Lyu Huida, Kim Jung Tae, Cheng Dongfang, Yuan Xintong, Anderson Mackenzie, Liang Keyue, Yu Jiayi, Sautet Philippe, Kaner Richard, Li Yuzhang
Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, California 90095, United States.
Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States.
ACS Energy Lett. 2025 May 22;10(6):2924-2933. doi: 10.1021/acsenergylett.5c00491. eCollection 2025 Jun 13.
Aqueous zinc-ion batteries (AZIBs) have been regarded as promising candidates for large-scale energy storage. However, the poor reversibility of Zn electrodeposition at low current densities still remains a great challenge in developing practical AZIBs. In this work, a localized eutectic electrolyte (LEE) is proposed by introducing trioxane to a baseline eutectic electrolyte, 2.0 M Zn-(OTf) in water/sulfolane (50:50 vol %), for reversible Zn anodes under challenging conditions (low N/P ratios and low current densities). Trioxane serves to disperse the aqueous eutectic domain and construct a solvation-sheath-repelled inner Helmholtz plane, thus regulating charge transfer kinetics to enable further suppression of electrolyte corrosion and improved Zn morphology. Zn||ZnVO·HO full cells with a low N/P ratio (≤4) and a low current density of 100 mA cathode (corresponding to a 0.33 C rate) exhibit enhanced cycling stability and a prolonged lifespan (nearly 3 months) in the LEE.
水系锌离子电池（AZIBs）被认为是大规模储能的有前景的候选者。然而，在低电流密度下锌电沉积的较差可逆性仍然是开发实用的水系锌离子电池的巨大挑战。在这项工作中，通过将三恶烷引入基线共晶电解质（2.0 M Zn-(OTf) 于水/环丁砜（体积比50:50））中，提出了一种局部共晶电解质（LEE），用于在具有挑战性的条件（低氮/磷比和低电流密度）下实现可逆锌阳极。三恶烷用于分散水相共晶域并构建溶剂化鞘层排斥的内亥姆霍兹平面，从而调节电荷转移动力学，以进一步抑制电解质腐蚀并改善锌的形态。具有低氮/磷比（≤4）和100 mA 阴极低电流密度（对应于0.33 C 倍率）的 Zn||ZnVO·HO 全电池在局部共晶电解质中表现出增强的循环稳定性和延长的寿命（近3个月）。
