Journal
NANO ENERGY
Volume 89, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106378
Keywords
SiO; Lithium-ion batteries; Lithium hydride; Initial Coulombic efficiency; Lithiation
Categories
Funding
- Korea Evaluation Institute of Industrial Technology (KEIT) - Ministry of Trade, Industry and Energy, Republic of Korea [10067182]
- Technology Development Program through the National Research Foundation of Korea (NRF) - Korea government (MIST) [NRF-2017M1A2A2044501]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10067182] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Research shows that dehydrogenation-driven prelithiation using lithium hydride can significantly improve the initial Coulombic efficiency of silicon monoxide, thereby enhancing the performance of lithium-ion batteries. Silicon monoxide prelithiated through this method exhibits higher capacity and better cycling stability in tests, enabling a significant increase in the energy density of the overall battery system.
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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