Advanced Energy Materials
Advanced Energy Materials
5 years ago

Silicon Composite Electrodes with Dynamic Ionic Bonding

Silicon Composite Electrodes with Dynamic Ionic Bonding
Scott R. White, Ke Yang, Sen Kang, Nancy R. Sottos
Silicon (Si) composite electrodes are developed with increased cycle lifetimes and reliability through dynamic ionic bonding between active Si nanoparticles and a polymer binder. Amine groups are covalently attached to Si nanoparticles via surface functionalization. Si composite electrodes are fabricated by combining the Si nanoparticles with a poly(acrylic acid) (PAA) binder. The formation of ionic bonds between amine groups on Si particles and carboxylic acid groups on the PAA binder is characterized by X-ray photoelectron spectroscopy and Raman spectroscopy. Si composite anodes with ionic bonding demonstrate long term cycling stability with capacity retention of 80% at 400 cycles at a current density of 2.1 A g−1 and good rate capability. The dynamic ionic bonds effectively mitigate the deterioration of electrical interfaces in the composite anodes as suggested by stable impedance over 300 cycles. Dynamic ionic bonding is successfully incorporated into silicon-based lithium-ion battery anodes to increase cycle lifetimes and reliability. The formation of amine–carboxylate ionic bonding upon mixing amine functionalized Si nanoparticles with poly(acrylic acid) binder is confirmed by X-ray photoelectron spectroscopy and Raman spectroscopy. The dynamic ionic bonds effectively mitigate the deterioration of electrical interfaces resulting in longer cycling stability with 80% capacity retention after 400 cycles.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/aenm.201700045

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.