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

Haidar Y. Alolaywi, Kubra Uzun, Yang Tse Cheng

Research output: Contribution to journalArticlepeer-review

Abstract

LiNi0.6Mn0.2Co0.2O2 (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.

Original languageEnglish
Article number010514
JournalJournal of the Electrochemical Society
Volume171
Issue number1
DOIs
StatePublished - 2024

Bibliographical note

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

Keywords

  • energy density
  • Li-ion battery
  • porosity
  • thickness

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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