Expandable crosslinked polymer coatings on silicon nanoparticle anode toward high-rate and long-cycle-life lithium-ion battery

Jeong Hoon Yoon, Gwanghyun Lee, Ping Li, Hionsuck Baik, Gi Ra Yi, Jong Hyeok Park

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Porous and electrically conductive coating on silicon nanoparticles (Si NPs) anode can mitigate the volume expansion during charging or discharging in Li-ion battery (LIB) while conventional protection coating process resulted in non-uniform polymer shell which show low volumetric or areal capacities. Here, we demonstrated that ultra-thin polyacrylonitrile layer can be formed conformally by emulsion-assisted coating process and cross-linked on Si NPs (Si@x-PAN) producing stable and expandable polymer shell which showed a highly stable long-term cycling ability. Areal and specific capacities of Si@x-PAN were an ∼ 2 mAh/cm2 and a 2000 mAh/g, respectively. Importantly, we found that capacity decay was only 5 % after 100 cycles and>75 % of capacity was retained even after 1000 cycles (0.5C/0.5C) with the help of a uniform Li-ion current around the Si NPs during continuous charging and discharging. To our knowledge, this long-term stability at reasonable loading levels is one of the highest levels of performance in pure Si anode systems.

Original languageEnglish
Article number151294
JournalApplied Surface Science
Publication statusPublished - 2022 Jan 1

Bibliographical note

Funding Information:
Prof. J. H. Park acknowledges the support from the Korea Institute of Energy Technology Evaluation and Planning ( KETEP ) and the Ministry of Trade, Industry & Energy ( MOTIE ) of the Republic of Korea (Nos. 20163010012450 and 20173010013340 ). G.-R. Yi acknowledges the support from the NRF of Korea (No. 2018M3D1A1058624).

Publisher Copyright:
© 2021 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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