材料科学
电解质
化学工程
阴极
肿胀 的
自愈水凝胶
聚合物
电化学
离子电导率
储能
电极
电导率
柔性电子器件
纳米技术
复合材料
高分子化学
化学
功率(物理)
物理
物理化学
量子力学
工程类
作者
Wei Liu,Yu‐Cheng Huang,Ziwei Cai,Tan Yue-jin,Bendong Huang,Hai Zhong,Yaohua Mai
出处
期刊:Small
[Wiley]
日期:2023-06-25
标识
DOI:10.1002/smll.202303480
摘要
The high conductivities and good mechanical properties of hydrogel electrolyte films are critical for energy storage devices with high flexibility, fast redox kinetics, and long life. Herein, a low water content (6.63 wt%) hydrogel film is prepared, and a favorable environment is created, with an electrochemical stability window of 2.26 V and a high ionic conductivity of 2.6 mS cm-1 . The hydrogel film exhibits good folding ability, low in-plane swelling, and anti-freezing abilities. These properties are benefitted by immobilizing free water molecules on the abundant oxygenic groups of polymer fibers in the hydrogel film, offering a unique 3D channel to allow Li+ to quickly transport along the polymer network. Therefore, the hydrogel film-based all-in-one flexible cell exhibits stable cycling performance with a retention of 81.8% of the initial capacity after 500 cycles at room temperature and 66.2% of capacity retention at -30 °C. Furthermore, the full cell with high cathode loading (≈21 mg cm-2 ) exhibits a high areal capacity of 2.5 mAh cm-2 (≈119 mAh g-1 ). The overall merits of flexible all-in-one quasi-solid-state batteries demonstrate high potential to be used for power wearable electronics.
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