Subnanoscopically and homogeneously dispersed SiOx/C composite spheres for high-performance lithium ion battery anodes

Han, Meisheng; Yu, Jie

doi:10.1016/j.jpowsour.2019.01.030

Cited by 63 publications

(59 citation statements)

References 37 publications

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“…The structures of the SiO x /C spheres were further tested using X‐ray diffraction (XRD) and Raman spectroscopy. As shown in Figure a, all the XRD patterns of the SiO x /C spheres derived from DMD, OMCT, DMT, and OMT present a broad peak centered at 23°–27°, which are the characteristics of an amorphous structure . Furthermore, the diffraction peak shifts toward higher diffraction angle with a decrease in the oxygen content from 10.53 to 5.41 at% in the precursors (Table S1, Supporting Information).…”

Section: Resultsmentioning

confidence: 92%

“…The first discharge and charge capacities of the SiO 0.59 /C spheres are 1935.0 and 1486.1 mAh g −1 , respectively, corresponding to an ICE of about 76.8%. The 23.2% capacity loss is ascribed to the formation of the SEI layer, Li 2 O, and irreversible lithium silicate . A long potential plateau (below 0.1 V) is observed in the first lithiation, which arises from the alloying reaction between silicon and Li ions .…”

Section: Resultsmentioning

confidence: 99%

“…Interestingly, these liquids were all converted into solid spheres after heating in the sealed vessels (Figure and Figure S1, Supporting Information). Obviously, high vapor pressure generated in the sealed vessels by heating the liquid precursors drives the formation of the spheres . If heating in an open crucible at atmospheric pressure, these liquid precursors evaporated, and no solid products were obtained because of their low boiling point (Table ).…”

Section: Resultsmentioning

confidence: 99%

“…However, the result is opposite (Table S3, Supporting Information). The capacity increase should result from the corresponding increase in the unsaturated Si atoms as the reversible capacity of SiO x is from alloying and dealloying of Si . The ICE increases gradually, which is ascribed to the increase in the size of the sphere and the decrease in the O content of the sphere.…”

Section: Resultsmentioning

confidence: 99%

“…However, LIBs still face the problem of low energy density. One limiting factor is the low capacity of the graphite anode . Therefore, searching for new anode materials is of great significance for developing advanced LIBs.…”

Section: Introductionmentioning

confidence: 99%

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Pressure‐Induced Vapor Synthesis of Carbon‐Encapsulated SiO_x/C Composite Spheres with Optimized Composition for Long‐Life, High‐Rate, and High‐Areal‐Capacity Lithium‐Ion Battery Anodes

Han

2019

Energy Tech

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SiOx exhibits a high specific capacity as anode materials for lithium‐ion batteries. However, it is still a challenge to achieve long life, high rate performance, and high areal capacity for the SiOx materials. Herein, carbon‐encapsulated SiOx/C composite spheres are prepared by a high pressure caused by heating SiOx/C spheres in pure dimethylformamide in a sealed vessel. The SiOx/C spheres with different compositions are synthesized by pyrolysis of different liquid siloxanes and hexamethyldisilane in a sealed vessel and subsequent heat treatment. The electrochemical performances are strongly dependent on the composition of the SiOx/C spheres. The specific capacity and initial coulombic efficiency (ICE) greatly increase, and cyclability slightly decreases with a decrease in the x value from 1.28 to 0.59. However, the capacity, ICE, and cyclability greatly decrease with a further decrease in the x value because of the formation of SiC. The carbon‐encapsulated SiO0.59/C spheres exhibit a high reversible capacity (1561.3 mAh g−1), an outstanding cyclability (0.0332% capacity loss per cycle during 500 cycles at 1 A g−1), a good rate performance (245.3 mAh g−1 at 10 A g−1), and a high areal capacity (4.08 mAh cm−2). Formation of the spherical morphology and carbon‐encapsulating layers is a result of the high vapor pressure generated at a high temperature.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pressure‐Induced Vapor Synthesis of Carbon‐Encapsulated SiO_x/C Composite Spheres with Optimized Composition for Long‐Life, High‐Rate, and High‐Areal‐Capacity Lithium‐Ion Battery Anodes

Han

2019

Energy Tech

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Challenges and Progress in Rechargeable Magnesium‐Ion Batteries: Materials, Interfaces, and Devices

