Huang Jiaqi, Chi Xiaowei, Yang Jianhua, Liu Yu
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
ACS Appl Mater Interfaces. 2020 Apr 15;12(15):17583-17591. doi: 10.1021/acsami.0c01990. Epub 2020 Mar 31.
This work proposes a dual-cross-linked gel solid electrolyte (SE), here defined as Zn-re-inforced sodium alginate-polyacrylamide SE (Zn-reinforced SA-PAM SE), in which Na and Zn coexist. The SE shows a high conductivity of 19.74 mS cm. Compared to the pure PAM gel, the tensile strength and compressive strength of Zn-reinforced SA-PAM SE are significantly enhanced to be 674.28 kPa and 16.29 MPa, respectively, because of the strengthening mechanism of Zn cross-linked SA. Based on such a robust electrolyte, a novel hybrid cell is developed by involving NaFeFe(CN)-carbon nanotube composites (PB@CNT) as the Na intercalation-type cathode and metallic Zn as the plating anode. The hybrid cell shows an extremely high stability for 10,000 cycles with a record little capacity loss of 0.0027% per cycle, as Zn-reinforced SA-PAM SE successfully inhibits free water molecules from occupying low-spinning metallic sites (Fe-C) in NaFeFe(CN). Ex situ X-ray photoelectron spectroscopy reveals that the dissolution of NaFeFe(CN) is highly reduced by 79.5%. It is further noted that the corrosion and dendrites at the Zn/Zn plating anode are greatly hindered for the robust electrolyte. This work gives a pathway for the development of new aqueous ion batteries.
本工作提出了一种双交联凝胶固体电解质（SE），在此定义为锌增强海藻酸钠-聚丙烯酰胺SE（Zn增强SA-PAM SE），其中钠和锌共存。该SE显示出19.74 mS cm的高电导率。与纯PAM凝胶相比，由于锌交联SA的增强机制，Zn增强SA-PAM SE的拉伸强度和抗压强度分别显著提高到674.28 kPa和16.29 MPa。基于这种坚固的电解质，通过使用NaFeFe(CN)-碳纳米管复合材料（PB@CNT）作为钠嵌入型阴极和金属锌作为电镀阳极，开发了一种新型混合电池。该混合电池在10000次循环中表现出极高的稳定性，每循环的容量损失仅为创纪录的0.0027%，因为Zn增强SA-PAM SE成功抑制了游离水分子占据NaFeFe(CN)中的低自旋金属位点（Fe-C）。非原位X射线光电子能谱表明，NaFeFe(CN)的溶解率大幅降低了79.5%。进一步注意到，对于这种坚固的电解质，锌/锌电镀阳极处的腐蚀和枝晶生长受到了极大的抑制。这项工作为新型水系离子电池的开发提供了一条途径。
