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Electrospun-nanofibrous Redox-active separator for enhancing the capacity of Lithium-ion batteries
- Release time:2023-01-30
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DOI number:
10.1016/j.ces.2022.117873Journal:
Chemical Engineering ScienceKey Words:
Redox-active separator；Lithium-ion battery；Nanofiber；Electrospinning；In-situ polymerizationAbstract:
Separator is a key component of lithium-ion battery (LIB), and a redox-active separator can enhance the capacity of LIB by participating in battery reactions. This paper reports a redox-active separator based on Fe(CN)64- doped polypyrrole (PPy) composite nanofibers fabricated by electrospinning and in-situ polymerization. The separator is composed of one layer of Polyacrylonitrile (PAN)@doped-PPy core–shell structured nanofibers and another layer of PAN nanofibers. The porosity, electrolyte uptake, and ionic conductivity of the optimized redox-active separator are 79.3 7.1%, 294.6 31.5%, and 1.57 0.06 mS∙cm−1, respectively. These values are greater than those of a commercial PP separator, 41%, 81.5 17.4%, and 0.75 0.02 mS∙cm−1, respectively. Accordingly, the discharge capacity of the battery cell with the redox-active separator is up to 158.7–227.0 mAh∙g−1 at the current rates of 2.0–0.2C, outperforming conventional inert separators. The enhanced battery capacity is stemmed from the redox activity of the doped-PPy polymer, as evidenced by the wider cathodic and anodic peaks in the cyclic voltammetry. In addition, the battery cells tested with redox-active separators show gravimetric energy densities of up to 103.0 mAh∙g−1, which is 56.1% and 27.2% greater than those of a commercial PP separator and the redox-active separator reported in the literature.Indexed by:
Journal paperDocument Code:
117873Volume:
260Translation or Not:
noDate of Publication:
2022-10-12Included Journals:
SCI、EILinks to published journals:
https://www.sciencedirect.com/science/article/pii/S0009250922004572