A flexible, self-healing and highly stretchable polymer electrolyte via quadruple hydrogen bonding for lithium-ion batteries
A flexible, self-healing and highly stretchable polymer electrolyte via quadruple hydrogen bonding for lithium-ion batteries
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用于锂离子电池的通过四氢键形成的柔性、自修复和高拉伸聚合物电解质
DOI：
10.1039/c8ta01907j
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发表时间：
2018-06
期刊：
影响因子：
--
通讯作者：
Zhigang Xue
中科院分区：
文献类型：
--
作者：
Binghua Zhou;Dan He;Ji Hu;Yunsheng Ye;Haiyan Peng;Xingping Zhou;Xiaolin Xie;Zhigang Xue
聚合物电解质被认为是锂离子电池中液体电解质的有前途的替代品，因为它们能够解决电解质易燃性和泄漏问题。然而，聚合物电解质通常会出现裂纹或断裂，这可能导致短路并带来严重的安全问题。在本文中，我们提出了一种解决这些问题的范例，其中聚合物电解质通过经由含有刷状聚（乙二醇）链的脲基嘧啶酮（UPy）的物理交联网络形成。所形成的新型聚合物电解质是柔性的，并且能够提供快速的内在自修复性和高拉伸性。它可以在没有任何外部刺激的环境条件下在2小时内愈合切割损伤，并且可以拉伸到其长度的20倍以上而不会断裂。此外，新型聚合物电解质表现出优异的与电极的界面稳定性，从而产生具有稳定的可逆电化学反应和循环的高性能电池。
Polymer electrolytes are envisioned to be promising alternatives to their liquid counterparts in lithium-ion batteries as they are able to address electrolyte inflammability and leakage issues. However, polymer electrolytes usually suffer from cracks or breakage, which could lead to short circuits and bring severe safety issues. Herein, we propose a paradigm to address these problems in which the polymer electrolyte is formed by a physically cross-linked network via ureidopyrimidinone (UPy) containing brush-like poly(ethylene glycol) chains. The formed novel polymer electrolyte is flexible and able to provide fast intrinsic self-healability and high stretchability. It can heal the cut damage within 2 hours under ambient conditions without any external stimulus and can be stretched to more than 20 times its length without breaking. Furthermore, the novel polymer electrolyte exhibits excellent interfacial stability with electrodes, resulting in high performance batteries with stable reversible electrochemical reaction and cycling.
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