Operando X-ray Diffraction Study of Polycrystalline and Single-Crystal LixNi0.5Mn0.3Co0.2O2. Issue 13 (29th September 2017)

• Record Type: Journal Article
• Authors: Weber, Rochelle; Fell, Christopher R.; Dahn, J. R.; Hy, Sunny
• Is Part Of: Journal of the Electrochemical Society. Volume 164:Issue 13(2017)
• Page Start: A2992
• Page End: A2999
• Publication Date: 2017-09-29
• Subjects: diffusion -- irreversible capacity -- NMC532 -- operando -- polycrystalline -- single crystal -- volume changes -- x-ray diffraction; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0441713jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Pouch cells made with single-crystal Lix Ni0.5 Mn0.3 Co0.2 O2 positive electrodes have recently shown superior capacity retention over equivalent pouch cells made with polycrystalline Lix Ni0.5 Mn0.3 Co0.2 O2 . 1 This paper aims to further understand the cycling behavior of polycrystalline and single-crystal Lix Ni0.5 Mn0.3 Co0.2 O2 through an operando X-ray diffraction study, which reveals identical trends in lattice parameter evolution and unit cell volume change during cycling for the two materials. In addition, coin-cell cycling experiments used to examine the initial irreversible capacity loss observed for both materials indicate that it is primarily caused by kinetic limitations of lithium intercalation. Additional X-ray diffraction experiments show much higher c -lattice preferred orientation for electrodes made from single-crystal material, and SEM images of the electrodes reveal a shearing effect in single-crystal particles caused by electrode calendaring.