Nanoscale chemical mapping of Li-ion battery cathode material by FIB-SEM and TOF-SIMS multi-modal microscopy

Tan Sui, Bohang Song, Jiri Dluhos, Li Lu, Alexander M. Korsunsky

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

Lithium ion batteries are a leading energy storage technology for electronic portable devices and hybrid electric vehicles. A long-standing challenge to understand Li ion transport is the fact that this light atom escapes direct detection by X-ray techniques (EDX, XRD and XAS) due to weak scattering and emission properties. Simultaneous characterisation of the structure, chemical composition (including Li) and elemental distribution in Li-ion battery materials can reveal the relationship between Li ion transport and structural effects (phase transformation, internal stress), and battery performance and degradation. Nanoscale mapping is achieved by multi-modal correlative microscopy combining focused ion beam and scanning electron microscopy (FIB-SEM) with Time-of-Flight Secondary Ion Mass Spectrometry (TOF-SIMS). Mapping Li, Mn and Co nanoscale distributions reveals the micro-structural consequences of the electrochemical reaction, and allows identifying Li "trapping" sites within the structure that control materials properties, and open the way towards designing better Li-ion cathode materials with superior performance.

Original languageEnglish
Pages (from-to)254-260
Number of pages7
JournalNano Energy
Volume17
DOIs
Publication statusPublished - 1 Oct 2015
Externally publishedYes

Keywords

  • Correlative microscopy
  • EDX
  • FIB-SEM/TOF-SIMS
  • Li-ion battery

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