Investigating the Effect of Electrode Compositions on Dry-made NMC811 Positive Electrodes

Kubra Uzun, Haidar Alolaywi, Santosh Thapa, Bradley Frieberg, Ming Wang, Xiaosong Huang, Yang Tse Cheng

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Dry electrode manufacturing processes are appealing as they can potentially mitigate the economic and environmental consequences of traditional slurry techniques. Understanding the interactions among active material (AM), conductive agent, and binder in dry-made electrodes is crucial for achieving the desired electrode performance and durability. In this study, we conducted a comprehensive investigation of the effects of the different electrode formulations by altering the ratio of polyvinylidene fluoride (PVDF) binder and carbon black (CB) for LiNi0.8Mn0.1Co0.1O2 (NMC811) electrodes made using a dry coating process. Specifically, we examined four distinct electrode formulations: 96:3:1, 96:2:2, 90:7.5:2.5, and 90:5:5 (AM: PVDF: CB), equivalent to PVDF/CB mass ratios of 1:1 and 3:1. We found that a high PVDF content at PVDF/CB ratio of 3:1 provides high mechanical strength. However, the electrode ionic conductivity decreases due to the insulating aggregates of PVDF. The PVDF/CB ratio of 1:1 approaches the optimum ratio for balanced electronic and ionic conductivities and electrode mechanical strength, hence leading to enhanced electrochemical performance. For electrodes with the PVDF/CB ratio of 1:1, we observed surprisingly that electrode with higher AM content (e.g., 96%) showed a comparable C-rate and full-cell cycling performance to that with lower AM content (90%).

Original languageEnglish
Article number080532
JournalJournal of the Electrochemical Society
Volume171
Issue number8
DOIs
StatePublished - Aug 1 2024

Bibliographical note

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

Keywords

  • dry-made
  • electrostatic spray deposition
  • high loading
  • lithium-ion batteries
  • NMC811
  • ratio

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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