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Facilitated ion diffusion in multiscale porous particles: application in battery separators
Young Bum Kim1, Thanh Tran-Phu, Min Kim
1School of Chemical Engineering and ‡SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University , Suwon 440-746, Republic of Korea.
ACS Applied Materials & Interfaces
|January 17, 2015
Summary
Composite separators with hierarchical pore structures enhance lithium-ion battery safety and performance. These novel inorganic nanoparticle coatings improve ion transport while maintaining thermal and mechanical stability.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Polyethylene (PE) separators are standard in lithium-ion batteries due to their properties.
- PE separators exhibit poor thermal stability, leading to safety concerns.
- Inorganic nanoparticle integration offers a potential solution to enhance PE separator performance.
Purpose of the Study:
- To develop advanced composite separators for lithium-ion batteries.
- To improve the thermal stability and ionic conductivity of polymer separators.
- To investigate the effect of hierarchical pore structures in inorganic nanoparticles on battery performance.
Main Methods:
- Coating conventional polymer separators with inorganic nanoparticles featuring hierarchical pore structures.
- Comparing the performance of composite separators with those using mesopore-only or nonporous nanoparticles.
- Evaluating electrolyte uptake, ionic conductivity, thermal stability, and mechanical properties.
Main Results:
- The composite separator with hierarchical pores showed significantly improved lithium ion transportation.
- Synergistic effects of mesopores and macropores enhanced electrolyte uptake and ionic conductivity.
- The composite separator maintained the desirable thermal and mechanical properties of the original polymer separator.
Conclusions:
- Composite separators with hierarchical inorganic nanoparticles offer superior performance for lithium-ion batteries.
- This approach effectively addresses the thermal stability limitations of conventional PE separators.
- The synergistic pore structure is key to enhanced ionic transport and overall battery safety.
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