Al2O3/TiO2 coated separators: Roll-to-roll processing and implications for improved battery safety and performance

Parikh, Dhrupadkumar; Jafta, Charl; Prasad Thapaliya, Bishnu; Sharma, Jaswinder; Meyer III, Harry; Silkowski, Chris; Li, Jianlin

doi:10.1016/j.jpowsour.2021.230259

Title: Al₂O₃/TiO₂ coated separators: Roll-to-roll processing and implications for improved battery safety and performance

Journal Article · Thu Jul 22 00:00:00 EDT 2021 · Journal of Power Sources

DOI:https://doi.org/10.1016/j.jpowsour.2021.230259· OSTI ID:1813221

Parikh, Dhrupadkumar ^[1];

^[2];

^[2]; Silkowski, Chris ^[3];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Navitas Advanced Solution Group, Ann Arbor, MI (United States)

Heat generation is one of the major concerns with lithium-ion batteries (LIB) while charging them at higher currents, which could inadvertently impact the rate performance and reduce the safety of the cell. Polymer separator is one of the least thermal conductive components of a LIB. In addition, commercial separators for LIB are made from polyolefin membranes that tend to shrink and curl at higher temperatures due to their lower melting temperature (~130 °C). Developing separators with improved thermal stability and higher electrolyte uptake is essential for enhancing the safety as well as the performance of the LIB. In this work, a thin layer of ceramic coatings (Al₂O₃ and TiO₂) is applied on propylene (PP) membrane to improve the thermal stability and electrolyte affinity without compromising the rate performance. A slurry with 100% Al₂O₃ coated on the polypropylene separator exhibited the best improvement in thermal stability ( shrinkage of 0.6% vs 6.0% for uncoated membrane) and excellent rate performance with 92% capacity retention at 2C. The Al₂O₃ coated separator demonstrated excellent electrolyte wettability compared to the uncoated membrane. The cross-plane thermal conductivity of the ceramic coated separators is analyzed to understand their heat transfer behavior. The thermal conductivity of the separator is improved by ~3.2 times with the Al₂O₃ coating.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1813221

Alternate ID(s):: OSTI ID: 1815179

Journal Information:: Journal of Power Sources, Vol. 507; ISSN 0378-7753

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

25 ENERGY STORAGE
ceramic coated separators
thermal conductivity
thermal stability
roll-to-roll processing
Al2O3 and TiO2

Title: Al2O3/TiO2 coated separators: Roll-to-roll processing and implications for improved battery safety and performance

Citation Formats

References (49)

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Related Subjects

Title: Al₂O₃/TiO₂ coated separators: Roll-to-roll processing and implications for improved battery safety and performance