能的提升，而没有 Zn 枝晶的形成。此外，浓缩电解质提供了大的电化学窗口（约 2.5 V），并允许阴极稳定循环。因此，混合电池表现出卓越的性能，包括高电压、高能量密度（半电池为 100-150 Wh kg，全电池为 71 Wh kg）和出色的 1000 次循环稳定性。
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