An Ultrastable Na-Zn Solid-State Hybrid Battery Enabled by a Robust Dual-Cross-linked Polymer Electrolyte

Jiaqi Huang; Xiaowei Chi; Jianhua Yang; Yu Liu

doi:10.1021/acsami.0c01990

An Ultrastable Na-Zn Solid-State Hybrid Battery Enabled by a Robust Dual-Cross-linked Polymer Electrolyte

ACS Appl Mater Interfaces. 2020 Apr 15;12(15):17583-17591. doi: 10.1021/acsami.0c01990. Epub 2020 Mar 31.

Authors

Jiaqi Huang^{1

2}, Xiaowei Chi¹, Jianhua Yang¹, Yu Liu¹

Affiliations

¹ Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
² University of Chinese Academy of Sciences, Beijing 100049, China.

PMID: 32195564
DOI: 10.1021/acsami.0c01990

Abstract

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 Zn²⁺ coexist. The SE shows a high conductivity of 19.74 mS cm^-1. 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 Zn²⁺ cross-linked SA. Based on such a robust electrolyte, a novel hybrid cell is developed by involving Na_0.5FeFe(CN)₆-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 Na_0.5FeFe(CN)₆. Ex situ X-ray photoelectron spectroscopy reveals that the dissolution of Na_0.5FeFe(CN)₆ is highly reduced by 79.5%. It is further noted that the corrosion and dendrites at the Zn²⁺/Zn plating anode are greatly hindered for the robust electrolyte. This work gives a pathway for the development of new aqueous ion batteries.

Keywords: Prussian blue nanocomposite cathode; Zn anode; aqueous battery; dendrite suppression; dual-cross-linked gel solid electrolyte; hybrid Na−Zn battery.