In-situ observation of inhomogeneous degradation in large format Li-ion cells by neutron diffraction

Lu Cai, Ke An, Zhili Feng, Chengdu Liang, Stephen J. Harris

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Abstract

This work presents a non-destructive in-situ method for probing degradation mechanisms in large format, operating, commercial lithium-ion batteries by neutron diffraction. A fresh battery (15 Ah capacity) was shown to have a uniform (homogeneous) local state of charge (SOC) at 4.0 V (9 Ah SOC) and 4.2 V (15 Ah SOC), with 1.33 C and 2.67 C charging rates, respectively. This battery was then aggressively cycled until it retained only a 9 Ah capacity, 60% of its original value. Inhomogeneous deterioration in the battery was observed: near the edges, both the graphite anode and the spinel-based cathode showed a significant loss of capacity, while near the central area, both electrodes functioned properly. An SOC mapping measurement of the degraded battery in the fully charged state (4.2 V) indicated that the loss of local capacity of the anode and cathode is coupled.

Original languageEnglish
Pages (from-to)163-168
Number of pages6
JournalJournal of Power Sources
Volume236
DOIs
StatePublished - 2013

Funding

This research is supported by a Laboratory Directors R&D fund from ORNL . L.C., K.A. and C.L. acknowledge the support by the Division of Materials Sciences and Engineering, BES, DOE. This research benefitted from the use of SNS sponsored by the Division of Scientific User Facilities, BES, DOE . The authors thank Mr. H. D. Skorpenske for his technical support of neutron measurements.

Keywords

  • Degradation
  • Graphite
  • Inhomogeneous
  • Lithium-ion battery
  • Neutron diffraction
  • Spinel

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