四苯基卟啉
阳极
电解质
水溶液
电化学
分子
枝晶(数学)
金属
溶剂化
材料科学
电池(电)
无机化学
容量损失
化学
化学工程
光化学
电极
有机化学
卟啉
物理化学
功率(物理)
几何学
数学
物理
量子力学
工程类
作者
Jun Dong,Long Su,Haiying Peng,Dongdong Wang,Hanwen Zong,Gulian Wang,Jian Yang
标识
DOI:10.1002/anie.202401441
摘要
Zn metal as a promising anode of aqueous batteries faces the severe challenges from dendrite growth and side reactions. Here, tetraphenylporphyrin tetrasulfonic acid (TPPS) is explored as an electrolyte additive for advanced Zn anodes. It is interesting to note that TPPS spontaneously assembles into unique aggregates. As they adsorb on the Zn anode, the aggregates enhance the resistance to electrolyte percolation and dendrite growth compared to the reported single molecules. Meanwhile, TPPS facilitates anion association in the solvation sheath of Zn2+, and boosts the transference number of Zn2+ up to 0.95. Therefore, anion-related side reactions and anion-induced electrode overpotentials are reduced accordingly. In this context, the electrolyte containing TPPS exhibits the excellent electrochemical performance. Even under a high loading of MnO2 (25 mg cm-2), a limited Zn supply (N/P ratio=1.7), and a lean electrolyte (15 uL mAh-1), the full cells still represent a higher cumulative capacity compared to the reported data. The advantages of this electrolyte are also adapted to other cathode materials. The pouch cells of Zn|| NaV3O8·1.5H2O realize a capacity of ~0.35 Ah at 0.4 C under harsh conditions.
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