Revealing the aging process of solid electrolyte interphase on SiOx anode

Qian，Guoyu1,2; Li，Yiwei1; Chen，Haibiao1,3; Xie，Lin4; Liu，Tongchao5; Yang，Ni1; Song，Yongli1; Lin，Cong1,6; Cheng，Junfang7,8; Nakashima，Naotoshi7; Zhang，Meng9; Li，Zikun9; Zhao，Wenguang1; Yang，Xiangjie2; Lin，Hai1; Lu，Xia2; Yang，Luyi1; Li，Hong10; Amine，Khalil5; Chen，Liquan10; Pan，Feng1

2023-12-01

10.1038/s41467-023-41867-6

Nature Communications   影响因子和分区

2041-1723

As one of the most promising alternatives to graphite negative electrodes, silicon oxide (SiO) has been hindered by its fast capacity fading. Solid electrolyte interphase (SEI) aging on silicon SiO 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 SiO. 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 SiO anodes, this work could potentially inspire viable improving strategies in the future.

SCI

英语

NI论文

其他

WOS:001080410400007

2-s2.0-85173577966

Scopus

1.School of Advanced Materials,Peking University,Shenzhen Graduate School,Shenzhen,China
2.School of Materials,Sun Yat-sen University,Shenzhen,China
3.Institute of Marine Biomedicine,Shenzhen Polytechnic,Shenzhen,China
4.Department of Physics,Southern University of Science and Technology,Shenzhen,China
5.Chemical Sciences and Engineering Division,Argonne National Laboratory,Argonne,United States
6.Department of Applied Biology and Chemical Technology,The Hong Kong Polytechnic University,Hong Kong
7.International Institute for Carbon-Neutral Energy Research (WPI-I2CNER),Kyushu University,Fukuoka,Japan
8.SJTU Paris Elite Institute of Technology,Shanghai Jiao Tong University,Shanghai,200240,China
9.BTR New Material Group Co.,Ltd,Shenzhen,China
10.Institute of Physics,Chinese Academy of Sciences,Beijing,China

Qian，Guoyu,Li，Yiwei,Chen，Haibiao,et al. Revealing the aging process of solid electrolyte interphase on SiOx anode[J]. Nature Communications,2023,14(1).

Qian，Guoyu.,Li，Yiwei.,Chen，Haibiao.,Xie，Lin.,Liu，Tongchao.,...&Pan，Feng.(2023).Revealing the aging process of solid electrolyte interphase on SiOx anode.Nature Communications,14(1).

Qian，Guoyu,et al."Revealing the aging process of solid electrolyte interphase on SiOx anode".Nature Communications 14.1(2023).