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Jan Petter Mæhlen - One of the best experts on this subject based on the ideXlab platform.

  • Silicon-Carbon Composite anodes from industrial battery grade silicon
    Scientific Reports, 2019
    Co-Authors: Hanne Flåten Andersen, Carl Erik Lie Foss, Jorunn Voje, Ragnar Tronstad, Asbjørn Ulvestad, Martin Kirkengen, Tommy Mokkelbost, Per Erik Vullum, Jan Petter Mæhlen
    Abstract:

    In this work, silicon/Carbon Composites for anode electrodes of Li-ion batteries are prepared from Elkem’s Silgrain® line. Gentle ball milling is used to reduce particle size of Silgrain, and the resulting Si powder consists of micrometic Si with some impurities. Silicon/Carbon Composite with CMC/SBR as a dual binder can achieve more than 1200 cycles with a capacity of 1000 mAh g^−1 of Si. This excellent electrochemical performance can be attributed to the use of a buffer as a solvent to control the pH of the electrode slurry, and hence the bonding properties of the binder to the silicon particles. In addition, the use of FEC as an electrolyte additive is greatly contributing to a stabilized cycling by creating a more robust SEI layer. This work clearly demonstrates the potential of industrial battery grade silicon from Elkem.

Yuexi Liu - One of the best experts on this subject based on the ideXlab platform.

  • high capacity silicon Carbon Composite anode materials for lithium ion batteries
    Electrochemistry Communications, 2003
    Co-Authors: Zhongsheng Wen, J B Yang, Baofeng Wang, Kunqi Wang, Yuexi Liu
    Abstract:

    Abstract Silicon/Carbon Composite materials are prepared by pyrolysis of pitch embedded with graphite and silicon powders. As anode for lithium ion batteries, its initial reversible capacity is 800–900 mAh/g at 0.25 mA/cm 2 in a voltage range of 0.02/1.5 V vs. Li. The material modification by adding a small amount of CaCO 3 into precursor improves the initial reversibility ( η 1 =84%) and suppresses the capacity fade upon cycling. A little higher insertion voltage of the Composites than commercial CMS anode material improves the cell safety in the high rate charging process.

Sreekanth Pannala - One of the best experts on this subject based on the ideXlab platform.

Hanne Flåten Andersen - One of the best experts on this subject based on the ideXlab platform.

  • Silicon-Carbon Composite anodes from industrial battery grade silicon
    Scientific Reports, 2019
    Co-Authors: Hanne Flåten Andersen, Carl Erik Lie Foss, Jorunn Voje, Ragnar Tronstad, Asbjørn Ulvestad, Martin Kirkengen, Tommy Mokkelbost, Per Erik Vullum, Jan Petter Mæhlen
    Abstract:

    In this work, silicon/Carbon Composites for anode electrodes of Li-ion batteries are prepared from Elkem’s Silgrain® line. Gentle ball milling is used to reduce particle size of Silgrain, and the resulting Si powder consists of micrometic Si with some impurities. Silicon/Carbon Composite with CMC/SBR as a dual binder can achieve more than 1200 cycles with a capacity of 1000 mAh g^−1 of Si. This excellent electrochemical performance can be attributed to the use of a buffer as a solvent to control the pH of the electrode slurry, and hence the bonding properties of the binder to the silicon particles. In addition, the use of FEC as an electrolyte additive is greatly contributing to a stabilized cycling by creating a more robust SEI layer. This work clearly demonstrates the potential of industrial battery grade silicon from Elkem.

Seung M Oh - One of the best experts on this subject based on the ideXlab platform.

  • an amorphous red phosphorus Carbon Composite as a promising anode material for sodium ion batteries
    Advanced Materials, 2013
    Co-Authors: Yuwon Park, Aram Choi, Namsoon Choi, Seung M Oh
    Abstract:

    : An amorphous red phosphorus/Carbon Composite is obtained through a facile and simple ball milling process, and its electrochemical performance as an anode material for Na ion batteries is evaluated. The Composite shows excellent electrochemical performance including a high specific capacity of 1890 mA h g(-1), negligible capacity fading over 30 cycles, an ideal redox potential (0.4 V vs. Na/Na(+)), and an excellent rate performance, thus making it a promising candidate for Na ion batteries.

  • electrochemical capacitor performance of hydrous ruthenium oxide mesoporous Carbon Composite electrodes
    Journal of Power Sources, 2003
    Co-Authors: Jong Hyun Jang, Taeghwan Hyeon, Seung M Oh
    Abstract:

    Abstract Ruthenium/Carbon Composite materials are prepared by impregnating ruthenium(III) acetylacetonate into a mesoporous Carbon (average pore diameter=12 mn, pore volume=3.6 cm 3  g −1 ) and then heat treatment at 320 °C for 2 h under an argon atmosphere. The metallic ruthenium nanoparticles are converted to pseudo-capacitive hydrous ruthenium oxide by electrochemical oxidation at 0.75 V (versus SCE) for 2 h in 2.0 M H 2 SO 4 . The specific capacitance of the Composite electrodes, which is the sum of the double-layer capacitance of mesoporous Carbon and the pseudo-capacitance of hydrous ruthenium oxide, reaches 243 F g −1 with heavy loading. As the loading is increased, however, the degree of ruthenium utilization for a pseudo-capacitor becomes poorer, presumably due to a limited conversion to the hydrous oxide form. The rate capability of Composite electrodes also decreases with increase in ruthenium loading, due to an increase in both the equivalent series resistance (ESR) and the overall capacitance value. The ESR enlargement is caused mainly an increase in the electrolyte resistance within pores which, in turn, results from a pore narrowing with ruthenium loading Hindered ionic motion in narrowed pores can explain this feature. An increase in the RC time constant with ruthenium loading is further verified by ac impedance measurements.