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Silicon@porous nitrogen-doped carbon spheres through a bottom-up approach are highly robust lithium-ion battery anodes

Cited 74 time in Web of Science Cited 76 time in Scopus

Jeong, Hyung Mo; Lee, Su Yeon; Shin, Weon Ho; Kwon, Jun Ho; Shakoor, Abdul; Hwang, Tae Hoon; Kim, Se Yun; Kong, Byung-Seon; Seo, Jin-Seok; Lee, Yong Min; Kang, Jeung Ku; Choi, Jang Wook

Issue Date
Royal Society of Chemistry
RSC Advances, Vol.2 No.10, pp.4311-4317
Due to its excellent capacity, around 4000 mA h g(-1), silicon has been recognized as one of the most promising lithium-ion battery anodes, especially for future large-scale applications including electrical vehicles and utility power grids. Nevertheless, Si suffers from a short cycle life as well as limitations for scalable electrode fabrication. Herein, we report a novel design for highly robust and scalable Si anodes: Si nanoparticles embedded in porous nitrogen-doped carbon spheres (NCSs). The porous nature of NCSs buffers the volume changes of Si nanoparticles and thus resolves critical issues of Si anode operations, such as pulverization, vulnerable contacts between Si and carbon conductors, and an unstable solid-electrolyte interphase. The unique electrode structure exhibits outstanding performance with a gravimetric capacity as high as 1579 mA h g(-1) at a C/10 rate based on the mass of both Si and C, a cycle life of 300 cycles with 94% capacity retention, as well as a discharge rate capability of 6 min while retaining a capacity of 702 mA h g(-1). Significantly, the coulombic efficiencies of this structure reach 99.99%. The assembled structure suggests a design principle for high capacity alloying electrodes that suffer from volume changes during battery operations.
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Related Researcher

  • College of Engineering
  • School of Chemical and Biological Engineering
Research Area Carbon nanotube, Graphene, Lithium-ion battery, Lithium-sulfur battery, Silicon anode


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