Performance enhancement of spherical natural graphite by phenol resin in lithium ion batteries

Wu, Yi-Chan; Wang, Yi-Hsiung; Lee, Yuan-Haun

doi:10.1016/j.jallcom.2005.11.093

Cited by 29 publications

(11 citation statements)

References 22 publications

(20 reference statements)

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“…The application requires high power, high energy density and a high efficiency power supply [1][2][3]. Studies on anode materials, aimed at improving material capacity and cyclability, have been active for many years [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Performance of modified graphite as anode material for lithium-ion secondary battery

Zheng¹,

Kim²

2011

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Two different types of graphite, such as flake graphite (FG) and spherical graphite (SG), were used as anode materials for a lithium-ion secondary battery in order to investigate their electrochemical performance. The FG particles were prepared by pulverizing natural graphite with a planetary mill. The SG particles were treated by immersing them in acid solutions or mixing them with various carbon additives. With a longer milling time, the particle size of the FG decreased. Since smaller particles allow more exposure of the edge planes toward the electrolyte, it could be possible for the FG anodes with longer milling time to deliver high reversible capacity; however, their initial efficiency was found to have decreased. The initial efficiency of SG anodes with acid treatments was about 90%, showing an over 20% higher value than that of FG anodes. With acid treatment, the discharge rate capability and the initial efficiency improved slightly. The electrochemical properties of the SG anodes improved slightly with carbon additives such as acetylene black (AB), Super P, Ketjen black, and carbon nanotubes. Furthermore, the cyclability was much improved due to the effect of the conductive bridge made by carbon additives such as AB and Super P.

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Section: Introductionmentioning

confidence: 99%

Performance of modified graphite as anode material for lithium-ion secondary battery

Zheng¹,

Kim²

2011

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“…Our previous study (Wu et al, 2006) showed that carboncoated graphite effectively suppressed the irreversible capacity because the fully coated graphite decreased the extent of exfoliation. Investigations revealed that during cycling tests, electrolytes penetrated spherical graphite, causing surface cracks (Zhang et al, 2005).…”

Section: Resultsmentioning

confidence: 97%

The improvement on capacity retention of silicon/graphite composites with TiN additive as anode materials for Li-ion battery

Lee

Tsai

2008

Journal of Materials Processing Technology

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“…More importantly, the spherical morphology of SG results in its relatively small aspect ratio, which can potentially reduce the heterogeneous interfaces between the graphite particles and the AlN matrix and their adverse effect of interfacial thermal resistance on the thermal conductivity of the composites. Owing to its high electrical conductivity, low specific surface area, chemical resistance, high crystallinity and high theoretical lithium insertion capacity, SG is widely utilized to as a substitute for the traditional flake graphite for the preparation of the battery negative electrodes [39,40]. Regrettably, as far as we know, there are few reports on the preparation of ceramic matrix composites filled with spherical graphite.…”

Section: Introductionmentioning

confidence: 99%

High-thermally conductive AlN-based microwave attenuating composite ceramics with spherical graphite as attenuating agent

Xia

Jiang

Pan

et al. 2020

Preprint

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High-thermally conductive AlN-based microwave attenuating composite ceramics with spherical graphite (SG) as the attenuating agent were fabricated through hot-pressing sintering. The SG maintains its three-dimensional morphology within the sintered bodies, which considerably impedes the sintering of the composites to some extent but slightly influences on the growth of AlN grains. The addition of SG reduces the strength of the composites, but provides a moderate toughening effect at the optimal addition amount (3.8 MPa·m1/2 at 4 wt% SG). Benefiting from the low anisotropy, high thermal conductivity, and the three-dimensional morphology of SG, the composites exhibit a relatively higher thermal conductivity (76.82 W·m-1·k-1 at 10 wt% SG) compared with composites added with non-spherical attenuating agent. The dielectric constant and loss (8.2–12.4 GHz) increase remarkably as the amount of SG added increases up to 8 wt%, revealing that the incorporation of SG improves the dielectric property of the composite. The composite with 7 wt% SG exhibits the best absorption performance with a minimum reflection loss of -14 dB at 12.4 GHz and an effective absorbing bandwidth of 0.87 GHz. The excellent overall properties of the SG/AlN microwave attenuating composites render them as a promising material for various applications. Moreover, SG has a great potential as an attenuating agent for microwave attenuating composites due to its strong attenuation upon integration, high thermal conductivity, and low anisotropy.

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Performance enhancement of spherical natural graphite by phenol resin in lithium ion batteries

Cited by 29 publications

References 22 publications

Performance of modified graphite as anode material for lithium-ion secondary battery

Performance of modified graphite as anode material for lithium-ion secondary battery

The improvement on capacity retention of silicon/graphite composites with TiN additive as anode materials for Li-ion battery

High-thermally conductive AlN-based microwave attenuating composite ceramics with spherical graphite as attenuating agent

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