Electrochemical Stability of Carbon Fibers Compared to Aluminum as Current Collectors for Lithium-Ion Batteries
Source abstract
Abstract
The electrochemical behaviors of highly conductive, fully-graphitic, semi-graphitic and non-graphitic carbon fibers were studied as the cathode current collectors of lithium batteries in standard electrolyte (alkyl carbonate/LiPF 6 ) solutions and compared to bare aluminum (Al). All of these current collectors demonstrate a stable electrochemical behavior within the potential range of 2.5 to 5 V, due to passivation by surface films. Carbon fibers have comparable electrochemical stability of Al and may be used in place Al foil. While the carbon fibers do not contribute any irreversible or extra capacity when they are cycled below 4.5 V, for fully-graphitic and semi-graphitic fibers PF − 6 intercalation and deintercalation into the carbon fiber may occur when they are cycled at high potentials >4.5 V.
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Research context
OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Advanced Battery Technologies Research
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40. See supplementary material at http://dx.doi.org/10.1149/2.041210jes.html ecs for (Fig. S1) family of impedance spectra, represented as Nyquist plots of semi-graphitic fiber electrode at various equilibrium potentials as indicated vs. Li/Li+ reference electrode at 25°C; (Fig. S2a) the current density-time plots for fully-graphitic fiber electrodes at 3.0 V, 4.0 V, 4.5 V, 4.6 V, 5.0 V during chronoamperometry cycle in EC-DMC /LiPF6 solutions at 25°C; (Fig. S2b) CVs (scan rate = 10 mVs−1) measured with fully-graphitic fibers electrodes in the potential range between 2.5–5.0 V (between various potentials as indicated) in EC-DMC /LiPF6 solution at 25°C. The inset is the zoomed CV image of fully-graphitic fiber electrode in the potential range between 2.5–4.0V; Fig. S3. Family of impedance spectra, represented as Bode plots of fully-graphitic fiber electrode at various equilibrium potentials as indicated vs. Li/Li+ reference electrode at 25°C; Fig. S4. Family of impedance spectra, represented as Bode plots of non-graphitic fiber electrode at various equilibrium potentials as indicated vs. Li/Li+ reference electrode at 25°C.