Li Zhuo, Sha Wu-Xin, Guo Xin
State Key Laboratory of Material Processing and Die & Mould Technology, Laboratory of Solid State Ionics, School of Materials Science and Engineering , Huazhong University of Science and Technology , Wuhan 430074 , P. R. China.
ACS Appl Mater Interfaces. 2019 Jul 31;11(30):26920-26927. doi: 10.1021/acsami.9b07830. Epub 2019 Jul 16.
We report a three-dimensional (3D) garnet framework-reinforced solid composite electrolyte with enhanced Li-ion conductivity and excellent thermal, mechanical, and electrochemical stabilities. The 3D garnet framework is fabricated via the polymeric sponge method, using low-cost polyurethane foam as the template. The interconnected 3D garnet framework not only reinforces the composite electrolyte but also forms continuous Li-ion transport pathways, thereby increasing the ionic conductivity. The 3D garnet composite electrolyte shows an ionic conductivity of 1.2 × 10 S cm at 30 °C, about two times as high as that of the garnet particle-reinforced composite electrolyte. The Li-Li symmetric cell based on the 3D garnet composite electrolyte can be cycled more than 360 h without short circuit, suggesting an improved ability to suppress Li-dendrites. The Li/3D garnet composite electrolyte/LiFePO battery demonstrates stable cycling performance at 0.5 C. Owing to the cost-saving characteristics, the 3D garnet-reinforced solid composite electrolyte is promising for mass production.
我们报道了一种三维（3D）石榴石骨架增强的固体复合电解质，其具有增强的锂离子传导性以及优异的热稳定性、机械稳定性和电化学稳定性。该三维石榴石骨架通过聚合物海绵法制备，使用低成本的聚氨酯泡沫作为模板。相互连接的三维石榴石骨架不仅增强了复合电解质，还形成了连续的锂离子传输路径，从而提高了离子传导率。该三维石榴石复合电解质在30℃时的离子传导率为1.2×10 S cm，约为石榴石颗粒增强复合电解质的两倍。基于三维石榴石复合电解质的锂-锂对称电池可循环超过360小时而不短路，表明其抑制锂枝晶的能力有所提高。锂/三维石榴石复合电解质/磷酸铁锂电池在0.5 C下表现出稳定的循环性能。由于具有成本节约特性，三维石榴石增强的固体复合电解质在大规模生产方面具有前景。
