期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 19, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202100434
关键词
flexible batteries; high‐ energy‐ densities; lithium‐ ion batteries; rapid electron; ion transport; ultra‐ thick electrodes
类别
资金
- Natural Science Foundations of China [51973236, 51573213, 52003200]
- Pearl River Nova Program of Guangzhou [201610010163]
- Youth Innovation Talent Project for the Universities of Guangdong [2020KQNCX089]
- Science Foundation of High-Level Talents of Wuyi University [2019AL019]
By using ethylene vinyl acetate copolymer (EVA) as flexible supports and ion channels, high-energy-density flexible LFP/CNT/EVA cathode and LTO/CNT/EVA anode are successfully prepared, achieving high energy density and all flexible LIBs. The system is able to maintain a constant specific capacity while increasing thickness, resulting in ultrahigh areal capacity.
Flexible lithium-ion batteries (LIBs) with high energy density are of urgent need for the ever-increasing flexible and wearable electronic equipments, but limited by the low areal loading of active materials in traditional electrodes with lamellar structure. It is still a great challenge to solve the sluggish electron/ion transport problem caused by increasing the areal loading of active materials. Herein, a kind of ethylene vinyl acetate copolymer (EVA) is proposed to provide flexible supports and ion channels for ultra-thick flexible LFP/CNT/EVA cathode and LTO/CNT/EVA anode, thereby achieving high energy density and all flexible LIBs. LFP/CNT/EVA shows a ternary homogeneous structure formed by the entanglement of EVA chains and CNT on LFP, which attributes to LFP content up to 80wt% and adjustable thickness from 20 to 460 mu m. In sharp contrast to previous studies LFP/CNT/EVA delivers basically the constant specific capacity of approximate to 160 mAh g(-1) at a 0.1 C rate with the thickness increasing, thus achieving ultrahigh areal capacity up to 4.56 mAh cm(-2). A flexible full LIBs based on LFP/CNT/EVA and LTO/CNT/EVA is demonstrated and exhibits favorable cycle performance under an alternant flat and bending state. Those findings are supposed to open new avenues for designing high-energy-density flexible LIBs for future wearable energy storage devices.
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