Wang,

Zhang,

Hao

et al. 2024

Adv Funct Materials

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Rechargeable magnesium‐ion batteries (RMBs) have garnered increasing research interest in the field of post‐lithium‐ion battery technologies owing to their potential for high energy density, enhanced safety, cost‐effectiveness, and material resourcefulness. Despite substantial advancements in RMB research, a number of intrinsic challenges remain unresolved, such as the strong Coulombic interaction between Mg2+ and the host crystal structure of cathode materials, sluggish Mg2+ diffusion kinetic, poor electrolyte compatibility, and the formation of passivation films on the Mg anode interface. These issues hinder the commercial applications of RMBs. This review provides a comprehensive overview of the progress in key areas of RMB research, including representative magnesium‐ion storage cathode/anode materials and magnesium‐ion conducting electrolytes. Additionally, recent developments in electrode‐electrolyte interface regulations and pouch‐cell fabrication are outlined, highlighting current challenges and the implementation of effective solutions. Finally, future research directions are proposed to guide the development of high‐performance RMBs with practical applications.

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Constructing the Single‐Phase Nanotubes with Uniform Dispersion of SiOx and Carbon as Stable Anodes for Lithium‐Ion Batteries

Gao

Peng

Guan

2022

Chemistry An Asian Journal

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SiOx is an attractive anode material for lithium‐ion batteries due to its considerable capacity. However, its obvious volume expansion and low conductivity result in poor electrochemical performance. Herein, a novel single‐phase nanotube structure with uniform distribution of nanoscale SiOx units and amorphous carbon matrix was fabricated. The hollow nanotube and homogeneously distributed ultrafine SiOx units greatly alleviate volume changes. The amorphous carbon facilitates electron transport throughout the network and offers a buffer to further reduce the volume expansion of SiOx. Benefiting from this unique structure, as‐prepared single‐phase SiOx/C NTs demonstrate excellent durability and rate capability. Specifically, it delivers a high reversible specific capacity (713 mAh g−1 at 0.1 A g−1 after 200 cycles); negligible capacity decay is confirmed after 500 cycles at high density current (544 mAh g−1 at 1 A g−1 after 500 cycles).

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Subnanoscopically and homogeneously dispersed SiOx/C composite spheres for high-performance lithium ion battery anodes

Cited by 63 publications

References 37 publications

Pressure‐Induced Vapor Synthesis of Carbon‐Encapsulated SiO_x/C Composite Spheres with Optimized Composition for Long‐Life, High‐Rate, and High‐Areal‐Capacity Lithium‐Ion Battery Anodes

Pressure‐Induced Vapor Synthesis of Carbon‐Encapsulated SiO_x/C Composite Spheres with Optimized Composition for Long‐Life, High‐Rate, and High‐Areal‐Capacity Lithium‐Ion Battery Anodes

Challenges and Progress in Rechargeable Magnesium‐Ion Batteries: Materials, Interfaces, and Devices

Constructing the Single‐Phase Nanotubes with Uniform Dispersion of SiOx and Carbon as Stable Anodes for Lithium‐Ion Batteries

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Subnanoscopically and homogeneously dispersed SiOx/C composite spheres for high-performance lithium ion battery anodes

Cited by 63 publications

References 37 publications

Pressure‐Induced Vapor Synthesis of Carbon‐Encapsulated SiOx/C Composite Spheres with Optimized Composition for Long‐Life, High‐Rate, and High‐Areal‐Capacity Lithium‐Ion Battery Anodes

Pressure‐Induced Vapor Synthesis of Carbon‐Encapsulated SiOx/C Composite Spheres with Optimized Composition for Long‐Life, High‐Rate, and High‐Areal‐Capacity Lithium‐Ion Battery Anodes

Challenges and Progress in Rechargeable Magnesium‐Ion Batteries: Materials, Interfaces, and Devices

Constructing the Single‐Phase Nanotubes with Uniform Dispersion of SiOx and Carbon as Stable Anodes for Lithium‐Ion Batteries

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Product

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Pressure‐Induced Vapor Synthesis of Carbon‐Encapsulated SiO_x/C Composite Spheres with Optimized Composition for Long‐Life, High‐Rate, and High‐Areal‐Capacity Lithium‐Ion Battery Anodes

Pressure‐Induced Vapor Synthesis of Carbon‐Encapsulated SiO_x/C Composite Spheres with Optimized Composition for Long‐Life, High‐Rate, and High‐Areal‐Capacity Lithium‐Ion Battery Anodes