Self-Healing Polymer Electrolytes Formed via Dual-Networks: A New Strategy for Flexible Lithium Metal Batteries

被引:92
作者
Zhou, Binghua [1 ]
Zuo, Cai [1 ]
Xiao, Zhuliu [1 ]
Zhou, Xingping [1 ]
He, Dan [1 ]
Xie, Xiaolin [1 ]
Xue, Zhigang [1 ]
机构
[1] Huazhong Univ Sci & Technol, Minist Educ, Sch Chem & Chem Engn, Key Lab Mat Chem Energy Convers & Storage, Wuhan 430074, Hubei, Peoples R China
基金
中国国家自然科学基金;
关键词
dual-network; poly(ethylene oxide); polymer electrolyte; quadruple hydrogen bonding; self-healing; SOLID POLYMER; COMPOSITE; TOUGH; CONDUCTIVITY; PERFORMANCE; COPOLYMERS; HYDROGELS; BEHAVIOR;
D O I
10.1002/chem.201803943
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A novel polymer electrolyte with mechanically robust and self-healing properties was fabricated through a dual-network structure, crosslinked by quadruple hydrogen bonding and chemical bonding. The dynamic ureido-pyrimidinone (UPy) dimers were the first network in the polymer matrix. This group endows the polymer electrolyte with good self-healing capacity and improves the reliability and lifetime of the polymer lithium batteries. The crosslinked polyethylene glycol-bis-carbamate dimethacrylate (PEGBCDMA) is the second network and guarantees dimensional stability and good mechanical properties of the polymer electrolyte. The dual-network self-healing polymer electrolyte (DN-SHPE) exhibits improved ionic conductivity versus the polymer electrolyte fabricated by poly(ethylene glycol) diacrylate (PEGDA). It has high thermal stability (up to 350 degrees C) and excellent interfacial stability with the electrodes. When the DN-SHPE-based cells were fabricated with LiFePO4 and Li metal, the resulting cells show good reversible specific capacity and considerable rate capability. Moreover, the pouch cell could maintain electrochemical function even under deformation or folding conditions.
引用
收藏
页码:19200 / 19207
页数:8
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