4.8 Article

Enabling Long-Cycling Life of Si-on-Graphite Composite Anodes via Fabrication of a Multifunctional Polymeric Artificial Protective

期刊

ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 34, 页码 38824-38834

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c10175

关键词

silicon-on-graphite composite; high-capacity anode; polymer coating; artificial SEI; long-cycling life

资金

  1. Federal Ministry of Education and Research (BMBF) [03XP0133B, 03XP0133C, 03XP0340B]
  2. Projekttrager Julich (PTJ) [03XP0133B, 03XP0133C, 03XP0340B]
  3. Advanced Research Center for Green Materials Science and Technology from The Featured Area Research Center Program by the Ministry of Education [110L9006]
  4. Ministry of Science and Technology in Taiwan [MOST 1092634-F-002-042, MOST-110-2221-E-002 -015 -MY3, -109-2923-E-011-008]

向作者/读者索取更多资源

In this study, a multifunctional polymeric artificial solid-electrolyte interphase (A-SEI) protective layer was developed on carbon-coated Si@Gr anode particles to solve the long cycling stability challenge of Si@Gr composites. The coating made of sulfonated chitosan (SCS) was found to enhance ionic conduction and mechanical strength, leading to a superior long cycle life performance of the anodes.
The energy density of lithium-ion batteries (LIBs) can be meaningfully increased by utilizing Si-on-graphite composites (Si@Gr) as anode materials, because of several advantages, including higher specific capacity and low cost. However, long cycling stability is a key challenge for commercializing these composites. In this study, to solve this issue, we have developed a multifunctional polymeric artificial solid-electrolyte interphase (A-SEI) protective layer on carbon-coated Si@Gr anode particles (making Si@Gr/C-SCS) to prolong the cycling stability in LIBs. The coating is made of sulfonated chitosan (SCS) that is crosslinked with glutaraldehyde promoting good ionic conduction together with sufficient mechanical strength of the A-SEI. The focused ion beam-scanning electron microscopy and high-resolution transmission electron microscopy images show that the SCS is uniformly coated on the composite particles with thickness in nanometer. The anodes are investigated in Li metal cells Si@Gr/C-SCS||Li metal) and lithium-ion full-cells (LiNi0.6Co0.2Mn0.2O2 (NCM-622)||Si@Gr/C-SCS) to understand the material/electrode intrinsic degradation as well as the impact of the polymer coating on active lithium losses because of the continuous SEI (re)formation. The anode composites exhibit a high capacity reaching over 600 mAh g-1, and even without electrolyte optimization, the Si@Gr/C-SCS illustrates a superior long cycle life performance of up to 1000 cycles (over 67% capacity retention). The excellent long-term cycling stability of the anodes was attributed to the SCS polymer coating acting as the A-SEI. The simple polymer coating process is highly interesting in guiding the preparation of long-cycle-life electrode materials of high-energy LIB cells.

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