Determination of lithium ion transference numbers by electrophoretic nuclear magnetic resonance
- Los Alamos National Lab., NM (United States). Electronic Materials and Device Group
Lithium ion-conducting polymer electrolytes are of increasing interest for use in lithium-polymer batteries. For this application, it is highly desirable to achieve lithium ion transference numbers close to unity. Lithium ion transference numbers (T{sub Li}) have been determined for some aqueous gel electrolytes by electrophoretic NMR (ENMR). This method is essentially a rapidly detected Hittorf method, in which the positions of nuclei are labeled by the phase of the NMR signal and the mobility of the nuclei is determined from the phase shift of the signal in a stimulated echo experiment with a synchronized electric field pulse. The work presented is a proof-of-concept of the application of the ENMR method to lithium ion transference measurements for several different lithium salts in gelled electrolytes. The NMR method allows accurate determination of T{sub Li} values, as indicated by the similarity of T{sub Li} in the gelled electrolytes to those in aqueous electrolyte solutions of the same salt concentration.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 276612
- Journal Information:
- Journal of the Electrochemical Society, Vol. 143, Issue 6; Other Information: PBD: Jun 1996
- Country of Publication:
- United States
- Language:
- English
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