10-16 June 2018
Dalhousie University
America/Halifax timezone
Welcome to the 2018 CAP Congress Program website! / Bienvenue au siteweb du programme du Congrès de l'ACP 2018!

POS-22 What is the use of a lithium-ion battery that has zero volts?

12 Jun 2018, 18:00
1h 30m
SUB McInnes Hall (Dalhousie University)

SUB McInnes Hall

Dalhousie University

Oral (Graduate Student) / Orale (Étudiant(e) du 2e ou 3e cycle) Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) DCMMP Poster Session & Finals: Poster Competition and Mingle Session with Industry Partners (28) / Employers | Session d'affiches DPMCM et finales: Concours d'affiches et rencontres avec partenaires industriels et employeurs (28)

Speaker

Yulong Liu (Dalhousie University)

Description

Normal Li-ion cells with a positive electrode and a negative electrode normally have a voltage near 4.0 V. There are many surprising things about lithium-ion cells. One of these is that unwanted chemical reactions between one charged electrode (say the positive) and the electrolyte can create reaction products that migrate to the other electrode (say the negative) and affect it dramatically [1,2]. In order to eliminate this “cross-talk”, “symmetric” cells, which have two positive (or two negative electrodes) electrodes and hence an average voltage of zero, are used [3,4]. The charge discharge cycle performance of a symmetric cell is exclusively determined by the compatibility of the electrode of interest with the electrolyte of choice.

In this study, the compatibility of various electrolyte additives with Li[Ni0.6Mn0.2Co0.2]O2 positive electrodes were studied using positive-positive symmetric cells built in-house. Symmetric cell testing is a method to effectively evaluate materials made in an academic laboratory when machine-made electrodes and full Li-ion cells are not readily available.

  1. A. J. Smith et al, J. Electrochem. Soc., 158, A1136 (2011)
  2. E. Björklund et al J. Electrochem. Soc., 164, A3054–A3059 (2017)
  3. D. J. Xiong et al., J. Electrochem. Soc., 164, A340–A347 (2017)
  4. C. Shen et al., J. Electrochem. Soc., 164, A3349–A3356 (2017)

Primary author

Yulong Liu (Dalhousie University)

Co-author

Prof. Jeff Dahn (Dalhousie University)

Presentation Materials

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