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Cellulose mesh supported ultrathin ceramic-based composite electrolyte for high-performance Li metal batteries
Journal of Membrane Science ( IF 8.4 ) Pub Date : 2022-08-10 , DOI: 10.1016/j.memsci.2022.120907
Dan Cai , Shengzhao Zhang , Min Su , Zipeng Ma , Jiaqi Zhu , Yu Zhong , Xuming Luo , Xiuli Wang , Xinhui Xia , Changdong Gu , Jiangping Tu

Oxide electrolytes show great potential in solid-state batteries due to their good stability and high ionic conductivity. However, some fatal shortcomings such as complex manufacture, large thickness, inferior flexibility and poor contact with electrodes caused by intrinsic rigidity and brittleness of oxides hinder their large-scale commercial application. Herein, an ultrathin ceramic (LAGP) membrane supported by light-weight cellulose mesh (LAC) is fabricated by a facile solution-casting method, in which a few PVDF serves as binder. Then gel electrolyte containing FEC is introduced on both sides of LAC by in-situ polymerization method to resolve the interfacial issue including poor contact and incompatibility between electrodes and LAC. The ultrathin LAC ceramic membrane presents a thickness of about 21 μm and exhibits superior flexibility, and the obtained gel electrolyte modified ceramic-based composite electrolyte (LACF) displays ultrahigh ionic conductance (86.05 mS), wide electrochemical window (4.7 V) and high Li+ transference number (0.54) at 25 °C. More importantly, the LACF composite electrolyte shows good stability to Li anode due to the LAC membrane with high proportion of mechanically-robust ceramic particles and FEC-containing gel electrolyte interlayer, which enables stable and uniform Li stripping/plating in Li/LACF/Li cell for 300 h at 0.1 mA cm−2. As a consequence, the LFP/LACF/Li full cell demonstrates excellent cyclic stability as the discharge capacity just shows an extremely minor decrease after 180 cycles at 0.5 C. Therefore, this work provides a novel insight for preparing flexible ceramic-based composite electrolyte which enables high-performance and safe Li metal batteries.



中文翻译:

用于高性能锂金属电池的纤维素网支撑的超薄陶瓷基复合电解质

氧化物电解质由于其良好的稳定性和高离子电导率在固态电池中显示出巨大的潜力。然而,氧化物固有的刚性和脆性导致其制造复杂、厚度大、柔韧性差、与电极接触不良等致命缺点阻碍了其大规模商业应用。在此,一种由轻质纤维素网 (LAC) 支撑的超薄陶瓷 (LAGP) 膜通过简便的溶液浇铸法制造,其中少量 PVDF 作为粘合剂。然后通过原位聚合法在LAC两侧引入含有FEC的凝胶电解质,解决了电极与LAC接触不良、不相容等界面问题。超薄 LAC 陶瓷膜的厚度约为 21 μm,具有出色的柔韧性,+转移数 (0.54) 在 25 °C。更重要的是,由于 LAC 膜具有高机械强度陶瓷颗粒和含 FEC 的凝胶电解质中间层,LACF 复合电解质对锂负极表现出良好的稳定性,这使得在 Li/LACF/Li 中能够稳定、均匀地脱/镀锂。电池在 0.1 mA cm -2下 300 小时。因此,LFP/LACF/Li 全电池表现出优异的循环稳定性,因为在 0.5 C 下循环 180 次后放电容量仅显示出极小的下降。因此,这项工作为制备柔性陶瓷基复合电解质提供了新的见解。使高性能和安全的锂金属电池成为可能。

更新日期:2022-08-10
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