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<p>The instantaneous nucleation of Sn originating from the uncontrolled diffusion of Sn<sup>2+</sup> ions typically forms large, electrochemically inactive “dead Sn” that severely constraints the plating/stripping reversibility of Sn anode for acidic aqueous batteries. Herein, nanoscale spatial confinement of Sn<sup>2+</sup> ions is realized in SnSO<sub>4</sub> electrolyte by strategically dictating spontaneous assembly of nanomicelles with amphipathic sulfolane. The as-constructed locally heterogeneous environment ensures the sustainable release of Sn<sup>2+</sup> ions, which reprograms the nucleation manner from instantaneous to progressive modes. The consequent progressive formation of Sn nuclei triggers size refinement of electrodeposited Sn, thereby alleviating the “dead Sn” issue. Meanwhile, the reaction competitivity of Sn<sup>2+</sup> reduction over hydrogen evolution side reaction is effectively strengthened as the consecutive hydrogen bonding network among bulk water is disrupted by the micellar structure. Consequently, Sn anode exerts an unprecedently high average Coulombic efficiency of 99.97% and witnesses a prominent life span extension from 710 to 8400&#xa0;h (~ 11-fold enhancement). In a dual-plating configuration, the Sn||Mn full battery delivers a 1.6&#xa0;V discharge plateau and sustains 790 cycles, demonstrating practical feasibility. Our findings underscore the decisive role of the very initial nucleation behavior in regulating metal electrochemistry, applicable to other multivalent anodes.</p>

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Activating Progressive Sn2+ Nucleation by Micellar Structure Electrolyte for Dead-Sn-Free Aqueous Batteries

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月3日

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  • Xiaojia Lan,
  • Zhaoyu Zhang,
  • Yuekai Lin,
  • Wencheng Du,
  • Yufei Zhang,
  • Minghui Ye,
  • Zhipeng Wen,
  • Yongchao Tang,
  • Xiaoqing Liu,
  • Cheng Chao Li

摘要

The instantaneous nucleation of Sn originating from the uncontrolled diffusion of Sn2+ ions typically forms large, electrochemically inactive “dead Sn” that severely constraints the plating/stripping reversibility of Sn anode for acidic aqueous batteries. Herein, nanoscale spatial confinement of Sn2+ ions is realized in SnSO4 electrolyte by strategically dictating spontaneous assembly of nanomicelles with amphipathic sulfolane. The as-constructed locally heterogeneous environment ensures the sustainable release of Sn2+ ions, which reprograms the nucleation manner from instantaneous to progressive modes. The consequent progressive formation of Sn nuclei triggers size refinement of electrodeposited Sn, thereby alleviating the “dead Sn” issue. Meanwhile, the reaction competitivity of Sn2+ reduction over hydrogen evolution side reaction is effectively strengthened as the consecutive hydrogen bonding network among bulk water is disrupted by the micellar structure. Consequently, Sn anode exerts an unprecedently high average Coulombic efficiency of 99.97% and witnesses a prominent life span extension from 710 to 8400 h (~ 11-fold enhancement). In a dual-plating configuration, the Sn||Mn full battery delivers a 1.6 V discharge plateau and sustains 790 cycles, demonstrating practical feasibility. Our findings underscore the decisive role of the very initial nucleation behavior in regulating metal electrochemistry, applicable to other multivalent anodes.