Effect of tab design on large-format Li-ion cell performance

Wei Zhao, Gang Luo, Chao Yang Wang

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

Large-format Li-ion batteries are essential for vehicle and grid energy storage. Today, scale-up of Li-ion cells has not maximized the potential of available battery materials, leading to much lower energy density than their coin cell benchmarks. In this work, a 3D computational methodology based on physical and electrochemical principles underlying Li-ion cells is developed for the design of large cells. We show a significant increase in the cell's usable energy density by minimizing voltage losses and maximizing the utilization of active materials in a large cell. Specifically, a class of designs using multiple current-collecting tabs are presented to minimize in-plane electron transport losses through long electrodes, thereby achieving nearly the same energy density in large-capacity cells as would be expected from battery materials used. We also develop a quantitative relation between the current density non-uniformity in a large-format cell and the cell's usable energy density, for the first time, in the literature.

Original languageEnglish (US)
Pages (from-to)70-79
Number of pages10
JournalJournal of Power Sources
Volume257
DOIs
StatePublished - Jul 1 2014

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All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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