Electrochemical impedance study of Li-ion insertion into mesocarbon microbead single particle electrode

Umeda, Minoru; Dokko, Kaoru; Fujita, Yoshihiro; Mohamedi, Mohamed; Uchida, Isamu; Selman, J. R.

doi:10.1016/s0013-4686(01)00799-x

Cited by 200 publications

(128 citation statements)

References 34 publications

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“…3, the characteristic peaks during the charging can be attributed to the changes in the graphite structure. Comparing the results with the ex-situ voltammogram, 2,16,17 in the range of 0.3 0.22 V vs. Li/Li + , the Li ion density in graphite is very low, and the Li ions are randomly inserted between all layers, and the graphite structure goes from the dilute stage-1 to stage-4. 2,1621 In the range of 0.180.22 V, a clear phase transition from stage-4 to stage-3 is not occurring.…”

Section: Resultsmentioning

confidence: 81%

“…Comparing the results with the ex-situ voltammogram, 2,16,17 in the range of 0.3 0.22 V vs. Li/Li + , the Li ion density in graphite is very low, and the Li ions are randomly inserted between all layers, and the graphite structure goes from the dilute stage-1 to stage-4. 2,1621 In the range of 0.180.22 V, a clear phase transition from stage-4 to stage-3 is not occurring. The phase transition from stage-3 to stage-2 occurs at peak d, and the phase transition from stage-2 to stage-1 occurs at peak e. As described above, by using a lithium ion secondary cell with a reference electrode, we were able to obtain in-situ results that were similar to the half-cell ex-situ results.…”

Section: Resultsmentioning

confidence: 81%

“…The phase transition from stage-3 to stage-2 occurs at peak d, and the phase transition from stage-2 to stage-1 occurs at peak e. As described above, by using a lithium ion secondary cell with a reference electrode, we were able to obtain in-situ results that were similar to the half-cell ex-situ results. 2 The noise observed around 0.04 V vs. Li/Li + , corresponds to a potential change during the charging shown in Fig. 2.…”

Section: Resultsmentioning

confidence: 92%

“…2,1618 According to the dQ/dE vs. E curves of the degraded cells, the changes in the anode reaction were then analyzed.…”

Section: Introductionmentioning

confidence: 99%

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Chronopotentiometric Investigation of Anode Deterioration in Lithium Ion Secondary Cell Incorporating Reference Electrode

et al. 2012

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We were able to derive the dQ/dE vs. E curve by carrying out chronopotentiometric measurements using a lithium ion secondary cell incorporating a reference electrode. These in-situ measurements were found to be comparable to the ex-situ measurements, which were obtained using a graphite single particle method. The dQ/dE vs. E curves for the anode of the same type of cells, which contain storage deterioration and cyclic test deterioration data, were then obtained. As a result, an over potential increase in the charge and discharge peaks, as well as a decrease in the charge coulombs was observed. As a result of the dQ/dE vs. E curves of the anode of degraded lithium ion secondary cells incorporating a reference electrode, we were able to evaluate the graphite degradation under conditions close to real environmental conditions.

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Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 92%

“…2,1618 According to the dQ/dE vs. E curves of the degraded cells, the changes in the anode reaction were then analyzed.…”

Section: Introductionmentioning

confidence: 99%

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Chronopotentiometric Investigation of Anode Deterioration in Lithium Ion Secondary Cell Incorporating Reference Electrode

et al. 2012

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“…The slope line at low frequency corresponds to the Warburg impedance (Z w ), which is related to the Li-ion diffusion in the electrodes [45]. The authors also show that the R ct of Li 4 Ti 5 O 12 with 3 wt% carbon addition is the least and that with 5 wt% carbon addition the largest.…”

Section: Impedance Spectroscopymentioning

confidence: 90%

Li4Ti5O12/TiO2-SiO2 and Li4Ti5O12/SiO2 composites as an anode material for Li-ion batteries

