Study of the lithium diffusion properties and high rate performance of TiNb6O17 as an anode in lithium secondary battery

Lee, Yong Seok; Ryu, Kwang‐Sun

doi:10.1038/s41598-017-16711-9

Cited by 175 publications

(88 citation statements)

References 37 publications

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“…In both electrodes, the diffusion of

L i^{+}

is around 1.5 times faster during the delithiation compared to the lithiation process. This observation correlates with

L i^{+}

diffusion coefficients determined by cyclic voltammetry characterisation of electrodes in lithium-ion batteries [42,43,44]. Ratios in diffusion coefficients between uncycled and cycled electrodes indicate the

L i^{+}

diffusion coefficient to decrease with ageing.…”

Section: Resultssupporting

confidence: 66%

On the Ageing of High Energy Lithium-Ion Batteries—Comprehensive Electrochemical Diffusivity Studies of Harvested Nickel Manganese Cobalt Electrodes

et al. 2018

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This paper examines the impact of the characterisation technique considered for the determination of the Li+ solid state diffusion coefficient in uncycled as in cycled Nickel Manganese Cobalt oxide (NMC) electrodes. As major characterisation techniques, Cyclic Voltammetry (CV), Galvanostatic Intermittent Titration Technique (GITT) and Electrochemical Impedance Spectroscopy (EIS) were systematically investigated. Li+ diffusion coefficients during the lithiation process of the uncycled and cycled electrodes determined by CV at 3.71 V are shown to be equal to 3.48×10−10 cm2·s−1 and 1.56×10−10 cm2·s−1 , respectively. The dependency of the Li+ diffusion with the lithium content in the electrodes is further studied in this paper with GITT and EIS. Diffusion coefficients calculated by GITT and EIS characterisations are shown to be in the range between 1.76×10−15 cm2·s−1 and 4.06×10−12 cm2·s−1, while demonstrating the same decreasing trend with the lithiation process of the electrodes. For both electrode types, diffusion coefficients calculated by CV show greater values compared to those determined by GITT and EIS. With ageing, CV and EIS techniques lead to diffusion coefficients in the electrodes at 3.71 V that are decreasing, in contrast to GITT for which results indicate increasing diffusion coefficient. After long-term cycling, ratios of the diffusion coefficients determined by GITT compared to CV become more significant with an increase about 1 order of magnitude, while no significant variation is seen between the diffusion coefficients calculated from EIS in comparison to CV.

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“…In both electrodes, the diffusion of

L i^{+}

is around 1.5 times faster during the delithiation compared to the lithiation process. This observation correlates with

L i^{+}

L i^{+}

diffusion coefficient to decrease with ageing.…”

Section: Resultssupporting

confidence: 66%

On the Ageing of High Energy Lithium-Ion Batteries—Comprehensive Electrochemical Diffusivity Studies of Harvested Nickel Manganese Cobalt Electrodes

et al. 2018

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“…The fast-charging capability of Li-ion batteries is affected by electrochemical parameters including the ion diffusivity in electrolyte and electrodes as well as the electrical conductivity of electrodes, which are directly related to the ion and charge transfers in batteries. Approaches have been developed to improve the ion and charge transfers, for example, through the preparations of weakly bound solvation structure [45], novel anodes [46], and modified electrodes [47]. In Sec.…”

Section: Effect Of Electrode Parametersmentioning

confidence: 99%

Cathode Chemistries and Electrode Parameters Affecting the Fast Charging Performance of Li-Ion Batteries

Zhao

Liu

2020

Journal of Electrochemical Energy Conversion and Storage

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Li-ion battery fast-charging technology plays an important role in popularizing electric vehicles (EV), which critically need a charging process that is as simple and quick as pumping fuel for conventional internal combustion engine vehicles. To ensure stable and safe fast charging of Li-ion battery, understanding the electrochemical and thermal behaviors of battery electrodes under high rate charges is crucial, since it provides insight into the limiting factors that restrict the battery from acquiring energy at high rates. In this work, charging simulations are performed on Li-ion batteries that use the LiCoO2 (LCO), LiMn2O4 (LMO), and LiFePO4 (LFP) as the cathodes. An electrochemical-thermal coupling model is first developed and experimentally validated on a 2.6Ah LCO based Li-ion battery and is then adjusted to study the LMO and LFP based batteries. LCO, LMO, and LFP based Li-ion batteries exhibited different thermal responses during charges due to their different entropy profiles, and results show that the entropy change of the LCO battery plays a positive role in alleviating its temperature rise during charges. Among the batteries, the LFP battery is difficult to be charged at high rates due to the charge transfer limitation caused by the low electrical conductivity of the LFP cathode, which, however, can be improved through doping or adding conductive additives. A parametric study is also performed by considering different electrode thicknesses and secondary particle sizes. It reveals that the concentration polarization at the electrode and particle levels can be weaken by using thin electrodes and small solid particles, respectively. These changes are helpful to mitigate the diffusion limitation and improve the performance of Li-ion batteries during high rate charges, but careful consideration should be taken when applying these changes since they can reduce the energy density of the batteries.

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“…The domino-cascade model by Delmas et al takes into account the coexistence of a lithiated and delithiated phase for LFP [78]. Additionally, other mechanisms and factors, e.g., the generation of surface layers, porosity and tortuosity of electrodes, electrolyte salts and concentration gradients in the electrodes are affecting the ion transport and therefore influence the diffusion coefficients measured on the cell level [79][80][81][82]. The formation of an inactive phase by ageing which does not significantly contribute to the ESM signal is consistent with our observation that diffusion coefficients do not change.…”

Section: Comparison Of the Esm Signal On Fresh And Aged Cathodesmentioning

confidence: 99%

Comparison of fresh and aged lithium iron phosphate cathodes using a tailored electrochemical strain microscopy technique

Simolka¹,

Kaess²,

Friedrich³

2020

Beilstein J. Nanotechnol.

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Electrochemical strain microscopy (ESM) is a powerful atomic force microscopy (AFM) mode for the investigation of ion dynamics and activities in energy storage materials. Here we compare the changes in commercial LiFePO4 cathodes due to ageing and its influence on the measured ESM signal. Additionally, the ESM signal dynamics are analysed to generate characteristic time constants of the diffusion process, induced by a dc-voltage pulse, which changes the ionic concentration in the material volume under the AFM tip. The ageing of the cathode is found to be governed by a decrease of the electrochemical activity and the loss of available lithium for cycling, which can be stored in the cathode.

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Study of the lithium diffusion properties and high rate performance of TiNb6O17 as an anode in lithium secondary battery

Cited by 175 publications

References 37 publications

On the Ageing of High Energy Lithium-Ion Batteries—Comprehensive Electrochemical Diffusivity Studies of Harvested Nickel Manganese Cobalt Electrodes

On the Ageing of High Energy Lithium-Ion Batteries—Comprehensive Electrochemical Diffusivity Studies of Harvested Nickel Manganese Cobalt Electrodes

Cathode Chemistries and Electrode Parameters Affecting the Fast Charging Performance of Li-Ion Batteries

Comparison of fresh and aged lithium iron phosphate cathodes using a tailored electrochemical strain microscopy technique

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