College of Materials Science and Engineering, Zhejiang University of Technology , Hangzhou, 310014, China.
Department of Materials Science and Engineering, Stanford University , Stanford, California 94305, United States.
Nano Lett. 2017 May 10;17(5):2967-2972. doi: 10.1021/acs.nanolett.7b00221. Epub 2017 Apr 12.
An all solid-state lithium-ion battery with high energy density and high safety is a promising solution for a next-generation energy storage system. High interface resistance of the electrodes and poor ion conductivity of solid-state electrolytes are two main challenges for solid-state batteries, which require operation at elevated temperatures of 60-90 °C. Herein, we report the facile synthesis of Al/Nb codoped cubic LiLaZrO (LLZO) nanoparticles and LLZO nanoparticle-decorated porous carbon foam (LLZO@C) by the one-step Pechini sol-gel method. The LLZO nanoparticle-filled poly(ethylene oxide) electrolyte shows improved conductivity compared with filler-free samples. The sulfur composite cathode based on LLZO@C can deliver an attractive specific capacity of >900 mAh g at the human body temperature 37 °C and a high capacity of 1210 and 1556 mAh g at 50 and 70 °C, respectively. In addition, the solid-state Li-S batteries exhibit high Coulombic efficiency and show remarkably stable cycling performance.
一种具有高能量密度和高安全性的全固态锂离子电池是下一代储能系统的有前途的解决方案。电极的高界面电阻和固态电解质的差离子电导率是固态电池的两个主要挑战，这需要在 60-90°C 的升高温度下运行。在此，我们通过一步法 Pechini 溶胶-凝胶法报告了 Al/Nb 共掺杂立方 LiLaZrO（LLZO）纳米粒子和 LLZO 纳米颗粒修饰的多孔碳泡沫（LLZO@C）的简便合成。与无填充样品相比，填充有 LLZO 纳米颗粒的聚（环氧乙烷）电解质显示出改善的电导率。基于 LLZO@C 的硫复合阴极在人体温度 37°C 时可提供>900 mAh g 的高比容量，在 50°C 和 70°C 时分别可提供 1210 和 1556 mAh g 的高容量。此外，固态 Li-S 电池表现出高库仑效率，并显示出显著稳定的循环性能。