Kurc

2017

Ionics

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The commercial electrode Li 4 Ti 5 O 12 was modified with SiO 2 and TiO 2 -SiO 2 . All samples were characterized by scanning electron microscope (SEM), particle size distribution (PSD), porous structure parameters (low-temperature N 2 sorption), galvanostatic charge-discharge test, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). Appropriate amount of TiO 2 -SiO 2 and SiO 2 could effectively reduce the electrochemical polarization of Li 4 Ti 5 O 12 and enhance electrochemical reaction kinetics of Li + insertion/ deinsertion. Moreover, Li 4 Ti 5 O 12 /TiO 2 -SiO 2 provides a high rate capacity of 165 mAh g −1 at the high current density of 0.5 C. To investigate cycle stability of the electrode materials at high current density, the measurements were directly carried out at 3 C. SEM images of the LTO/TiO 2 -SiO 2 , LTO, and LTO/SiO 2 particles after galvanostatic charging/discharging show that they were coated by a uniform layer (the SEI layer).

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Ti³⁺ Self‐Doped Dark Rutile TiO₂ Ultrafine Nanorods with Durable High‐Rate Capability for Lithium‐Ion Batteries

Chen

Song

Hou

et al. 2015

Adv Funct Materials

230

119

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Dark‐colored rutile TiO2 nanorods doped by electroconducting Ti3+ have been obtained uniformly with an average diameter of ≈7 nm, and have been first utilized as anodes in lithium‐ion batteries. They deliver a high reversible specific capacity of 185.7 mAh g−1 at 0.2 C (33.6 mA g−1) and maintain 92.1 mAh g−1 after 1000 cycles at an extremely high rate 50 C with an outstanding retention of 98.4%. Notably, the coulombic efficiency of Ti3+–TiO2 has been improved by approximately 10% compared with that of pristine rutile TiO2, which can be mainly attributed to its prompt electron transfer because of the introduction of Ti3+. Again the synergetic merits are noticed when the promoted electronic conductivity is combined with a shortened Li+ diffusion length resulting from the ultrafine nanorod structure, giving rise to the remarkable rate capabilities and extraordinary cycling stabilities for applications in fast and durable charge/discharge batteries. It is of great significance to incorporate Ti3+ into rutile TiO2 to exhibit particular electrochemical characteristics triggering an effective way to improve the energy storage properties.

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Electrochemical impedance study of Li-ion insertion into mesocarbon microbead single particle electrode

Cited by 200 publications

References 34 publications

Chronopotentiometric Investigation of Anode Deterioration in Lithium Ion Secondary Cell Incorporating Reference Electrode

Chronopotentiometric Investigation of Anode Deterioration in Lithium Ion Secondary Cell Incorporating Reference Electrode

Li4Ti5O12/TiO2-SiO2 and Li4Ti5O12/SiO2 composites as an anode material for Li-ion batteries

Ti³⁺ Self‐Doped Dark Rutile TiO₂ Ultrafine Nanorods with Durable High‐Rate Capability for Lithium‐Ion Batteries

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Electrochemical impedance study of Li-ion insertion into mesocarbon microbead single particle electrode

Cited by 200 publications

References 34 publications

Chronopotentiometric Investigation of Anode Deterioration in Lithium Ion Secondary Cell Incorporating Reference Electrode

Chronopotentiometric Investigation of Anode Deterioration in Lithium Ion Secondary Cell Incorporating Reference Electrode

Li4Ti5O12/TiO2-SiO2 and Li4Ti5O12/SiO2 composites as an anode material for Li-ion batteries

Ti3+ Self‐Doped Dark Rutile TiO2 Ultrafine Nanorods with Durable High‐Rate Capability for Lithium‐Ion Batteries

Contact Info

Product

Resources

About

Ti³⁺ Self‐Doped Dark Rutile TiO₂ Ultrafine Nanorods with Durable High‐Rate Capability for Lithium‐Ion Batteries