Bulk and surface structural changes in high nickel cathodes subjected to fast charging conditions

Tianyi Liu; Zhijia Du; Xianyang Wu; Muhammad Mominur Rahman; Dennis Nordlund; Kejie Zhao; Michael D. Schulz; Feng Lin; David L. Wood; Ilias Belharouak

doi:10.1039/D0CC02579H

Bulk and surface structural changes in high nickel cathodes subjected to fast charging conditions†

Tianyi Liu,^ab Zhijia Du,

*^a Xianyang Wu,^ac Muhammad Mominur Rahman,^b Dennis Nordlund,^d Kejie Zhao,^c Michael D. Schulz,

^b Feng Lin,

^b David L. Wood, III

^ae and Ilias Belharouak*^ae

Author affiliations

* Corresponding authors

^a Energy and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
E-mail: duz1@ornl.gov, belharouaki@ornl.gov
Tel: +1-865-574-7519

^b Department of Chemistry, Virginia Tech, Blacksburg, VA 24061, USA

^c School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA

^d Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA

^e Bredesen Center for Interdisciplinary Research and Graduate Education, University of Tennessee, Knoxville, TN 37996, USA

Abstract

A layered oxide cathode, LiNi_0.6Mn_0.2Co_0.2O₂, undergoes noticeable crystal expansion by losing significantly higher amounts of Li⁺ at the end of fast charging cycles. However, the bulk structure of the cycled NMC622 is restored back to its pristine discharged state when intercalated with enough lithium ions during an electrochemical process.

Chemical Communications

Bulk and surface structural changes in high nickel cathodes subjected to fast charging conditions†

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Bulk and surface structural changes in high nickel cathodes subjected to fast charging conditions

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