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Ionothermal Synthesis of Crystalline Nanoporous Silicon and Its Use as Anode Materials in Lithium-Ion Batteries.

ABSTRACT: Silicon has great potential as an anode material for high-performance lithium-ion batteries (LIBs). This work reports a facile, high-yield, and scalable approach to prepare nanoporous silicon, in which commercial magnesium silicide (Mg₂Si) reacted with the acidic ionic liquid at 100?°C and ambient pressure. The obtained silicon consists of a crystalline, porous structure with a BET surface area of 450 m²/g and pore size of 1.27?nm. When coated with the nitrogen-doped carbon layer and applied as LIB anode, the obtained nanoporous silicon-carbon composites exhibit a high initial Coulombic efficiency of 72.9% and possess a specific capacity of 1000?mA?h?g^-1 at 1 A g^-1 after 100?cycles. This preparation method does not involve high temperature and pressure vessels and can be easily applied for mass production of nanoporous silicon materials for lithium-ion battery or for other applications.

SUBMITTER: Wang F

PROVIDER: S-EPMC6554372 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature

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Ionothermal Synthesis of Crystalline Nanoporous Silicon and Its Use as Anode Materials in Lithium-Ion Batteries.

Wang Fei F Zhao Baoxun B Zi Wenwen W Du Hongbin H

Nanoscale research letters 20190606 1

Silicon has great potential as an anode material for high-performance lithium-ion batteries (LIBs). This work reports a facile, high-yield, and scalable approach to prepare nanoporous silicon, in which commercial magnesium silicide (Mg<sub>2</sub>Si) reacted with the acidic ionic liquid at 100 °C and ambient pressure. The obtained silicon consists of a crystalline, porous structure with a BET surface area of 450 m<sup>2</sup>/g and pore size of 1.27 nm. When coated with the nitrogen-doped carbon ...[more]

PMID: 31172310

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