Practical high temperature (80 °C) storage study of industrially manufactured Li-ion batteries with varying electrolytes

R. Genieser, M. Loveridge, R. Bhagat

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A previous study is focused on high temperature cycling of industrially manufactured Li-ion pouch cells (NMC-111/Graphite) with different electrolytes at 80 °C [JPS 373 (2018) 172–183]. Within this article the same test set-up is used, with cells stored for 30 days at different open circuit potentials and various electrolytes instead of electrochemical cycling. The most pronounced cell degradation (capacity fade and resistance increase) happens at high potentials. However appropriate electrolyte formulations are able to suppress ageing conditions by forming passivating surface films on both electrodes. Compared with electrochemical cycling at 80 °C, cells with enhanced electrolytes only show a slight resistance increase during storage and the capacity fade is much lower. Additionally it is shown for the first time, that the resistance is decreasing and capacity is regained once these cells are cycled again at room temperature. This is not the case for electrolytes without additives or just vinylene carbonate (VC) as an additive. It is further shown that the resistance increase of cells with the other electrolytes is accompanied by a reduction of the cell volume during further cycling. This behaviour is likely related to the reduction of CO2 at the anode to form additional SEI layer components.

Original languageEnglish
Pages (from-to)85-95
Number of pages11
JournalJournal of Power Sources
Volume386
Early online date23 Mar 2018
DOIs
Publication statusPublished - 15 May 2018
Externally publishedYes

Keywords

  • Cell swelling
  • Electrolyte additive
  • Elevated temperature
  • Gas consumption
  • Li-ion battery
  • Storage

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Practical high temperature (80 °C) storage study of industrially manufactured Li-ion batteries with varying electrolytes'. Together they form a unique fingerprint.

  • Cite this