Fabrication of porous SiOx/nanoSi@C composites with homogeneous silicon distribution for high-performance Li-ion battery anodes

Hong, Feng; Zhou, Ruxuan; Gao, Chenyu; Liu, Yishao; Sun, Zhenjie; Jiang, Yang

doi:10.1016/j.jallcom.2023.169511

Cited by 8 publications

(3 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Si 2p XPS spectrum of pristine SiO x electrode exhibits continuous distribution of broad characteristic peaks from 99.58 eV to 103.39 eV, corresponding to the typical valence states 0, +2, and +4 of SiO x , respectively (Figure 5c). [ 53‐54 ] The significant shift to lower energy levels of the Si 2p signal after prelithiation and the emergence of the new peak at 101.16 eV for the lithiation product Li x SiO y confirm the lithiation of SiO x . [ 55‐56 ] Further prelithiation product Li x Si peak is also noted in the 0.5 T‐5 min electrode.…”

Section: Resultsmentioning

confidence: 97%

Efficient Chemical Prelithiation with Modificatory Li⁺ Solvation Structure Enabling Spatially Homogeneous SEI toward High Performance SiO_x Anode^†

Wang,

Wu,

Niu

et al. 2024

Chin. J. Chem.

View full text Add to dashboard Cite

Comprehensive SummaryChemical prelithiation is widely proven to be an effective strategy to address the low initial coulombic efficiency (ICE) of promising SiOx anode. Though the reagent composition has been widely explored, the Li+ solvation structure, which practically plays the cornerstone role in the prelithiation ability, rate, uniformility, has rarely been explored. A novel environmentally‐friendly reagent with weak solvent cyclopentyl methyl ether (CPME) is proposed that enables both improved ICE and spatial homogeneous solid electrolyte interphase (SEI). And the prelithiation behavior and mechanism were explored focused on the Li+ solvation structure. Both theoretical investigation and spectroscopic results suggest that weak solvent feature of CPME reduces the solvent coordination number and decreases the Li+ desolvation energy. The optimized Li+ solvation structure enables high‐efficiency prelithiation that ensures the horizontal homogenization and mechanical properties of SEI. Moreover, the accompanied CPME molecules preferentially occupy positions in initial SEI, reducing the likelihood of LiPF6 decomposition and promoting longitudinal homogenization of SEI. Consequently, the efficient and homogenous prelithiation enables impressive ICE of 109.52% and improved cycling performance with 80.77% retained after 300 cycles via just 5 min soaking. Furthermore, the full cells with LiNi0.83Co0.12Mn0.05O2 (NCM831205) cathode display an enhancement in the energy density of 179.74% and up to 648.35 Wh·kg–1.

show abstract

Section: Resultsmentioning

confidence: 97%

Efficient Chemical Prelithiation with Modificatory Li⁺ Solvation Structure Enabling Spatially Homogeneous SEI toward High Performance SiO_x Anode^†

Wang,

Wu,

Niu

et al. 2024

Chin. J. Chem.

View full text Add to dashboard Cite

show abstract

“…4(b), the beginning of the formation of a large reduction peak was observed around 1.0 V in the first cathodic scan, which may be related to the irreversible reaction occurring in the contact between the electrolyte and the electrode surface as well as the formation of the SEI film at the interface of the stabilized solid electrolyte, and the disappearance of the peaks in the following cycles further demonstrated this deduction. 14,34,45,46 Another reduction peak near 0 V is typically associated with an internal alloying reaction between Si and Li + . In contrast, two anodic peaks occur at 0.34 V and 0.51 V, mainly due to the de-lithiation of the composite.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and performance of Ti₂O₃/LiTiO₂ decorated micro-scale Si-based composite anode materials for Li-ion batteries

Wang,

Ma,

Cai

et al. 2024

CrystEngComm

View full text Add to dashboard Cite

show abstract

“…In addition, the formation of a stable carbon layer on the surface of particles can not only effectively limits the volume expansion of the particles and promotes electron/ion transport, but also prevent direct contact between the particles and the electrolyte, further generating a stable SEI layer on the surface [21]. Feng and coworkers prepared SiO x /nanoSi@C composites by vaporphase magnesium thermal reduction method [22]. The volume expansion effect was prevented by the porous SiO x matrix, and after 400 cycles at a present density of 1 A g −1 , the reversible capacity was 1067.92 mA h g −1 .…”

Section: Introductionmentioning

confidence: 99%

Design of SiO _x /TiO₂@C hierarchical structure for efficient lithium storage

Zou,

Yuan,

Huang

et al. 2023

Nanotechnology

View full text Add to dashboard Cite

The large volume expansion effect and unstable SEI films of SiOx-based anode materials have hindered their commercial development. It has been shown that composite doping is a general strategy to solve critical problems. In this study, TiO2-doped core-shell SiOx/TiO2@C composites were created using the sol-gel method. On the one hand, the uniformly dispersed TiO2 nanoparticles can alleviate the volume expansion of the SiOx active material during the lithiation process. On the other hand, they can react with Li+ to form LixTiO2, thereby increasing the ion diffusion rate in the composite material. The outer carbon shell acts as a protective layer that not only alleviate the volume expansion of the composite, but also improve the electron migration rate of the composite. The prepared SiOx/TiO2@C composite has a reversible capacity of 828.2 mA h g-1 828.2 mA h g-1 (0.2 A g-1 100 cycles). After 500 cycles, it still maintains a reversible capacity of 500 mA h g-1 even at a high current density of 2 A g-1. These findings suggest that SiOx/TiO2@C composites have a bright future in applications.

show abstract

Fabrication of porous SiOx/nanoSi@C composites with homogeneous silicon distribution for high-performance Li-ion battery anodes

Cited by 8 publications

References 49 publications

Efficient Chemical Prelithiation with Modificatory Li⁺ Solvation Structure Enabling Spatially Homogeneous SEI toward High Performance SiO_x Anode^†

Efficient Chemical Prelithiation with Modificatory Li⁺ Solvation Structure Enabling Spatially Homogeneous SEI toward High Performance SiO_x Anode^†

Synthesis and performance of Ti₂O₃/LiTiO₂ decorated micro-scale Si-based composite anode materials for Li-ion batteries

Design of SiO _x /TiO₂@C hierarchical structure for efficient lithium storage

Contact Info

Product

Resources

About

Fabrication of porous SiOx/nanoSi@C composites with homogeneous silicon distribution for high-performance Li-ion battery anodes

Cited by 8 publications

References 49 publications

Efficient Chemical Prelithiation with Modificatory Li+ Solvation Structure Enabling Spatially Homogeneous SEI toward High Performance SiOx Anode†

Efficient Chemical Prelithiation with Modificatory Li+ Solvation Structure Enabling Spatially Homogeneous SEI toward High Performance SiOx Anode†

Synthesis and performance of Ti2O3/LiTiO2 decorated micro-scale Si-based composite anode materials for Li-ion batteries

Design of SiO x /TiO2@C hierarchical structure for efficient lithium storage

Contact Info

Product

Resources

About

Efficient Chemical Prelithiation with Modificatory Li⁺ Solvation Structure Enabling Spatially Homogeneous SEI toward High Performance SiO_x Anode^†

Efficient Chemical Prelithiation with Modificatory Li⁺ Solvation Structure Enabling Spatially Homogeneous SEI toward High Performance SiO_x Anode^†

Synthesis and performance of Ti₂O₃/LiTiO₂ decorated micro-scale Si-based composite anode materials for Li-ion batteries

Design of SiO _x /TiO₂@C hierarchical structure for efficient lithium storage