Hollow Porous SiO2 Nanocubes Towards High-performance Anodes for Lithium-ion Batteries

Yan, Nan; Wang, Fang; Zhong, Hao; Li, Yan; Wang, Yu; Hu, Lin; Chen, Qianwang

doi:10.1038/srep01568

Cited by 385 publications

(328 citation statements)

References 42 publications

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“…The wide-angle XRD pattern of m-SiO2 shows a broad peak around 21 o , revealing its amorphous nature. 28 For Co-Al LDH, all diffraction peaks can be indexed as Co-Al LDH. [29][30] The broadened diffraction peaks of Co-Al LDH indicate that the synthetic sample is composed of nanocrystals.…”

Section: Characterization Of M-sio2@co-al Ldhmentioning

confidence: 99%

Synthesis of Mesoporous Silica@Co–Al Layered Double Hydroxide Spheres: Layer-by-Layer Method and Their Effects on the Flame Retardancy of Epoxy Resins

Jiang

Bai

Tang

et al. 2014

ACS Appl. Mater. Interfaces

151

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Hierarchical mesoporous silica@Co–Al layered double hydroxide (m-SiO2@Co–Al LDH) spheres were prepared through a layer-by-layer assembly process, in order to integrate their excellent physical and chemical functionalities. TEM results depicted that, due to the electrostatic potential difference between m-SiO2 and Co–Al LDH, the synthetic m-SiO2@Co–Al LDH hybrids exhibited that m-SiO2 spheres were packaged by the Co–Al LDH nanosheets. Subsequently, the m-SiO2@Co–Al LDH spheres were incorporated into epoxy resin (EP) to prepare specimens for investigation of their flame-retardant performance. Cone results indicated that m-SiO2@Co–Al LDH incorporated obviously improved fire retardant of EP. A plausible mechanism of fire retardant was hypothesized based on the analyses of thermal conductivity, char residues, and pyrolysis fragments. Labyrinth effect of m-SiO2 and formation of graphitized carbon char catalyzed by Co–Al LDH play pivotal roles in the flame retardance enhancement.

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Section: Characterization Of M-sio2@co-al Ldhmentioning

confidence: 99%

Synthesis of Mesoporous Silica@Co–Al Layered Double Hydroxide Spheres: Layer-by-Layer Method and Their Effects on the Flame Retardancy of Epoxy Resins

Jiang

Bai

Tang

et al. 2014

ACS Appl. Mater. Interfaces

151

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“…Moreover, huge volume changes influence the mechanical stress of the electrode seen as degradation of the solid electrolyte interphase (SEI) layer and further capacity fading [6]. Recently, the silicon oxide nanostructures were tested as an alternative anode material for lithium batteries [5,9,32,40]. Silica is one of the most commonly occurring matters on Earth.…”

Section: Introductionmentioning

confidence: 99%

“…Silica as an anode material exhibits a high theoretical capacity of about 1965 mAh g −1 and is known to undergo faradaic processes in the presence of lithium ions at a sufficiently high cathodic potential. Yan et al expressed the mechanism on the basis of HRTEM and SAED data as follows [40]:…”

Section: Introductionmentioning

confidence: 99%

“…2SiO 2 + 4Li + + 4e − → Li 4 SiO 4 + Si (4) Above electrochemical reactions of SiO 2 can be the source of a high theoretical capacity, significantly higher than the capacity of LiC 6 [40]. Formation of disilicate in reaction (1), as also silicon lithiation (reaction (2)), are reversible; however, reactions (3) and (4) are found to be irreversible.…”

Section: Introductionmentioning

confidence: 99%

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Biosilica from sea water diatoms algae—electrochemical impedance spectroscopy study

