Design considerations for fast charging lithium ion cells for NMC/MCMB electrode pairs

William Yourey, Yanbao Fu, Ning Li, Vincent Battaglia, Wei Tong

Research output: Contribution to journalArticlepeer-review

Abstract

Lithium ion cells that can be quickly charged are of critical importance for the continued and accelerated penetration of electric vehicles (EV) into the consumer market. Considering this, the U.S. Department of Energy (DOE) has set a cell recharge time goal of 10–15 min. The following study provides an investigation into the effect of cell design, specifically negative to positive matching ratio (1.2:1 vs. 1.7:1) on fast charging performance. By using specific charging procedures based on negative electrode performance, as opposed to the industrial standard constant current constant voltage procedures, we show that the cells with a higher N:P ratio can be charged to ~16% higher capacity in the ten-minute time frame. Cells with a higher N:P ratio also show similar cycle life performance to those with a conventional N:P ratio, despite the fact that these cells experience a much higher irreversible capacity loss, leading to a lower reversible specific capacity.

Original languageEnglish (US)
Article number4
Pages (from-to)1-11
Number of pages11
JournalBatteries
Volume7
Issue number1
DOIs
StatePublished - Mar 2021

All Science Journal Classification (ASJC) codes

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

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