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A seaweed-inspired separator for high performance Zn metal batteries: Boosting kinetics and confining side-reactions

Journal of Energy Chemistry, ISSN: 2095-4956, Vol: 101, Page: 191-200
2025
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Article Description

Uncontrolled dendrite growth, sluggish reaction kinetics, and drastic side reactions on the anode-electrolyte interface are the main obstacles that restrict the application prospect of aqueous zinc-ion batteries. Traditional glass fiber (GF) separator with chemical inertness is almost ineffective in restricting these challenges. Herein, inspired by the ionic enrichment behavior of seaweed plants, a facile biomass species, anionic sodium alginate (SA), is purposely decorated on the commercial GF separator to tackle these issues towards Zn anode. Benefiting from the abundant zincophilic functional groups and superior mechanical strength properties, the as-obtained SA@GF separator could act as ion pump to boost the Zn 2+ transference number (0.68), reduce the de-solvation energy barrier of hydrated Zn 2+, and eliminate the undesired concentration polarization effect, which are verified by experimental tests, theoretical calculations, and finite element simulation, respectively. Based on these efficient modulation mechanisms, the SA@GF separator can synchronously achieve well-aligned Zn deposition and the suppression of parasitic side-reactions. Therefore, the Zn||Zn coin cell integrated with SA@GF separator could yield a prolonged calendar lifespan over 1230 h (1 mA cm −2 and 1 mAh cm −2 ), exhibiting favorable competitiveness with previously reported separator modification strategies. Impressively, the Zn-MnO 2 full and pouch cell assembled with the SA@GF separator also delivered superior cycling stability and rate performance, further verifying its practical application effect. This work provides a new design philosophy to stabilize the Zn anode from the aspect of separator.

Bibliographic Details

Qianzhi Gou; Horan Luo; Long Qu; Feilin Yu; Kaixin Wang; Sida Zhang; Ziga Luogu; Ben Zhang; Yujie Zheng; Bingye Song; John Wang; Meng Li

Elsevier BV

Energy; Chemistry

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