Controllable Solid Electrolyte Interphase by Ionic Environment Regulation for Stable Zn-Ion Battery,Small

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Controllable Solid Electrolyte Interphase by Ionic Environment Regulation for Stable Zn-Ion Battery
Small ( IF 13.0 ) Pub Date : 2023-12-10 , DOI: 10.1002/smll.202309057
Jingwen Liu _{1,

2} , Caixia Li _{1,

3} , Kai Zhang _{1,

2} , Shenghao Zhang _{1,

3} , Chao Zhang _{1,

2} , Yu Yang _{1,

2} , Lei Wang _{1,

2,

3}

Affiliation

Artificial solid electrolyte interphase in organic solutions is effective and facile for long-cycling aqueous zinc ion batteries. However, the specific effects on different ionic environments have not been thoroughly investigated. Herein, pyromellitic acid (PA) are employed as organic ligand to coordinate with Zn²⁺ under various ionic environments. The connection between the ionic environment and reaction spontaneity is analyzed to provide insights into the reasons behind the effectiveness of the SEI layer and to characterize its protective impact on the zinc anode. Notably, the PA solution (pH4) lacking OH⁻ contributes to the formation of a dense and ultrathin SEI with Zn-PA coordination, preventing direct contact between the anode and electrolyte. Moreover, the presence of organic functional groups facilitates a uniform flux of Zn²⁺. These advantages enable stable cycling of the PA4-Zn symmetric cell at a current density of 3 mA cm⁻² for over 3500 h. The PA4-Zn//MVO full cell demonstrates excellent electrochemical reversibility. Investigating the influence of the ionic environment on SEI generation informs the development of novel SEI strategies.

中文翻译：

离子环境调节可控固体电解质界面稳定锌离子电池

有机溶液中的人造固体电解质界面对于长循环水性锌离子电池来说是有效且容易的。然而，对不同离子环境的具体影响尚未得到彻底研究。在此，采用均苯四酸(PA)作为有机配体在各种离子环境下与Zn ²⁺配位。分析离子环境和反应自发性之间的联系，以深入了解 SEI 层有效性背后的原因，并表征其对锌阳极的保护作用。值得注意的是，缺乏 OH ^-的 PA 溶液 (pH4) 有助于形成具有 Zn-PA 配位的致密超薄 SEI，从而防止阳极和电解质之间的直接接触。此外，有机官能团的存在有利于Zn ²⁺的均匀通量。这些优点使得PA4-Zn对称电池能够在3 mA cm ^-2的电流密度下稳定循环超过3500小时。 PA4-Zn//MVO 全电池表现出优异的电化学可逆性。研究离子环境对 SEI 生成的影响为新型 SEI 策略的开发提供了信息。

更新日期：2023-12-10

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