4.8 Article

Long-Life Aqueous Zn-I2 Battery Enabled by a Low-Cost Multifunctional Zeolite Membrane Separator

Journal

NANO LETTERS
Volume 22, Issue 6, Pages 2538-2546

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c00460

Keywords

aqueous zinc iodide batteries; triiodide/iodide redox couple; zeolite membrane separator; aqueous Zn batteries; long-term cycle performance

Funding

  1. Natural Science Foundation of China [22172133, 21673194, 22179111, 22021001]
  2. Ministry of Science and Technology of China [2021YFA1201900]
  3. Basic Research Program of Tan Kah Kee Innovation Laboratory [RD2021070401]

Ask authors/readers for more resources

The research team developed a membrane material using zeolite molecular sieve to effectively control the diffusion of soluble iodide in zinc iodide batteries. The membrane improved the Coulombic efficiency and reversibility of the battery, while also restraining self-discharge and zinc corrosion. Furthermore, the battery showed excellent cycling stability.
Aqueous zinc iodide (Zn-I-2) batteries are promising large-scale energy-storage devices. However, the uncontrollable diffuse away/shuttle of soluble I-3(-) leads to energy loss (low Coulombic efficiency, CE), and poor reversibility (self-discharge). Herein, we employ an ordered framework window within a zeolite molecular sieve to restrain I-3(-) crossover and prepare zeolite molecular sieve particles into compact, large-scale, and flexible membranes at the engineering level. The as-prepared membrane can confine I-3(-) within the catholyte region and restrain its irreversible escape, which is proved via space-resolution and electrochemical in situ time-resolution Raman technologies. As a result, overcharge/self-discharge and Zn corrosion are effectively controlled by zeolite separator. After replacing the typically used glass fiber separator to a zeolite membrane, the CE of Zn-I-2 battery improves from 78.9 to 98.6% at 0.2 A/g. Besides, after aging at the fully charged state for 5.0 h, self-discharge is restrained and CE is enhanced from 44.0 to 85.65%. Moreover, the Zn-I-2 cell maintains 91.0% capacity over 30,000 cycles at 4.0 A/g.

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