• Rathore, Divya
• Yu, Haifeng
• Murphy, Aidan
• Dahn, Jeff
• Kim, Chang-Yong
• Leontowich, Adam
• Yu, Svena

Abstract

<jats:title>Abstract</jats:title><jats:p>Nickel-rich layered positive electrode materials are normally made by a “co-precipation-sintering” method.Mixed transition metal hydroxides called “precursors” are prepared by co-precipitation to ensure homogenious cation mixing at the atomic level and to create spherical particles which ensure high performance poly-crystalline materials.Single crystal materials, which show better capacity retention in long term cycling can be made from the same mixed transition metal hydroxide precursors by sintering at a higher temperature which inevitably destroys the spherical morphology present in the initial precursors.Here we describe a method for single crystal positive electrode material production which we call “all-dry synthesis” since it does not require the use of any liquid and creates no waste unlike the co-precipitation method.The exemplary reaction between Ni, MnCO3 and LiOH·H2O was studied in-situ by synchrotron XRD in order to define a proper heating scheme for the all-dry process.The crystal structure, particle morphology, surface residual impurities, and electrochemical performance of materials prepared by the “all-dry synthesis” method are equivalent or even better than those of materials made using a conventional co-precipitation method.</jats:p>

Topics

• surface
• single crystal
• nickel
• x-ray diffraction
• layered
• precipitation
• sintering