Journalartikel

Jahr der Veröffentlichung: 2018

Seiten: 16706-16713

Zeitschrift: ACS Omega

Bandnummer: 3

Heftnummer: 12

ISSN: 2470-1343

Open Access Status: Gold

DOI Link: https://doi.org/10.1021/acsomega.8b02541

Verlag: American Chemical Society

Abstract: 
Silicon (Si) and composites thereof, preferably with carbon (C), show favorable lithium (Li) storage properties at low potential, and thus hold promise for application as anode active materials in the energy storage area. However, the high theoretical specific capacity of Si afforded by the alloying reaction with Li involves many challenges. In this article, we report the preparation of small-size Si particles with a turbostratic carbon shell from a polymer precoated powder material. Galvanostatic charge/discharge experiments conducted on electrodes with practical loadings resulted in much improved capacity retention and kinetics for the Si/C composite particles compared to physical mixtures of pristine Si particles and carbon black, emphasizing the positive effect that the core-shell-type morphology has on the cycling performance. Using in situ differential electrochemical mass spectrometry, pressure, and acoustic emission measurements, we gain insights into the gassing behavior, the bulk volume expansion, and the mechanical degradation of the Si/C composite-containing electrodes. Taken together, our research data demonstrate that some of the problems of high-content Si anodes can be mitigated by carbon coating. Nonetheless, continuous electrolyte decomposition, particle fracture, and electrode restructuring due to the large volume changes during battery operation (here, similar to 170% in the voltage range of 600-30 mV vs Li+/Li) remain as serious hurdles toward practical implementation.

Harvard-Zitierstil: Schiele, A., Breitung, B., Mazilkin, A., Schweidler, S., Janek, J., Gumbel, S., et al. (2018) Silicon Nanoparticles with a Polymer-Derived Carbon Shell for Improved Lithium-Ion Batteries: Investigation into Volume Expansion, Gas Evolution, and Particle Fracture, ACS Omega, 3(12), pp. 16706-16713. https://doi.org/10.1021/acsomega.8b02541

APA-Zitierstil: Schiele, A., Breitung, B., Mazilkin, A., Schweidler, S., Janek, J., Gumbel, S., Fleischmann, S., Burakowska-Meise, E., Sommer, H., & Brezesinski, T. (2018). Silicon Nanoparticles with a Polymer-Derived Carbon Shell for Improved Lithium-Ion Batteries: Investigation into Volume Expansion, Gas Evolution, and Particle Fracture. ACS Omega. 3(12), 16706-16713. https://doi.org/10.1021/acsomega.8b02541