<br>水性锌离子电池阳极添加 Rb2SO4 的强静电屏蔽效应有效抑制枝晶和副反应,Small

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水性锌离子电池阳极添加 Rb2SO4 的强静电屏蔽效应有效抑制枝晶和副反应
Small ( IF 13.0 ) Pub Date : 2023-08-30 , DOI: 10.1002/smll.202303906
Xiaoqin Zhang ₁ , Ji Chen ₁ , Heng Cao ₁ , Xiaomin Huang ₁ , Yu Liu ₁ , Yuxiang Chen ₁ , Yu Huo ₁ , Dunmin Lin ₁ , Qiaoji Zheng ₁ , Kwok-Ho Lam ₂

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水系锌离子电池（AZIB）由于其低成本和环境友好而引起了广泛关注。然而，锌（Zn）阳极表面电镀/剥离过程中枝晶的猖獗生长和严重的副反应阻碍了AZIBs的实用性。在此，提出了一种有效且无毒的Rb ₂ SO ₄阳离子电解质添加剂来解决该问题。 Rb ⁺的大阳离子优先吸附在Zn金属表面，产生强烈的屏蔽作用，实现Zn ²⁺离子沿Zn表面横向沉积，将水与Zn金属隔离，有效抑制副反应。因此，添加1.5 m m Rb ₂ SO ₄的Zn||Zn对称电池可以在0.5 mA cm ^-2 /0.25 mAh cm ^-2下循环超过6000 h，比不添加Rb ₂ SO 4 的电池长20倍。 ₄ .此外，具有Rb ₂ SO ₄的Zn||Cu不对称电池在高达500个循环的情况下实现了99.16%的非常高的平均库仑效率。此外，含有Rb ₂ SO ₄的电解质与VO ₂正极良好匹配，在5 A g ^-1下实现了412.7 mAh g ^-1的高初始容量，并在5 A g ^-1下实现了71.6%的容量保持率的优异循环稳定性。 Zn//VO ₂全电池循环 500 次后。

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Efficient Suppression of Dendrites and Side Reactions by Strong Electrostatic Shielding Effect via the Additive of Rb2SO4 for Anodes in Aqueous Zinc-Ion Batteries

Aqueous zinc-ion batteries (AZIBs) have attracted considerable attention due to their low cost and environmental friendliness. However, the rampant dendrite growth and severe side reactions during plating/stripping on the surface of zinc (Zn) anode hinder the practicability of AZIBs. Herein, an effective and non-toxic cationic electrolyte additive of Rb₂SO₄ is proposed to address the issues. The large cation of Rb⁺ is preferentially adsorbed on the surface of Zn metal to induce a strong shielding effect for realizing the lateral deposition of Zn²⁺ ions along the Zn surface and isolating water from Zn metal to effectively inhibit side reactions. Consequently, the Zn||Zn symmetric cell with the addition of 1.5 mm Rb₂SO₄ can cycle more than 6000 h at 0.5 mA cm⁻²/0.25 mAh cm⁻², which is 20 times longer than that without Rb₂SO₄. Besides, the Zn||Cu asymmetric cell with Rb₂SO₄ achieves a very high average Coulombic efficiency of 99.16% up to 500 cycles. Moreover, the electrolyte with Rb₂SO₄ well matches with the VO₂ cathode, achieving high initial capacity of 412.7 mAh g⁻¹ at 5 A g⁻¹ and excellent cycling stability with a capacity retention of 71.6% at 5 A g⁻¹ after 500 cycles for the Zn//VO₂ full cell.

更新日期：2023-08-30

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