The development of silicon anodes to replace conventional graphite in efforts to increase energy densities of lithium-ion batteries has been largely impeded by poor interfacial stability against liquid electrolytes. Here, stable operation of 99.9 weight% micro-Si (uSi) anode is enabled by utilizing the interface passivating properties of sulfide based solid-electrolytes. Bulk to surface characterization, as well as quantification of interfacial components showed that such an approach eliminates continuous interfacial growth and irreversible lithium losses. In uSi || layered-oxide full cells, high current densities at room temperature (5 mA cm 2), wide operating temperature (-20{\deg}C to 80{\deg}C) and high loadings (>11 mAh cm-2) were demonstrated for both charge and discharge operations. The promising battery performance can be attributed to both the desirable interfacial property between uSi and sulfide electrolytes, as well as the unique chemo-mechanical behavior of the Li-Si alloys.
@article{arxiv.2103.04230,
title = {Carbon Free High Loading Silicon Anodes Enabled by Sulfide Solid Electrolytes for Robust All Solid-State Batteries},
author = {Darren H. S. Tan and Yu-Ting Chen and Hedi Yang and Wurigumula Bao and Bhagath Sreenarayanan and Jean-Marie Doux and Weikang Li and Bingyu Lu and So-Yeon Ham and Baharak Sayahpour and Jonathan Scharf and Erik A. Wu and Grayson Deysher and Hyea Eun Han and Hoe Jin Hah and Hyeri Jeong and Zheng Chen and Ying Shirley Meng},
journal= {arXiv preprint arXiv:2103.04230},
year = {2021}
}