Highly Reversible Zn Metal Anode Securing by Functional Electrolyte Modulation,Advanced Energy Materials

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Highly Reversible Zn Metal Anode Securing by Functional Electrolyte Modulation
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2024-06-10 , DOI: 10.1002/aenm.202400872
Chuanlin Li ₁ , Xixi Zhang ₁ , Guangmeng Qu ₂ , Shunshun Zhao ₃ , Hongjie Qin ₁ , Dingzheng Li ₁ , Na Li ₁ , Chenggang Wang _{1,

4} , Xijin Xu ₁

Affiliation

The stability of the Zn metal anode is significantly affected by the various parasitic reactions during plating/stripping. Here, sodium 4-aminobenzenesulfonate (SABS) is a functional electrolyte additive to modulate the electrode/electrolyte interface to protect the Zn metal. An electrical double layer (EDL) reconstruction of the interface is affected by providing hydrogen bond sites through nitrogen and oxygen elements with lone pair electrons in SABS molecules. These strong hydrogen bonds not only limit the corrosion of free H₂O molecules on the surface of Zn anode but also promote the desolvation process. Besides, the SABS can be further in situ decomposed into a solid electrode/electrolyte interface (SEI) layer to regulate the plating/stripping behavior of Zn²⁺. As a result, based on the synergism of organic–inorganic hybrid SEI layer and the EDL reconstruction, the Zn//Zn symmetric cells exceptionally survive lasting for 6500 hours at 1 mA cm⁻² and 1 mAh cm⁻², and over 900 cycles even at 40 mA cm⁻² and 10 mAh cm⁻². The Zn-I₂ full cell maintains excellent cycle stability of 92.4% after 20000 cycles. Remarkably, the pouch cell maintains a capacity retention of over 99.1% (63 mAh) for 820 cycles at 5 mA cm⁻².

中文翻译：

通过功能性电解质调节确保高度可逆的锌金属阳极

锌金属阳极的稳定性受到电镀/剥离过程中各种寄生反应的显着影响。此处，4-氨基苯磺酸钠 (SABS) 是一种功能性电解质添加剂，可调节电极/电解质界面以保护锌金属。通过氮和氧元素与 SABS 分子中的孤对电子提供氢键位点，可以影响界面的双电层 (EDL) 重建。这些强氢键不仅限制了Zn阳极表面游离H ₂ O分子的腐蚀，而且促进了去溶剂化过程。此外，SABS可以进一步原位分解成固体电极/电解质界面（SEI）层来调节Zn ²⁺的电镀/剥离行为。结果，基于有机-无机杂化SEI层和EDL重建的协同作用，Zn//Zn对称电池在1 mA cm ^-2和1 mAh cm ^-2下持续存活6500小时，循环次数超过900次即使在40 mA cm ^-2和10 mAh cm ^-2下也是如此。 Zn-I ₂全电池在 20000 次循环后仍保持 92.4% 的优异循环稳定性。值得注意的是，软包电池在5 mA cm ^-2下循环820次后容量保持率超过99.1% (63 mAh)。

更新日期：2024-06-10

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