Elastic and well-aligned ceramic LLZO nanofiber based electrolytes for solid-state lithium batteries

By Yun Zhao, Jianhua Yan, C. Weiping, Y. Lai, Jun Song, Jianyong Yu, Bin Ding. 2019

180 citations recorded by the source corpus.

Abstract Ceramic Li7La3Zr2O12 is one of the most attractive electrolyte materials for solid-state batteries due to its high ionic conductivity and chemical/thermal stability, but the battery performance is always limited by the high electrolyte-electrode interfacial resistances. Here, we have fabricated elastic solid electrolytes by filling ionic-conductive polymers into well-aligned Li6.4La3Zr2Al0.2O12 (LLZO) nanofiber films. Such electrolytes can provide fast and continuous ionic-transportation channels and thus exhibit a high ionic conductivity of 1.16 × 10−4 S cm−1 at 30 °C. Moreover, the elastic surfaces of the electrolytes can well conform to electrodes without separations to adapt volume changes of the electrodes during the repeated cycles, enabling a stable Li plating/stripping cycling over 700 h. Fabricated solid-state NCA//Li cells exhibit ultra-low internal resistances of 87 Ω and deliver large discharge capacities with high Coulombic efficiencies that are comparable with the liquid type batteries. The reported approach allows low-cost fabrication of solid electrolytes that possess high ionic conductivity for solid state batteries.

Subfields: Automotive Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/c77a9de178da2ce950a7ca5379f9f04e981cd6c1