电解质
材料科学
阳极
法拉第效率
水溶液
化学工程
阴极
PEG比率
聚乙二醇
无机化学
电极
化学
有机化学
物理化学
经济
工程类
财务
作者
Renqian Tao,Hongwei Fu,Caitian Gao,Ling Fan,Erqing Xie,Lyu Wang,Shuquan Liang,Bingan Lu
标识
DOI:10.1002/adfm.202303072
摘要
Abstract Electrolytes are highly important for aqueous Al ion batteries (AAIBs). However, Al metal anode usually has poor reversibility of plating/tripping, resulting in low Coulombic efficiency (CE) and poor cycling stability by using traditional Al ion electrolyte. Herein, a novel type of aqueous Al ion electrolyte with polyethylene glycol (PEG) as the primary skeleton for solvated Al ions is proposed, named as PEG‐Al@H. Outstandingly, an Al electrolyte interface (AEI) is generated on the Al metal surface during galvanostatic charging process by polymerization of PEG. It is proved that AEI, acting as the protective layer, effectively mitigates the side reaction caused by the rapid kinetic in aqueous electrolyte and prevents Al metal anode from deeply corroding. Moreover, PEG disrupts the hydrogen bond of the solvent in the electrolyte, extending the working temperature of AAIBs. The design that a full‐cell consisting of PEG‐Al@H as the electrolyte, potassium manganese hexacyanoferrate as the cathode, Al metal as anode can run over 20 000 cycles at 500 mA g −1 , with an average CE higher than 95%. More importantly, even at −5 °C, for the first time, an initial capacity of 16 mAh in a pouch‐cell is achieved and maintain roughly 87% of capacity after 5500 cycles.
科研通智能强力驱动
Strongly Powered by AbleSci AI