Influence of solvent species on the charge–discharge characteristics of a natural graphite electrode

Fujimoto, Masahisa; Shoji, Yoshihiro; Kida, Yoshinori; Ohshita, Ryuji; Nohma, Toshiyuki; Nishio, Koji

doi:10.1016/s0378-7753(97)02691-8

Cited by 34 publications

(17 citation statements)

References 7 publications

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“…Many NG's have been studied electrochemically to characterize their reversible capacity and first cycle irreversible capacity loss (ICL), or first cycle coulombic inefficiency. The dependence of performance on the particle size [1], surface area [2], surface modification [3,4], and mechanical milling [5,6], in various organic electrolytes has been studied, as well as the dependence on the composition of the electrolyte [7,8]. The ICL is due to primarily to the formation of a passivating solid electrolyte interface (SEI) layer by the decomposition of the electrolyte to form both as SEI layer and gaseous products on the surface of graphite during the initial charge/discharge cycles [9].…”

Section: Introductionmentioning

confidence: 99%

The dependence of natural graphite anode performance on electrode density

Shim

Striebel

2004

Journal of Power Sources

106

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The effect of electrode density for lithium intercalation and irreversible capacity loss on the natural graphite anode in lithium ion batteries was studied by electrochemical methods.Both the first-cycle reversible and irreversible capacities of the natural graphite anode decreased with an increase in the anode density though compression. The reduction in reversible capacity was attributed to a reduction in the chemical diffusion coefficient for lithium though partially agglomerated particles with a larger stress. For the natural graphite in this study the potentials for Li (de)insertion shifted between the first and second formation cycles and the extent of this shift was dependent on electrode density. The relation between this peak shift and the irreversible capacity loss are probably both due to the decrease in graphite surface area with compression.

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Section: Introductionmentioning

confidence: 99%

The dependence of natural graphite anode performance on electrode density

Shim

Striebel

2004

Journal of Power Sources

106

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“…Many factors have been shown to influence the behavior of the SEI on a natural graphite anode. The nature of the carbon and the composition of the electrolyte are the most important and the most studied [1,2]. The electrolyte composition will affect the amount of solvent cointercalation [3] that will precede or accompany the formation of the passivating layer on the graphite and the first intercalation of the Li ions into the graphite.…”

Section: Introductionmentioning

confidence: 99%

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

Striebel

Sierra

Shim

et al. 2004

Journal of Power Sources

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Anodes for lithium-ion cells were constructed from three types of natural graphite, two coated spherical and one flaky. Anode samples were compressed from 0 to 300 kg/cm 2 and studied in half-cells to study the relations between anode density, SEI formation and anode cyclability. The C/25 formation of the SEI layer was found to depend on the nature of the graphite and the anode density. Compression of the uncoated graphite lead to an increased conductivity, but only slight improvements in the efficiency of the formation process. Compression of the anodes made from the amorphous-carbon-coated graphites greatly improved both the reversible capacity and first-cycle efficiency. In addition, the fraction of the irreversible charge associated with the surface of the graphite increased with compression, from both an increase in the electrolyte contact as well as compression of the amorphous layer. The cyclability of all of the anodes tended to improve with compression. This suggests that it is the improvement in the conductivity of the anode plays more of a role in the improvement in the cyclability than the formation process.

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“…[1][2] However, it has one big disadvantage that may obstruct its further use. That is, its sensitivity to propylene carbonate (PC)-based electrolytes.…”

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confidence: 99%