Chemisorption effect enables high-loading zinc-iodine batteries

He，Jiafeng1; Hong，Hu1; Hu，Sanlue2; Zhao，Xiliang1; Qu，Guangmeng1; Zeng，Lin3; Li，Hongfei1,4

2024

10.1016/j.nanoen.2023.109096

Nano Energy   影响因子和分区

2211-2855

Rechargeable Zn-I batteries featuring intrinsic safety and high energy density demonstrate promising energy storage prospects. However, the poor interface stability of the Zn anode and the undesirable shuttle effect severely hinder the device stability due to the diffusive characteristics of the soluble polyiodides in aqueous media. Here, a synergetic physicochemical strategy that combines physical constraints and chemical absorption was proposed by developing a composite host matrix with a core/porous-sheath structure, which can effectively confine iodine species. Initial I ions bind securely with carboxylated multi-walled carbon nanotubes (c-MCNTs) to form the C–I bonds through chemical interactions. Furthermore, the pore structure of microporous carbon (MPC) not only restricts the iodine species in the pores through physisorption (secondary adsorption) but also facilitates the diffusion of Zn. The as-prepared carbon nanotubes coated with microporous carbon (glucose as the carbon source, and its ratio to CNT is 12:1) can serve as a host material (CNT@MPC12), and adsorb iodide ions to derive CNT@MPC12-I. As a result, the developed aqueous Zn battery with CNT@MPC12-I cathode delivers superior reversible rate capacity (0.35 mA h cm at 20 mA cm) and remarkable cycling performance (12,000 cycles at 10 mA cm). Notably, such cathode can also exhibit an impressive capacity retention of 97% after 8600 cycles, even at an ultrahigh loading mass of 16.05 mg cm. As such, our strategy can be extended to design other metal I batteries with high loading and long-life expectancy.

Aqueous Zn-I2 batteries Carbon nanotube Chemical interaction High mass loading Micropore carbon

SCI ; EI

英语

通讯

2-s2.0-85177602640

Scopus

1.Songshan Lake Materials Laboratory,Dongguan,Guangdong,523808,China
2.Faculty of Materials Science and Energy Engineering/Institute of Technology for Carbon Neutrality,Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen,518055,China
3.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.School of System Design and Intelligent Manufacturing,Southern University of Science and Technology,Shenzhen,518055,China

He，Jiafeng,Hong，Hu,Hu，Sanlue,et al. Chemisorption effect enables high-loading zinc-iodine batteries[J]. Nano Energy,2024,119.

He，Jiafeng.,Hong，Hu.,Hu，Sanlue.,Zhao，Xiliang.,Qu，Guangmeng.,...&Li，Hongfei.(2024).Chemisorption effect enables high-loading zinc-iodine batteries.Nano Energy,119.

He，Jiafeng,et al."Chemisorption effect enables high-loading zinc-iodine batteries".Nano Energy 119(2024).