5 years ago

Mechanisms for Lithium Nucleation and Dendrite Growth in Selected Carbon Allotropes

Mechanisms for Lithium Nucleation and Dendrite Growth in Selected Carbon Allotropes
Wenquan Lu, David J. Gosztola, Xin Su, Jan Ilavsky, Victor A. Maroni, Fulya Dogan
Using information gained from parallel investigations on lithiated/over-lithiated graphite and hard carbon, we propose two different processes for lithium nucleation and dendrite growth in the carbon allotropes based on their different crystal structures. In the case of graphite, lithium nucleation and initial growth of lithium dendrites occur inhomogeneously on the graphite surfaces during the over-lithiation process, which exposes lithium nucleation to the electrolyte causing formation of a large amount of electrolyte degradation products (EDPs) and knob-like dendrites covered with a thick lithium electrolyte interphase (LEI). However, in the case of hard carbon, lithium nucleation and initial growth occur inside the hard carbon nanopores, which limits side reactions, provides a higher capacity (∼550 mA h/g vs ∼370 mA h/g for graphite), and generates dendrites with smooth clean surfaces during the over-lithiation process. These findings could profoundly influence the overall electrode design, the improvement of performance, and the inherent safety of carbon-based electrodes for lithium ion batteries.

Publisher URL: http://dx.doi.org/10.1021/acs.chemmater.7b00072

DOI: 10.1021/acs.chemmater.7b00072

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.