Dehydrogenation-driven Li metal-free prelithiation for high initial efficiency SiO-based lithium storage materials
- Authors
- Chung, Dong Jae; Youn, Donghan; Kim, Soohwan; Ma, Donghyeok; Lee, Jiwhan; Jeong, Won Joon; Park, Eunjun; Kim, Joon-Sup; Moon, Chulsoon; Lee, Ji Yeong; Sun, Heeyoung; Kim, Hansu
- Issue Date
- Nov-2021
- Publisher
- ELSEVIER
- Keywords
- SiO; Lithium-ion batteries; Lithium hydride; Initial Coulombic efficiency; Lithiation
- Citation
- NANO ENERGY, v.89, pp.1 - 11
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANO ENERGY
- Volume
- 89
- Start Page
- 1
- End Page
- 11
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/140561
- DOI
- 10.1016/j.nanoen.2021.106378
- ISSN
- 2211-2855
- Abstract
- Silicon monoxide (SiO) based materials are the most widely used high-capacity anode materials for commercialized lithium-ion batteries. However, their low initial Coulombic efficiency (ICE) hinders their full potential as anode materials for lithium-ion batteries. Here, we demonstrate that Li metal-free dehydrogenation-driven prelithiation employing lithium hydride (LiH) could improve the ICE of SiO up to 90.5%. Lithium liberated from LiH served as a source for preemptive formation of lithium silicate phases that are the main reason for the poor ICE of SiO, leading to three-dimensionally networked Si/lithium silicate nanocomposites, which were visualized by laser-assisted atom probe tomography (LA-APT) and scanning transmission electron microscopy (STEM). The prelithiated SiO delivered a capacity of 1203 mAh g−1 with an ICE of 90.5% without any degradation in other electrochemical performance. The improved ICE of prelithiated SiO made possible to enhance the energy density of full cell (37 mAh) by 50% compared to that adopting pristine SiO with an excellent cycle performance over 800 cycles.
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