Flexible All-in-one Quasi-Solid-State Batteries Enabled by Low-water-content Hydrogel Films |
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Authors: | Wei Liu Yucheng Huang Ziwei Cai Yingxiang Tan Bendong Huang Hai Zhong Yaohua Mai |
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Affiliation: | Institute of New Energy Technology, College of Information Science and Technology Jinan University, Guangzhou, 510006 China |
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Abstract: | 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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Keywords: | all-in-on cells anti-freezing abilities flexible hydrogel films low in-plane swelling low water content |
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