An electrochemical impedance spectroscopic study of the transport properties of LiNi0.75Co0.25O2

Croce, F.; Nobili, Francesco; Deptula, A.; Łada, W.; Tossici, Roberto; D’Epifanio, Alessandra; Scrosati, B.; Marassi, Roberto

doi:10.1016/s1388-2481(99)00123-x

Cited by 113 publications

(32 citation statements)

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“…The slope line at low frequencies corresponds to the Warburg impedance (Z w ), which is related to Li-ion diffusion within the particles. [19][20][21][22] The resistance parameters given in Table 1show that both R sei and R ct were significantly higher for TiO 2 than TiO 2 -Li, which led to The specific capacities measured at rates ranging from 0.1 C to 10 C are shown in Figure 6 a. Both electrodes displayed different cyclic performances depending on rate, which may be attributed to their different surface chemistries and surface areas.…”

Section: Resultsmentioning

confidence: 98%

Li‐ion Reaction to Improve the Rate Performance of Nanoporous Anatase TiO₂ Anodes

Liu

et al. 2013

Energy Tech

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Large initial capacity losses and low tap densities are among the major challenges to the wide‐ranging application of Li ion batteries based on anatase titania (TiO2) anodes. This study reports the root causes of the capacity losses and proposes effective ways to control them. Nanoporous TiO2 microspheres with a tap density as high as 1.1 g cm−3 are successfully prepared by using a spray drying method and a focused study is made of their electrochemical reaction kinetics. According to the results, the capacity losses are ascribed to the irreversible Li‐ion interfacial storage capability that arises mainly from the high reactivity between TiO2 and the electrolyte solution. A new anode material, TiO2–Li, prepared by reacting TiO2 with Li ions delivers a 50 % reduction in charge‐transfer resistance and a remarkable enhancement of Li‐ion diffusion coefficient by almost seven times, as compared to the neat TiO2 powders. The TiO2–Li anode presents a much lower initial capacity loss, higher rate performance, and better reversibility.

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Section: Resultsmentioning

confidence: 98%

Li‐ion Reaction to Improve the Rate Performance of Nanoporous Anatase TiO₂ Anodes

Liu

et al. 2013

Energy Tech

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“…Expressing Equation (12) in complex form, the battery impedance can be expressed as: (13) where Z' represents the real part of the complex; Z" represents the imaginary part of the complex; |Z| represents the magnitude of AC impedance; and θ represents the angle of AC impedance [22][23][24].…”

Section: Experimental Analysismentioning

confidence: 99%

Fast Estimation of State of Charge for Lithium-Ion Batteries

Chen

Chou

2014

Energies

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This paper presents a novel impedance-based approach to efficiently estimate the state of charge (SOC) of a Li-ion battery. By using an AC impedance analyzer, a database is constructed, containing records of AC impedance versus SOC. In practical applications, the SOC values can be found instantly once the contents of the database are referenced. For validation purposes, AC impedance comparisons are conducted using AC impedance analyzer as a benchmark at SOC of 0%, 50% and 100%, which indicate errors of 8.636%, 2.604% and 0.600%, respectively.

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“…Moreover, the Nyquist plots of electrodes of the LiCoO 2 and its derivative materials Li x Ni 1−y Co y O 2 , which they obtained at low potentials (below 3.7 V), were also analogous to previously reported results consisting of two parts: 1) an arc in the high-frequency range relating to migration of lithium ions through the SEI film, and 2) a sloping line in the low-frequency range that is generally attributed to the charge transfer process or the blocking characteristic of the electrode. Croce and coworkers [16][17][18][19][20][21] attributed nevertheless the sloping line in low-frequency range to the electronic properties of the material. It is well known that the practical LiCoO 2 cathodes are composite materials, in which the active mass particles are bound to an aluminum current collector with a polymeric binder such as polyvinylidene difuoride (PVdF).…”

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“…The HFA is generally attributed to the migration of lithium ions through a surface film (also called solid electrolyte interphase (SEI)) on LiCoO 2 , the MFA is ascribed to the charge transfer step, and the incline line in the low frequency range reflects the solid state diffusion process of lithium ions into LiCoO 2 that is often described as finite space or restricted diffusion [11][12][13][14][15] . However, Croce and coworkers [16][17][18][19][20][21] considered that the drastic change in resistance caused by the insulator to metal transition must be necessarily reflected by the impedance dispersion, namely, the Nyquist plots of LiCoO 2 in the delithiated state should involve a third arc relating to the electronic properties of the material. Therefore, the Nyquist plots of electrochemical lithium intercalation into LiCoO 2 -based electrode should include four parts, i.e.…”

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An electrochemical impedance spectroscopic study of the electronic and ionic transport properties of LiCoO2 cathode

Zhuang

Fan

et al. 2007

CHINESE SCI BULL

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The storage behavior and process of the first delithiation-lithiation of LiCoO2 cathode were investigated by electrochemical impedance spectroscopy (EIS). The electronic and ionic transport properties of LiCoO2 cathode along with variation of electrode potential were obtained in 1 mol.L-1 LiPF6-EC: DMC: DEC electrolyte solution. It was found that after 9 h storage of the LiCoO2 cathode in electrolyte solutions, a new arc appears in the medium frequency range in Nyquist plots of EIS, which increases with increasing the storage time. In the charge/discharge processes, the diameter of the new arc is reversibly changed with electrode potential. Such variation coincides well with the electrode potential dependence of electronic conductivity of the LiCoO2.. Thus this new EIS feature is attributed to the change of electronic conductivity of LixCoO2 during storage of the LiCoO2 cathode in electrolyte solutions, as well as in processes of intercalation-deintercalationtion of lithium ions. It has been revealed that the reversible increase and decrease of the resistance of SEI film in charge-discharge processes can be also ascribed to the variation of electronic conductance of active materials of the LiCoO2 cathode

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An electrochemical impedance spectroscopic study of the transport properties of LiNi0.75Co0.25O2

Cited by 113 publications

References 5 publications

Li‐ion Reaction to Improve the Rate Performance of Nanoporous Anatase TiO₂ Anodes

Li‐ion Reaction to Improve the Rate Performance of Nanoporous Anatase TiO₂ Anodes

Fast Estimation of State of Charge for Lithium-Ion Batteries

An electrochemical impedance spectroscopic study of the electronic and ionic transport properties of LiCoO2 cathode

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An electrochemical impedance spectroscopic study of the transport properties of LiNi0.75Co0.25O2

Cited by 113 publications

References 5 publications

Li‐ion Reaction to Improve the Rate Performance of Nanoporous Anatase TiO2 Anodes

Li‐ion Reaction to Improve the Rate Performance of Nanoporous Anatase TiO2 Anodes

Fast Estimation of State of Charge for Lithium-Ion Batteries

An electrochemical impedance spectroscopic study of the electronic and ionic transport properties of LiCoO2 cathode

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Li‐ion Reaction to Improve the Rate Performance of Nanoporous Anatase TiO₂ Anodes

Li‐ion Reaction to Improve the Rate Performance of Nanoporous Anatase TiO₂ Anodes