The effect of compression on natural graphite anode performance and matrix conductivity

Striebel, Kathryn A.; Sierra, Azucena; Shim, Joongpyo; Wang, Chengqi; Sastry, Ann Marie

doi:10.1016/j.jpowsour.2004.03.052

Cited by 78 publications

(48 citation statements)

References 24 publications

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“…The critical importance of the electronic conductivity for battery performance has been shown several times. [2][3][4][5][6][7][8][9][10] However, no pertinent investigation of the electronic conductivity within composite electrodes has been addressed up to now, because it is a very difficult task. The dc transverse electronic conductivity, s dc , has been the only measured quantity to date.…”

Section: Introductionmentioning

confidence: 99%

A Multiscale Description of the Electronic Transport within the Hierarchical Architecture of a Composite Electrode for Lithium Batteries

Badot

Ligneel

Dubrunfaut

et al. 2009

Adv Funct Materials

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International audienceThe broadband dielectric spectroscopy technique is applied, for the first time, to a composite material used as an electrode for lithium battery. The electrical properties (permittivity and conductivity) are measured from low (a few Hz) to microwave (a few GHz) frequencies. The results demonstrate that the broadband dielectric spectroscopy technique is very sensitive to the different scales of the electrode architecture involved in electronic transport, from interatomic distances to macroscopic sizes, as well as to the morphology at these scales, coarse or fine distribution of the constituents. This work opens up new prospects for a more fundamental understanding and more rational optimization of the electronic transport in composite electrodes for lithium batteries and other electrochemical energy storage technologies (including other batteries, supercapacitors, low- and medium-temperature fuel cells), electrochemical sensors and conductor-insulator composite materials

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Section: Introductionmentioning

confidence: 99%

A Multiscale Description of the Electronic Transport within the Hierarchical Architecture of a Composite Electrode for Lithium Batteries

Badot

Ligneel

Dubrunfaut

et al. 2009

Adv Funct Materials

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“…Several other reports observed the fracturing of active materials during calendering. 25 A recent study of the calendering effect on Si alloy/graphite electrode shows that graphite particles allow the Si-containing anodes slide against each other during densification. 26 The SiO anodes in our study have ∼10% carbon coating, which may provide a similar smoothing and lubricant effect in the course of calendering.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

High Capacity and High Density Functional Conductive Polymer and SiO Anode for High-Energy Lithium-Ion Batteries

Zhao

Yuca

Zheng

et al. 2014

ACS Appl. Mater. Interfaces

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High capacity and high density functional conductive polymer binder/ SiO electrodes are fabricated and calendered to various porosities. The effect of calendering is investigated in the reduction of thickness and porosity, as well as the increase of density. SiO particle size remains unchanged after calendering. When compressed to an appropriate density, an improved cycling performance and increased energy density are shown compared to the uncalendered electrode and overcalendered electrode. The calendered electrode has a high-density of ∼1.2 g/cm 3 . A high loading electrode with an areal capacity of ∼3.5 mAh/cm 2 at a C/10 rate is achieved using functional conductive polymer binder and simple and effective calendering method.

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“…intercalates into the Li 4 Ti 5 O 12 , while the carbon in the Li 4 Ti 5 O 12 will also react with Li ? ions [29,30]. The latter reaction would lead to an irreversible capacity included in the discharge capacity.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Facile synthesis and high rate capability of Li4Ti5O12/C composite materials with controllable carbon content

Wang

Yan

et al. 2010

J Appl Electrochem

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A modified ball-milling-assisted green solid reaction method is provided to prepare Li 4 Ti 5 O 12 /C composite materials with controllable carbon content. Thermal analysis was utilized to investigate the reaction process and the temperature for eliminating carbon. The added carbon and the time for eliminating the carbon can affect the particle size and greatly improve the cycling stability and rate performance. Besides, the particle size can reach *60 nm, the Li 4 Ti 5 O 12 eliminated carbon at 600°C has *178% higher discharge capacity than that without added carbon after 500 cycles under the same conditions. As for the Li 4 Ti 5 O 12 with a carbon weight of 10.6%, the second discharge capacity can reach 177.2 and 120.8 mAh g -1 at 1 and 20 C rates, respectively. Its discharge capacity still remains at 118.3 mAh g -1 after 500 cycles under various current rates. The results are comparable to those of the reported Li 4 Ti 5 O 12 /PAS composite.

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The effect of compression on natural graphite anode performance and matrix conductivity

Cited by 78 publications

References 24 publications

A Multiscale Description of the Electronic Transport within the Hierarchical Architecture of a Composite Electrode for Lithium Batteries

A Multiscale Description of the Electronic Transport within the Hierarchical Architecture of a Composite Electrode for Lithium Batteries

High Capacity and High Density Functional Conductive Polymer and SiO Anode for High-Energy Lithium-Ion Batteries

Facile synthesis and high rate capability of Li4Ti5O12/C composite materials with controllable carbon content

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