Surface Modified Separator for Li-Ion Batteries

Surface Modified Separator for Li-Ion Batteries

A high throughput mass production of the separator is proposed using a well-established unique in-house process of roll-to-roll atmospheric atomic layer deposition. An ultrathin conformal layer of Al2O3 is deposited over the commercial Celgard (PE/PP/PE) using a multi-slit gas source head. Overall 10 nm increase is incurred in the thickness while maintaining the porosity to ~48%. The entire process of fabrication was performed at very low temperature of 90C.

The high thermal stability of an as-modified separator is achieved at of 180 oC. The separator was analyzed using an X-ray photoelectron spectrometer, electrochemical impedance spectra, and field emission scanning electron microscope. The as-developed separator showed excellent wettability due to the surface medication in addition to robust flexibility, high conformity, and minimal
thermal shrinkage. The Lithium cobalt oxide (LCO)/Graphite cells with atomic layer deposition (ALD) Celgard (Al2O3 deposited) separator delivered remarkable discharge capacity with 79.5% capacity retention after 100 cycles at 1 C as compared to the uncoated-separator(Celgard separator), which yielded relatively less retention of ~70%. Moreover, the LCO/Graphite cells with the ALD-Celgard separator delivered the discharge capacity of 140 mAh/g at elevated temperature (up to 80C).

 

 

 

Journal- Journal Of International Energy Research

Impact Factor- 3.343

DOI-10.1016/j.sna.2019.05.021

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