Wang Xiaodan, Lu Yao, Geng Dongsheng, Li La, Zhou Dan, Ye Huanyu, Zhu Yuchen, Wang Rongming
Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China.
State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China.
ACS Appl Mater Interfaces. 2020 Dec 2;12(48):53774-53780. doi: 10.1021/acsami.0c15305. Epub 2020 Nov 13.
Stretchable lithium-ion batteries (LIBs) have attracted great attention as a promising power source in the emerging field of wearable electronics. Despite the recent advances in stretchable electrodes, separators, and sealing materials, building stretchable full batteries remains a big challenge. Herein, a simple strategy to prepare stretchable electrodes and separators at the full battery scale is reported. Then, electrostatic spraying is used to make the anode and cathode on an elastic current collector. Finally, a polyvinylidene fluoride/thermoplastic polyurethane nanofiber separator is hot-sandwiched between the cathode and anode. The fabricated battery shows stable electrochemical performance during repeatable release-stretch cycles. In particular, a stable capacity of 6 mA•h/cm at the current rate of 0.5 C can be achieved for the fully stretchable LIB. More importantly, over 70% of the initial capacity can be maintained after 100 cycles with ∼150% stretch.
可拉伸锂离子电池（LIBs）作为可穿戴电子这一新兴领域中颇具前景的电源，已引起了广泛关注。尽管在可拉伸电极、隔膜和密封材料方面取得了最新进展，但构建可拉伸全电池仍然是一项巨大挑战。在此，报道了一种在全电池规模上制备可拉伸电极和隔膜的简单策略。然后，采用静电喷涂法在弹性集流体上制作阳极和阴极。最后，将聚偏二氟乙烯/热塑性聚氨酯纳米纤维隔膜热夹在阴极和阳极之间。所制备的电池在可重复的释放-拉伸循环过程中表现出稳定的电化学性能。特别是，对于完全可拉伸的LIB，在0.5 C的电流速率下可实现6 mA•h/cm的稳定容量。更重要的是，在进行约150%拉伸的100次循环后，仍可保持超过70%的初始容量。