Nowak

Lisowska-Oleksiak

Wicikowska

et al. 2017

J Solid State Electrochem

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Here, we report on an electrochemical impedance study of silica of organic origin as an active electrode material. The electrode material obtained from carbonized marine biomass containing nanoporous diatoms has been characterised by means of XRD, IR, SEM and EIS. Different kinds of crystallographic phases of silica as a result of thermal treatment have been found. The electrode is electrochemically stable during subsequent cyclic voltammetry measurements taken in the potential range from 0.005 up to 3.0 V vs. Li/Li + . The material has been found to exhibit high charge capacitance of 521 mAh g −1 being cycled at a rate C/20 with capacity retention of about 97%. Electrochemical impedance spectroscopy performed at an equilibrated potential E = 0.1 V in the temperature range 288-294 K discloses low charge transfer resistivity and low diffusional impedance.

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“…Al2O3 is usually considered as electrochemically inactive and is often used as coating materials for cathode [35][36]. The observed peaks from the HMMT electrode do not match with the redox peaks for possible reactions between SiOx and lithium ions from other's researches [37][38][39][40][41]. When compared to the other layered materials, such as graphite, it is possible that the redox peaks could could correspond to the reversible intercalation/deintercalation of lithium ions in the different layers of MMT with charge transfer process at the electrode/electrolyte interface [42].…”

Section: Resultsmentioning

confidence: 95%

Advanced Electrode Materials by Electrostatic Spray Deposition for Li-ion Batteries

Chen¹

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Recent development in portable electronics and electric vehicles have increased the demand for high performance lithium ion batteries. However, it is still challenging to produce high energy and high power lithium ion batteries. The major objective of this research is to fabricate advanced electrode materials with enhanced power density and energy density. Porous Li4Ti5O12 (LTO) and its nanocomposites (with Si and reduced graphene oxide (rGO)) synthesized by electrostatic spray deposition (ESD) technique were mainly studied and promising electrochemical performance was achieved.In chapter 3, porous LTO thin film electrode was synthesized by ESD to solve the low energy density and low power density issues by providing good ionic and electronic conductivities. Electrochemical test results showed that it had a large specific capacity of 357 mAh g -1 at 0.15 A g -1 , which was even higher than its theoretical capacity. It also exhibited very high rate capability of 98 mAh g -1 at 6 A g -1 . The improved electrochemical performance was due to the advantage of ESD generated porous structures. In order to further enhance the power density of LTO, ESD derived LTO/rGO composite electrodes were studied in chapter 4. In chapter 5, high energy density component Si was introduced viii into LTO composite. The synergistic effect between commercial LTO and Si powder was studied. Then, ESD derived LTO/Si/rGO composite was prepared and evaluated. At 0.15 A g -1 , a stable capacity of 624 mAh g -1 was observed, which was much higher than the capacities of LTO and LTO/rGO electrodes. In addition, effect of activation process on electrochemical performance of carbon nanofibers (ACNFs) and feasibility of ion intercalation into 2D MMT montmorillonite clay (MMT) were studied and discussed in chapter 6.In summary, we have successfully synthesized various LTO based electrodes by ESD. Both high energy and high power density were achieved as compared to commercial LTO electrode. Through electrochemical characterization and charge storage distribution analysis, origins of the high rate capability were proposed. This work demonstrates ESD as a powerful tool for fabricating high performance porous structures and nanocomposite electrode materials.

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Hollow Porous SiO2 Nanocubes Towards High-performance Anodes for Lithium-ion Batteries

Cited by 385 publications

References 42 publications

Synthesis of Mesoporous Silica@Co–Al Layered Double Hydroxide Spheres: Layer-by-Layer Method and Their Effects on the Flame Retardancy of Epoxy Resins

Synthesis of Mesoporous Silica@Co–Al Layered Double Hydroxide Spheres: Layer-by-Layer Method and Their Effects on the Flame Retardancy of Epoxy Resins

Biosilica from sea water diatoms algae—electrochemical impedance spectroscopy study

Advanced Electrode Materials by Electrostatic Spray Deposition for Li-ion Batteries

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