“Zero” Porosity High Loading NMC622 Positive Electrodes for Li-Ion Batteries

Authors

Haidar Y. Alolaywi, University of KentuckyFollow
Kubra Uzun, University of KentuckyFollow
Yang-Tse Cheng, University of KentuckyFollow

Abstract

LiNi0.6 Mn0.2Co0.2 O 2 (NMC622) is a widely used positive electrode material for lithium-ion batteries, including electric vehicles. In this work, we investigated the effects of porosity, ranging from “zero” to the typical 35%, on the electrochemical behavior of high- loading NMC622 electrodes. Although it is well known that the energy density of the electrode increases with increasing areal capacity and decreasing porosity, NMC-positive electrodes with exceedingly low porosity (e.g., near zero) and high loading (e.g., 4 mAh cm−2 ) have not been investigated. Here, we report an intriguing observation that the “zero porosity” NMC electrode can have higher capacity at low C-rates, and the volumetric energy density significantly increases to 1739 Wh l−1 compared to 805 Wh l−1 of conventional electrodes of 35% porosity. We performed cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) to help understand this observation. This work provides new insights into the effects of porosity on the electrochemical behavior of high-loading positive electrodes

Document Type

Article

Publication Date

1-2024

Notes/Citation Information

© 2024 The Electrochemical Society (“ECS”). Published on behalf of ECS by IOP Publishing Limited.

Digital Object Identifier (DOI)

https://doi.org/10.1149/1945-7111/ad1a20

Funding Information

The financial support for this project was provided by General Motors and the University of Kentucky.

Repository Citation

Alolaywi, Haidar Y.; Uzun, Kubra; and Cheng, Yang-Tse, "“Zero” Porosity High Loading NMC622 Positive Electrodes for Li-Ion Batteries" (2024). Chemical and Materials Engineering Faculty Publications. 110.
https://uknowledge.uky.edu/cme_facpub/110