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Si Nanocrystal-Embedded SiO x nanofoils: Two-Dimensional Nanotechnology-Enabled High Performance Li Storage Materials.


ABSTRACT: Silicon (Si) based materials are highly desirable to replace currently used graphite anode for lithium ion batteries. Nevertheless, its usage is still a big challenge due to poor battery performance and scale-up issue. In addition, two-dimensional (2D) architectures, which remain unresolved so far, would give them more interesting and unexpected properties. Herein, we report a facile, cost-effective, and scalable approach to synthesize Si nanocrystals embedded 2D SiO x nanofoils for next-generation lithium ion batteries through a solution-evaporation-induced interfacial sol-gel reaction of hydrogen silsesquioxane (HSiO1.5, HSQ). The unique nature of the thus-prepared centimeter scale 2D nanofoil with a large surface area enables ultrafast Li+ insertion and extraction, with a reversible capacity of more than 650 mAh g-1, even at a high current density of 50?C (50?A?g-1). Moreover, the 2D nanostructured Si/SiO x nanofoils show excellent cycling performance up to 200 cycles and maintain their initial dimensional stability. This superior performance stems from the peculiar nanoarchitecture of 2D Si/SiO x nanofoils, which provides short diffusion paths for lithium ions and abundant free space to effectively accommodate the huge volume changes of Si during cycling.

SUBMITTER: Yoo H 

PROVIDER: S-EPMC5932046 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature

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Si Nanocrystal-Embedded SiO <sub>x</sub> nanofoils: Two-Dimensional Nanotechnology-Enabled High Performance Li Storage Materials.

Yoo Hyundong H   Park Eunjun E   Bae Juhye J   Lee Jaewoo J   Chung Dong Jae DJ   Jo Yong Nam YN   Park Min-Sik MS   Kim Jung Ho JH   Dou Shi Xue SX   Kim Young-Jun YJ   Kim Hansu H  

Scientific reports 20180502 1


Silicon (Si) based materials are highly desirable to replace currently used graphite anode for lithium ion batteries. Nevertheless, its usage is still a big challenge due to poor battery performance and scale-up issue. In addition, two-dimensional (2D) architectures, which remain unresolved so far, would give them more interesting and unexpected properties. Herein, we report a facile, cost-effective, and scalable approach to synthesize Si nanocrystals embedded 2D SiO <sub>x</sub> nanofoils for n  ...[more]

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