Interface coordination regulation of zinc ions for advanced zinc-iodine batteries
Yadong Tian,
Song Chen,
Qianwu Chen,
Siyu Ding,
Kwan San Hui,
Jintao Zhang
Affiliations
Yadong Tian
Key Laboratory for Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
Song Chen
Key Laboratory for Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
Qianwu Chen
Key Laboratory for Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
Siyu Ding
Key Laboratory for Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
Kwan San Hui
School of Engineering, Faculty of Science, University of East Anglia, Norwich NR4 7TJ, United Kingdom
Jintao Zhang
Key Laboratory for Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China; Corresponding author.
Aqueous rechargeable zinc-iodine batteries, as an alternative to lithium-ion batteries (LIBs), deliver the advantages of high theoretical specific capacity, high safety, environmental friendliness, and abundant reserves, making them suitable for large-scale energy storage applications. Nevertheless, unstable Zn anodes would cause a series of symptoms, such as the growth of Zn dendrites and side reactions, which endanger the stability and lifespan of the batteries. Herein, an organic-metal (PAA-Zn) functional film is introduced onto the surface of Zn foil via the coordination of polyacrylic acid and divalent ions to address the above challenges of Zn anodes. The PAA-Zn functional films adjust the uniform distribution of the interfacial electric field, which is advantageous for uniform Zn plating/stripping. Additionally, the abundant oxygen-containing functional groups not only significantly enhance the interfacial hydrophilicity, but also reduce the number of free water molecules reaching the Zn foil surface through the isolation and desolvation effect of functional groups, thus inhibiting corrosion and hydrogen evolution side reactions. As a result, PAA-Zn electrodes exhibited a stable cycling for over 1000 h in symmetrical cells. Most importantly, the Zn-I2 batteries demonstrated a high specific capacity with a retention rate of 89.9 % during 3500 cycles when assembled with PAA-Zn anodes.
