We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Revealing the aging process of solid electrolyte interphase on SiO<sub>x</sub> anode.
- Authors
Qian, Guoyu; Li, Yiwei; Chen, Haibiao; Xie, Lin; Liu, Tongchao; Yang, Ni; Song, Yongli; Lin, Cong; Cheng, Junfang; Nakashima, Naotoshi; Zhang, Meng; Li, Zikun; Zhao, Wenguang; Yang, Xiangjie; Lin, Hai; Lu, Xia; Yang, Luyi; Li, Hong; Amine, Khalil; Chen, Liquan
- Abstract
As one of the most promising alternatives to graphite negative electrodes, silicon oxide (SiOx) has been hindered by its fast capacity fading. Solid electrolyte interphase (SEI) aging on silicon SiOx has been recognized as the most critical yet least understood facet. Herein, leveraging 3D focused ion beam-scanning electron microscopy (FIB-SEM) tomographic imaging, we reveal an exceptionally characteristic SEI microstructure with an incompact inner region and a dense outer region, which overturns the prevailing belief that SEIs are homogeneous structure and reveals the SEI evolution process. Through combining nanoprobe and electron energy loss spectroscopy (EELS), it is also discovered that the electronic conductivity of thick SEI relies on the percolation network within composed of conductive agents (e.g., carbon black particles), which are embedded into the SEI upon its growth. Therefore, the free growth of SEI will gradually attenuate this electron percolation network, thereby causing capacity decay of SiOx. Based on these findings, a proof-of-concept strategy is adopted to mechanically restrict the SEI growth via applying a confining layer on top of the electrode. Through shedding light on the fundamental understanding of SEI aging for SiOx anodes, this work could potentially inspire viable improving strategies in the future. Observing the evolution of the solid electrolyte interphase on SiOx-based electrodes in Li-ion batteries is challenging. Here, authors use three-dimensional tomography to visualize the growth of the interphase on single SiOx particles and propose a mechanical confinement strategy to prevent aging.
- Subjects
SOLID electrolytes; ELECTRON energy loss spectroscopy; SUPERIONIC conductors; NEGATIVE electrode; TOMOGRAPHY; ANODES
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-41867-6