Jump to main content
Jump to site search


Direct monitoring of trace water in Li-ion batteries using operando fluorescence spectroscopy

Author affiliations

Abstract

The direct monitoring of trace water in real time during electrochemical cycles is of vital importance because water impurities are one of the causes of reduced lifetimes and capacity fading in Li-ion batteries. However, the most common Karl-Fischer titration lacks the ability to perform real-time monitoring of trace water while the battery is operating. Here, we demonstrate the use of nanosized coordination polymers as a sensing platform for the rapid and highly sensitive detection of water molecules, which gives a distinguishable turn-on fluorescence (FL) response toward water with a quantifiable detection range from 0 to 1.2% v/v, offering a novel opportunity to monitor trace water during electrochemical cycles. To demonstrate the practical value of our platform, we designed an in situ measurement system using nanosized coordination polymers as an electrolyte additive. Within the platform, the findings indicate that trace water is indeed generated during the first discharge process, in which the FL intensity shows a linear increase over time along with the gradual formation of water. We believe that this strategy provides new insights into the in situ monitoring of complex electrochemical processes, and it may help to pave the way for the development of new operando analytical techniques for lithium-ion batteries.

Graphical abstract: Direct monitoring of trace water in Li-ion batteries using operando fluorescence spectroscopy

Back to tab navigation

Supplementary files

Publication details

The article was received on 21 Jul 2017, accepted on 20 Oct 2017 and first published on 23 Oct 2017


Article type: Edge Article
DOI: 10.1039/C7SC03191B
Citation: Chem. Sci., 2018, Advance Article
  • Open access: Creative Commons BY license
  •   Request permissions

    Direct monitoring of trace water in Li-ion batteries using operando fluorescence spectroscopy

    X. Ren, J. Wang, Z. Peng and L. Lu, Chem. Sci., 2018, Advance Article , DOI: 10.1039/C7SC03191B

    This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material.

    Reproduced material should be attributed as follows:

    • For reproduction of material from NJC:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
    • For reproduction of material from PCCP:
      [Original citation] - Published by the PCCP Owner Societies.
    • For reproduction of material from PPS:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
    • For reproduction of material from all other RSC journals:
      [Original citation] - Published by The Royal Society of Chemistry.

    Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.

Search articles by author

Spotlight

Advertisements