A highly efficient surface modified separator fabricated with atmospheric atomic layer deposition for high temperature lithium ion batteries

A highly efficient surface modified separator fabricated with atmospheric atomic layer deposition for high temperature lithium ion batteries

Summary A high throughput mass production of separator is proposed using a well‐established unique in‐house process of roll‐to‐roll atmospheric atomic layer deposition. An ultra‐thin conformal layer of Al2O3 is deposited over the commercial Celgard (PE/PP/PE) using multi‐slit gas source head. Overal...

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Bibliographic Details
Published in:International journal of energy research Vol. 44; no. 8; pp. 7035 - 7046
Main Authors: Lee, Jae‐Wook, Soomro, Afaque Manzoor, Waqas, Muhammad, Khalid, Muhammad A. U., Choi, Kyung H.
Format: Journal Article
Language:English
Published: Chichester, UK John Wiley & Sons, Inc 25-06-2020
Hindawi Limited
Subjects:
Al2O3
Aluminum oxide
Atomic layer epitaxy
Batteries
Capacity
Cells
Cobalt
Cobalt oxides
Deposition
Discharge
Electrochemistry
Emission spectra
Fabrication
Field emission microscopy
Graphite
High temperature
Lithium
Lithium-ion batteries
Low temperature
Mass production
Photoelectrons
Porosity
R2R‐AALD
Rechargeable batteries
Retention
Scanning electron microscopy
separator
Separators
Thermal stability
Wettability
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Summary:Summary A high throughput mass production of separator is proposed using a well‐established unique in‐house process of roll‐to‐roll atmospheric atomic layer deposition. An ultra‐thin conformal layer of Al2O3 is deposited over the commercial Celgard (PE/PP/PE) using 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 90°C. The high thermal stability of as‐modified separator is achieved at of 180°C. The separator was analyzed using 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 80°C). A high throughput mass production of separator is proposed for LiBs using a well‐established unique in‐house process of roll‐to‐roll atmospheric atomic layer deposition (R2R‐AALD).
Bibliography:Funding information
Jae‐Wook Lee and Afaque Manzoor Soomro contributed equally to this study.
Ministry of Trade, Industry and Energy, Grant/Award Number: 10063277; National Research Foundation, Grant/Award Number: NRF‐2020R1A2B3001830
ISSN:0363-907X
1099-114X
DOI:10.1002/er.5371