ChemElectroChem
ChemElectroChem
3 years ago

Structural-Defect-Controlled Electrochemical Performance of Sodium Ion Batteries with NaCrO2 Cathodes

Structural-Defect-Controlled Electrochemical Performance of Sodium Ion Batteries with NaCrO2 Cathodes
Monica Sawicki, Leon L. Shaw, Mei Luo, Angel L. Ortiz
In this study, we report the effects of structural defects on the electrochemical cycle stability of Na-ion batteries made of NaCrO2 cathodes. Three processing conditions are used to create NaCrO2 with different structural defects. One condition entails high-energy ball milling of reactants before the solid-state reaction at 900 °C, the second one has no high-energy ball milling but simple mixing of reactants before the solid-state reaction, and the last one has high-energy ball milling after the solid-state reaction. The NaCrO2 crystals derived from the process with high-energy ball milling of reactants before the solid-state reaction exhibit the best bulk conductivity and highest specific capacity with little capacity decay over 46 charge/discharge cycles. In contrast, the NaCrO2 crystals derived from the process without high-energy ball milling have significant capacity decay, whereas the NaCrO2 crystals obtained from the process with high-energy ball milling after the solid-state reaction exhibits the lowest bulk conductivity and very low specific capacities. The different electrochemical properties exhibited by these NaCrO2 crystals have been ascribed to different extents of structural defects present in these crystals. This study unambiguously demonstrates that structural defects in NaCrO2 crystals are critical in achieving NaCrO2 electrodes with high specific capacity and excellent capacity retention. The cycle stability of NaCrO2 half cells depends strongly on structural defects in the NaCrO2 crystal which is shown to be controllable through high-energy ball milling (BM) before and after the high-temperature synthesis reaction. The near-perfect NaCrO2 crystal derived from the process with high-energy BM of reactants before the synthesis reaction (i. e., the BM-Before cell) exhibits the highest specific capacity and best capacity retention.

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

DOI: 10.1002/celc.201700764

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.