Interfacial nitrogen stabilizes carbon-coated mesoporous silicon particle anodes

Han, Xiang; Chen, Huixin; Li, Xin; Wang, Jianyuan; Li, Cheng; Chen, Songyan; Yang, Yong

doi:10.1039/c5ta08297h

Cited by 37 publications

(15 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hassan et al used Si–sulfur–graphene to develop a robust hierarchical nanoarchitecture, which prevented agglomeration of Si, stabilized the electrode and SEIs, leading to a superior reversible capacity of over 1000 mA h g −1 for 2275 cycles at 2 A g −1 . Han et al prepared mesoporous Si particles encapsulated in the interfacial Si–N–C layer to enhance interactions between Si and carbon as well as to form a stable SEI layer, which resulted in a high electrochemical performance . Sun et al showed that by tailoring the Si–carbon interface with atomic oxygen, the cycle life of Si/C composite electrodes can be improved by 300% even at high mass loadings …”

Section: Introductionmentioning

confidence: 99%

Controlling Surface Oxides in Si/C Nanocomposite Anodes for High‐Performance Li‐Ion Batteries

Zheng

Xiang

et al. 2018

Advanced Energy Materials

Self Cite

218

105

View full text Add to dashboard Cite

electric vehicles. [1] The next-generation LIBs must meet a multitude of stringent requirements, including excellent cycle stability, high capacity, high energy and power densities, high safety, and low cost. [2] As an alternative to the graphite anode for commercial LIBs, Si has attracted considerable attention, due to its high theoretical capacity of 3579 mA h g −1 , low operating potential, abundance, and low cost. However, the practical applications of Si-based anode materials are hindered by low Li + diffusivity and electrical conductivity and especially by drastic volume changes (≈300%) during lithiation/delithiation. The latter problem can cause Si pulverization, loss of electrical contact, and consumption of active Li associated with the unstable evolution of solid electrolyte interphases (SEIs). As a result, Si-based anodes generally exhibit low Coulombic efficiency, poor cycle stability, and rate capability. [3] To address these problems, one effective approach is to use Si nanoparticles (NPs) for the facile accommodation of large volume changes. But the high specific surface area associated with nanomaterials causes aggregation of Si NPs during cycling and provides plenty of active surface sites to form SEIs. Moreover, repeated expansion and contraction of Si NPs induce fracture and uncontrolled formation of Si/C composites represent one promising class of anode materials for next-generation lithium-ion batteries. To achieve high performances ofSi-based anodes, it is critical to control the surface oxide of Si particles, so as to harness the chemomechanical confinement effect of surface oxide on the large volume changes of Si particles during lithiation/delithiation. Here a systematic study of Si@SiO x /C nanocomposite electrodes consisting of Si nanoparticles covered by a thin layer of surface oxide with a tunable thickness in the range of 1-10 nm is reported. It is shown that the oxidation temperature and time not only control the thickness of the surface oxide, but also change the structure and valence state of Si in the surface oxide. These factors can have a strong influence on the lithiation/delithiation behavior of Si nanoparticles, leading to different electrochemical performances. By combining experimental and modeling studies, an optimal thickness of about 5 nm for the surface oxide layer of Si nanoparticles is identified, which enables a combination of high capacity and long cycle stability of the Si@SiO x /C nanocomposite anodes. This work provides an in-depth understanding of the effects of surface oxide on the Si/C nanocomposite electrodes. Insights gained are important for the design of high-performance Si/C composite electrodes.

show abstract

Section: Introductionmentioning

confidence: 99%

Controlling Surface Oxides in Si/C Nanocomposite Anodes for High‐Performance Li‐Ion Batteries

Zheng

Xiang

et al. 2018

Advanced Energy Materials

Self Cite

218

105

View full text Add to dashboard Cite

show abstract

“…In addition, the higher discharge plateau indicates the less polarization of Si/MoSi 2 electrode. 42 directly, while the Si/MoSi 2 electrode could still maintained a reversible capacity of ~550 mAh g -1 . When the current density was returned back to 0.1C after high rate test, the capacities of both electrodes resumed.…”

