2021
DOI: 10.1021/acs.energyfuels.1c02922
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Potassium Ions Regulated the Disproportionation of Silicon Monoxide Boosting Its Performance for Lithium-Ion Battery Anodes

Abstract: Silicon monoxide (SiO) has captured great attention as one of the most promising anode materials due to its great cycling stability as well as high theoretical capacity. However, hindered by its low initial Coulombic efficiency, the possible large-scale application remains an urgent issue. Herein, through a facile method, potassium ions are introduced into the disproportionation process of SiO to promote the transition from amorphous SiO x into the cristobalite phase with higher crystallinity. The cristobalit… Show more

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Cited by 14 publications
(5 citation statements)
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“…However, the application of silicon anode materials also brings new challenges, of which the most notable is volumetric expansion during charging and discharging. Specifically, during the battery charging process, silicon reacts with lithium to form a lithium–silicon alloy, and the volume of silicon particles may increase by as much as 300%, while this phenomenon is much milder in graphite. This significant volume change can cause rupture of the electrode material , or even dislodgement from the collector, , leading to a rapid decrease in the battery capacity. In extreme cases, this expansion may even lead to a short circuit inside the battery, increasing the safety risk during use.…”
Section: Introductionmentioning
confidence: 99%
“…However, the application of silicon anode materials also brings new challenges, of which the most notable is volumetric expansion during charging and discharging. Specifically, during the battery charging process, silicon reacts with lithium to form a lithium–silicon alloy, and the volume of silicon particles may increase by as much as 300%, while this phenomenon is much milder in graphite. This significant volume change can cause rupture of the electrode material , or even dislodgement from the collector, , leading to a rapid decrease in the battery capacity. In extreme cases, this expansion may even lead to a short circuit inside the battery, increasing the safety risk during use.…”
Section: Introductionmentioning
confidence: 99%
“…Moreover, MnO 2 suffers from irreversible structural collapse upon ion insertion/extraction, which reduces the cycling stability of ZIBs . Recently, MnS-based ZIB cathodes have been proposed. , After initial electrochemical activation, involving MnS surface oxidation and restructuration, abundant vacancies and reactive sites are formed, which significantly boost Zn 2+ diffusion kinetics. However, because MnS is a large indirect bandgap semiconductor (3.1 eV) with moderate electronic conductivity, its reaction kinetics are restricted during the initial activation, thereby reducing its high-capacity potential. Meanwhile, its insufficient conductivity will result in an arresting reaction overpotential, leading to the decomposition of the electrolyte. Furthermore, the prolonged activation period induces an excessive dissolution of Mn 2+ , which ultimately reduces the reversible capacity of the electrode.…”
Section: Introductionmentioning
confidence: 99%
“…Hence, the above three directions are basic ideas for solving the current problem of anode materials for SiO x substrates. Therefore, measures to improve the performance of SiO x -based anode materials include the following: (1) improved electrochemical performance through disproportionation reactions above 800 °C or with other ions, (2) reducing the influence of the volume effect through material design and increasing the ICE value, and (3) improving the coulombic efficiency and cycle efficiency of the battery by doping, coating, modifying, binder design, electrolyte additives, and modifying the microstructure of SiO x . Among the above methods, adding external heteroatoms can be a cost-efficient and simple approach, and there have been many excellent results, including both metallic and non-metallic SiO x anodes.…”
Section: Introductionmentioning
confidence: 99%