Morphology-Dependent Influences on the Performance of Battery Cells with a Hierarchically Structured Positive Electrode**

Johanna Naumann*, Nicole Bohn, Oleg Birkholz, Matthias Neumann, Marcus Müller, Joachim R. Binder, Marc Kamlah*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The rising demand for high-performing batteries requires new technological concepts. To facilitate fast charge and discharge, hierarchically structured electrodes offer short diffusion paths in the active material. However, there are still gaps in understanding the influences on the cell performance of such electrodes. Here, we employed a cell model to demonstrate that the morphology of the hierarchically structured electrode determines which electrochemical processes dictate the cell performance. The potentially limiting processes include electronic conductivity within the porous secondary particles, solid diffusion within the primary particles, and ionic transport in the electrolyte surrounding the secondary particles. Mitigating these limits requires an electronic conductivity in the active material of at least 10−4 S m−1 and a primary particle radius below 100 nm. Our insights enable a goal-oriented tailoring of hierarchically structured electrodes for high-power applications.

Original languageEnglish
Article numbere202300264
JournalBatteries & Supercaps
Volume6
Issue number12
DOIs
Publication statusPublished - 2023
Externally publishedYes

Keywords

  • battery performance
  • ceramics
  • continuum model
  • electrode morphology
  • mesoporous materials

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Electrochemistry

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