Revisiting LiCoO2 Using a State-of-the-Art In Operando Technique
- 3 August 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in Inorganic Chemistry
- Vol. 59 (15), 11113-11121
- https://doi.org/10.1021/acs.inorgchem.0c01598
Abstract
Lithium overstoichiometric cobalt oxide, Li(Li delta Co1-delta)O2-delta, still occupies a privileged position as a positive electrode material for lithium-ion batteries. However, despite its widespread applications in commercial lithium-ion batteries, little is known about its reaction mechanisms and the effects of delta on cyclability at deep charge. We herein revisited this material through a recently developed in operando technique, i.e., rapid, alternating measurements of X-ray diffraction and X-ray absorption spectroscopy. The cyclability degraded when the charge cutoff voltage was >4.4 V versus Li+/Li, which corresponds to the Li composition exhibiting a minimum (maximum) lattice parameter along the a(h) (c(h)) axis. Differences in the structural parameters such as lattice parameters and bond distances clearly appeared between the charge and discharge reactions at a capacity below similar to 220 mAh g(-1). These changes occurred because deep charge and/or increasing the amount of delta induced a local distortion in the CoO6 octahedra. We found a critical Li extraction content that satisfied the need for both high capacity and cyclability for Li(Li delta Co1-delta)O2-delta, which can be applied to other layered materials.This publication has 40 references indexed in Scilit:
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