3 years ago

ε- and β-LiVOPO4: Phase Transformation and Electrochemistry

ε- and β-LiVOPO4: Phase Transformation and Electrochemistry
M. Stanley Whittingham, Fredrick Omenya, Fengxia Xin, Hui Zhou, Yong Shi
ε- and β-LiVOPO4 were synthesized from the same precursor at different temperatures in an air atmosphere. ε-LiVOPO4 is obtained at 400 and 700 °C. The 700 °C sample has better purity and crystallinity, but the 400 °C sample has a little better electrochemical performance due to its smaller particle size and the conducting carbon residue in the sample. β-LiVOPO4 is formed between the above two temperatures, which gives slightly lower capacity than that of the ε-LiVOPO4 sample, indicating higher kinetics of the lithium reaction for the ε phase than those of the β one. The phase transformation from ε to β then back reversibly to ε was also observed by ex situ X-ray diffraction. This thermal study verifies that ε-LiVOPO4 is the more stable phase for LiVOPO4; however, reaction kinetics control the phases formed at lower temperatures.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b07895

DOI: 10.1021/acsami.7b07895

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.