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Garnet-PVDF composite film modified lithium manganese oxide cathode and sulfurized carbon anode from polyacrylonitrile for lithium-ion battery

Abstract

Lithium manganese oxide (LMO) is one of the most promising cathode material for lithium-ion batteries. However, the dissolution of manganese and its deposition on anode surface cause poor cycling stability. To alleviate these issues, a film composed of polyvinylidene difluoride (PVDF) and Li5.6Ga0.26La2.9Zr1.87Nb0.05O12 type garnet (PVDF@LGLZNO) is coated directly on the LMO electrode and it functions as a promising artificial cathode-electrolyte interphase (CEI). The film thickness is optimized concerning the electrospinning-processing time. To realize a cell with good capacity retention, excellent rate capability and resilience under harsher conditions (e.g. elevated temperature or high rates), the coated LMO cathode is coupled with a new anode which consists of sulfurized carbon derived from polyacrylonitrile (S-C(PAN)). The electrode (LMO-30min) coated with PVDF@LGLZNO composite material shows outstanding cycling stability and rate capability, as well as capacity retention when compared to bare electrode both at room temperature (25 °C) and elevated temperature (55 °C). The PVDF@LGLZNO fibrous film coating suppresses the dissolution of manganese both at high C-rates and 55 °C, as supported by XPS, whereas PVDF coated and bare LMO cathodes are not able to prevent the further deterioration of themselves. The film significantly minimizes undesirable side reactions at the cathode-electrolyte interface and reduces charger transfer resistance. The new cell with PVDF@LGLZNO (LMO-30min) modified cathode and S-C(PAN) anode delivers capacity retention of 77% after 1000 cycles at 1 C, corresponding to the average capacity decay of 0.023% per cycle.

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Supplementary files

Article information


Accepted
23 Jun 2020
First published
24 Jun 2020

J. Mater. Chem. A, 2020, Accepted Manuscript
Article type
Paper

Garnet-PVDF composite film modified lithium manganese oxide cathode and sulfurized carbon anode from polyacrylonitrile for lithium-ion battery

G. B. Berhe, W. Su, L. H. Abrha, H. K. Bezabh, T. M. Hagos, T. T. Hagos, C. Huang, N. A. Sahalie, B. A. Jote, B. Thirumalraj, D. Kurniawan, C. Wang and B. J. Hwang, J. Mater. Chem. A, 2020, Accepted Manuscript , DOI: 10.1039/D0TA05392A

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