Journal
ELECTROCHIMICA ACTA
Volume 368, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.137644
Keywords
Li-ion battery; Controlled pyrolysis; 2D carbon fiber anode; Cycling performance; Post cycling analysis
Categories
Funding
- Italian Ministry of Economic Development
- EU's H2020 (RI) program [GA 730957]
- European Union's Horizon 2020 research and innovation program MODCOMP [685844]
- Ministry of Economic Affairs, Innovation, Digitalization, Energy of the State North Rhine-Westphalia in Germany (MWIDE NRW) [313-W044A]
- EU FP7 Project Functionalized Innovative Carbon Fibers Developed from Novel Precursors with Cost Efficiency and Tailored Properties (FIBRALSPEC) [604248]
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A self-standing and flexible Li-ion battery negative electrode made of interconnected two-dimensional carbonized cotton fibers was developed using a controlled pyrolysis method. The electrode showed excellent cycling performance and high discharge capacity in the voltage range of 0.02 - 1.2 V, making it a promising candidate for high-performance lithium-ion batteries at ambient temperature.
In this study, self-standing and flexible Li-ion battery negative electrodes made of interconnected two-dimensional carbonized cotton fibers are developed by using a controlled pyrolysis method, and their electrochemical performance in laboratory-scale lithium-based cells is investigated at ambient temperature. By applying this binder- and current collector-free cotton-based carbon fiber electrode, both the Li+-ion intercalation and capacity decay mechanisms are explored using conventional organic carbonate-based liquid electrolyte. The cotton-based carbon fiber electrode shows excellent cycling performance and delivers a high discharge capacity in the voltage range of 0.02 - 1.2 V. The post cycling analysis of carbon fiber using HR-TEM shows the major SEI layer components formed at the surface of the active fibers during the charge/discharge process. The same electrode is used to assemble a lab-scale Li-ion full cell with high mass loading LiFePO4-based composite electrode, which demonstrates excellent cycling stability, high Coulombic efficiency and remarkable rate capability at ambient temperature. (C) 2020 Elsevier Ltd. All rights reserved.
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