Advanced Materials
Advanced Materials
5 years ago

Rational Design of Na(Li1/3Mn2/3)O2 Operated by Anionic Redox Reactions for Advanced Sodium-Ion Batteries

Rational Design of Na(Li1/3Mn2/3)O2 Operated by Anionic Redox Reactions for Advanced Sodium-Ion Batteries
Duho Kim, Maenghyo Cho, Kyeongjae Cho
In an effort to develop high-energy-density cathodes for sodium-ion batteries (SIBs), low-cost, high capacity Na(Li1/3Mn2/3)O2 is discovered, which utilizes the labile O 2p-electron for charge compensation during the intercalation process, inspired by Li2MnO3 redox reactions. Na(Li1/3Mn2/3)O2 is systematically designed by first-principles calculations considering the Li/Na mixing enthalpy based on the site preference of Na in the Li sites of Li2MnO3. Using the anionic redox reaction (O2−/O−), this Mn-oxide is predicted to show high redox potentials (≈4.2 V vs Na/Na+) with high charge capacity (190 mAh g−1). Predicted cathode performance is validated by experimental synthesis, characterization, and cyclic performance studies. Through a fundamental understanding of the redox reaction mechanism in Li2MnO3, Na(Li1/3Mn2/3)O2 is designed as an example of a new class of promising cathode materials, Na(Li1/3M2/3)O2 (M: transition metals featuring stabilized M4+), for further advances in SIBs. Inspired by Li2MnO3 redox reactions, Na(Li1/3Mn2/3)O2 operated by anionic redox reactions (labile lone-pair O) is rationally designed based on the site preference of Na in the Li sites of Li2MnO3 for high-energy-density cathodes. Na(Li1/3Mn2/3)O2 shows high redox potentials (≈4.2 V vs Na/Na+) with high charge capacity (190 mAh g−1), utilizing O2−/O− anionic redox with the fixed Mn4+ during desodiation.

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

DOI: 10.1002/adma.201701788

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.