Zhang Lei, Gao Haiqi, Guan Lixiang, Li Yuchao, Wang Qian
School of Materials and Chemical Engineering, Chuzhou University, 1528 Fengle Avenue, Chuzhou 239099, China.
State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, China.
Polymers (Basel). 2023 Jan 16;15(2):466. doi: 10.3390/polym15020466.
The key to developing high-performance polymer electrolytes (PEs) is to achieve their high strength and high ionic conductivity, but this is still challenging. Herein, we designed a new double-network PE based on the nonhydrolytic sol-gel reaction of tetraethyl orthosilicate and in situ polymerization of zwitterions. The as-prepared PE possesses high strength (0.75 Mpa) and high stretchability (560%) due to the efficient dissipation energy of the inorganic network and elastic characteristics of the polymer network. In addition, the highest ionic conductivity of the PE reaches 0.44 mS cm at 30 °C owning to the construction of dynamic ion channels between the polyzwitterion segments and between the polyzwitterion segments and ionic liquids. Furthermore, the inorganic network can act as Lewis acid to adsorb trace impurities, resulting in a prepared electrolyte with a high electrochemical window over 5 V. The excellent interface compatibility of the as-prepared PE with a Li metal electrode is also confirmed. Our work provides new insights into the design and preparation of high-performance polymer-based electrolytes for solid-state energy storage devices.
开发高性能聚合物电解质（PEs）的关键在于实现其高强度和高离子电导率，但这仍然具有挑战性。在此，我们基于原硅酸四乙酯的非水解溶胶-凝胶反应和两性离子的原位聚合设计了一种新型双网络PE。由于无机网络的有效能量耗散和聚合物网络的弹性特性，所制备的PE具有高强度（0.75 Mpa）和高拉伸性（560%）。此外，由于在聚两性离子链段之间以及聚两性离子链段与离子液体之间构建了动态离子通道，该PE在30°C时的最高离子电导率达到0.44 mS cm。此外，无机网络可作为路易斯酸吸附痕量杂质，从而制备出具有超过5 V的高电化学窗口的电解质。所制备的PE与锂金属电极之间优异的界面相容性也得到了证实。我们的工作为固态储能器件的高性能聚合物基电解质的设计和制备提供了新的见解。