Section: Resultsmentioning

confidence: 99%

“…This phenomenon can be ascribed to an activation process during the first several cycles. In addition, the higher discharge plateau indicates less polarization of the Si/MoSi 2 electrode. , As a result, the existence of MoSi 2 particles has positive effects on the electrical conductivity of electrodes. Cycling performance of bare Si and Si/MoSi 2 electrodes tested at a rate of 0.2 C was provided in Figure e.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Electrochemical Performance of Heterogeneous Si/MoSi₂ Anodes Prepared by a Magnesiothermic Reduction

Yang

Zhou

et al. 2016

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

This work explores facile synthesis of heterogeneous Si/MoSi2 nanocomposites via a one-step magnesiothermic reduction. MoSi2 serves as a highly electrically conductive nanoparticle that has several advantages of electrochemical properties, which is formed through the absorption of local heat accumulation generated by magnesiothermic reduction. As a result, the Si/MoSi2 nanocomposites exhibit excellent electrochemical performance, showing initial charge capacity of 1933.9 mA h g(-1) at a rate of 0.2 C and retaining 85.2% after 150 cycles. This work using local heat accumulation generated by magnesiothermic reduction demonstrates a large-scale method for producing high-performance Si-based anode materials, which could provide referential significances for other materials.

show abstract

“…The atomic radius similar to carbon and the electron‐rich nature makes N‐doped carbon exhibit lots of unique electronic properties from the pure carbon . Multifarious N‐containing precursors such as polypyrrole (PPy), polydopamine (PDA), and polyacrylonitrile (PAN) are widely used as nitrogen‐containing carbon coating layers on Si‐based materials . In this section, we will briefly introduce the preparation of the above mentioned three types coating materials as well as their applications in Si/C composite anode materials.…”

Section: Nitrogen Dopingmentioning

confidence: 99%

Interface Heteroatom‐doping: Emerging Solutions to Silicon‐based Anodes

Zhang

Luo

Yang

2020

Chemistry An Asian Journal

View full text Add to dashboard Cite

Silicon-based composites have been recognized as a promising anode material for high-energy lithium-ion batteries (LIBs). However, the intrinsically low conductivity and the huge volume expansion during lithiation/delithiation progresses impede its further practical applications. In the past decades, numerous efforts have been made for surface and interface modification of Si-based anodes. Among these, doping of active materials with heteroatoms is one promising method to endow silicon many unmatched electrochemical properties. In this review, we focus on the effects of heteroatom doping on the interfacial properties of Si-based anodes, and some typical strategies for the interface doping are highlighted. We aim to give some reference for interfacial doping of Si-based anodes in LIBs. 2 3 4 5 6 7 8

show abstract

Interfacial nitrogen stabilizes carbon-coated mesoporous silicon particle anodes

Abstract: We report for the first time that the interfacial Si–N–C layer could stabilize the solid–electrolyte interphase of a cabon-coated mesoporous silicon particle anode and enable 100% capacity retention after 400 cycles at 0.1 A g−1.

Cited by 37 publications

References 40 publications

Controlling Surface Oxides in Si/C Nanocomposite Anodes for High‐Performance Li‐Ion Batteries

Controlling Surface Oxides in Si/C Nanocomposite Anodes for High‐Performance Li‐Ion Batteries

Enhanced Electrochemical Performance of Heterogeneous Si/MoSi₂ Anodes Prepared by a Magnesiothermic Reduction

Interface Heteroatom‐doping: Emerging Solutions to Silicon‐based Anodes

Contact Info

Product

Resources

About

Interfacial nitrogen stabilizes carbon-coated mesoporous silicon particle anodes

Abstract: We report for the first time that the interfacial Si–N–C layer could stabilize the solid–electrolyte interphase of a cabon-coated mesoporous silicon particle anode and enable 100% capacity retention after 400 cycles at 0.1 A g−1.

Cited by 37 publications

References 40 publications

Controlling Surface Oxides in Si/C Nanocomposite Anodes for High‐Performance Li‐Ion Batteries

Controlling Surface Oxides in Si/C Nanocomposite Anodes for High‐Performance Li‐Ion Batteries

Enhanced Electrochemical Performance of Heterogeneous Si/MoSi2 Anodes Prepared by a Magnesiothermic Reduction

Interface Heteroatom‐doping: Emerging Solutions to Silicon‐based Anodes

Contact Info

Product

Resources

About

Enhanced Electrochemical Performance of Heterogeneous Si/MoSi₂ Anodes Prepared by a Magnesiothermic Reduction