Fabrication of Si/N-doped carbon nanotube composite via spray drying followed by catalytic chemical vapor deposition

Kim, Hye Min; Shin, Seongmin; Jung, Dae Soo; Kim, Jung Hyun

doi:10.1016/j.jallcom.2023.168743

Cited by 6 publications

(3 citation statements)

References 57 publications

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“…Figure 4a−f shows the core-level deconvoluted XPS spectra for C 1s, O 1s, and Si 2p of the as-prepared samples (m-PSi and m-GPSi). The primary C 1s spectrum at 284.39 eV (as seen in Figure 4a) splits into the sp 2 and sp 3 44 A plausible mechanism for the PVP thermolysis is proposed in Figure S2, forming a phenolic-carbon-grafted Si surface. The para-substituted hydroxyl groups in PVP promote the formation of phenolic carbon radicals during thermal depolymerization.…”

Section: Postmortem Sei Layer Analysis By Atr-ftirmentioning

confidence: 99%

“…1,2 However, there are several prominent challenges that impede its widespread commercial adoption, including significant volume expansion (∼400%), limited electrical conductivity, formation of an unstable solid electrolyte interface (SEI) layer, and a sluggish Li + ion diffusion rate. 3 To overcome these obstacles, porous silicon (PSi) has been identified as an alternative solution that exhibits exceptional ability to accommodate volume changes and enhance Li + ion diffusion, leading to improved cyclic performance. 4 However, the stability of the PSi interface remains paramount for mitigating side reactions and unlocking the full capacity.…”

Section: Introductionmentioning

confidence: 99%

“…Silicon has emerged as a promising contender for next-generation anode materials owing to its high theoretical capacity of 4200 mA h g –1 (Li 3.75 Si), moderate working potential, and high natural abundance. , However, there are several prominent challenges that impede its widespread commercial adoption, including significant volume expansion (∼400%), limited electrical conductivity, formation of an unstable solid electrolyte interface (SEI) layer, and a sluggish Li + ion diffusion rate . To overcome these obstacles, porous silicon (PSi) has been identified as an alternative solution that exhibits exceptional ability to accommodate volume changes and enhance Li + ion diffusion, leading to improved cyclic performance .…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Lithium Storage in Micro-Si-Based Anode Materials through Low-Temperature Interface Engineering with an Ultrathin Phenolic Interlayer

Naikwade,

Lee,

Salunkhe

et al. 2024

ACS Appl. Energy Mater.

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Silicon (Si) anode materials show tremendous potential for high-energy Li-ion batteries (LIBs) due to their excellent theoretical capacity. However, critical issues like initial capacity loss, unstable solid electrolyte interface (SEI) formation, and volume changes during cycling have hindered their practical application. To address these challenges, we have developed a resilient Si interface for rapid Li + ion transport while maintaining Si structural integrity. Herein, we utilized microsized porous silicon (m-PSi) coated with an ultrathin phenolic interlayer from lowtemperature thermolysis of poly(4-vinylphenol) (PVP). This PVPderived phenolic carbon is covalently linked to the Si surface, creating a strong Si interface and a pathway for Li + ion transport. The grafted m-PSi (m-GPSi) anode shows an impressive initial capacity of 3134 mA h g −1 with a capacity retention of 80.0% after 100 cycles at 0.1 A g −1 . Moreover, it demonstrated a superior rate performance of 1270 mA h g −1 at 4 A g −1 with a recovery rate of 96% at 0.1 A g −1 . These results surpass state-of-the-art microsized Si anodes, primarily due to the covalently interfaced ultrathin phenolic interlayer, consequently enhancing Li + ion conductivity, mechanical strength, and stable SEI formation during the LIB operation. This research offers a convenient interface engineering strategy to enhance the Si anode performance for next-generation LIBs.

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Section: Postmortem Sei Layer Analysis By Atr-ftirmentioning

confidence: 99%