Electrochemical Impedance Characterization of LiMnPO4 Electrodes with Different Additions of MWCNTs in an Aqueous Electrolyte

Barraza-Fierro, Jesus Israel; Chu, Tse-Ming; Castaneda‐Lopez, Homero

doi:10.29356/jmcs.v63i3.627

Cited by 5 publications

(3 citation statements)

References 46 publications

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“…Here, "ss" means a surface site. The expression of the faradaic current is shown in Equation (13), while the relationship between the coverage factor and potential can be found from the dependency of the coverage with time in non-steady conditions (Equations ( 14)-( 17)) [43].…”

Section: Impedance Spectroscopy Modelingmentioning

confidence: 99%

Corrosion Behavior of Al Modified with Zn in Chloride Solution

Porcayo-Calderón

Barragán²,

Barraza-Fierro

et al. 2022

Materials

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Aluminum-based alloys have been considered candidate materials for cathodic protection anodes. However, the Al-based alloys can form a layer of alumina, which is a drawback in a sacrificial anode. The anodes must exhibit uniform corrosion to achieve better performance. Aluminum can be alloyed with Zn to improve their performance. In this sense, in the present research, the electrochemical corrosion performance of Al-xZn alloys (x = 1.5, 3.5, and 5 at.% Zn) exposed to 3.5 wt.% NaCl for 24 h was evaluated. Polarization curves, linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS) were used to identify the electrochemical behavior. The microstructure of the samples before the corrosion assessment was characterized by means of X-ray diffraction analyses (XRD) and scanning electron microscopy (SEM). In addition, microstructures of the corroded surfaces were characterized using X-ray mappings via SEM. Polarization curves indicated that Zn additions changed the pseudo-passivation behavior from what pure Al exhibited in a uniform dissolution regime. Furthermore, the addition of Zn shifted the corrosion potential to the active side and increased the corrosion rate. This behavior was consistent with the proportional decrease in polarization resistance (Rp) and charge transfer resistance (Rct) in the EIS. The analysis of EIS was done using a mathematical model related to an adsorption electrochemical mechanism. The adsorption of chloride at the Al-Zn alloy surface formed aluminum chloride intermediates, which controlled the rate of the process. The rate constants of the reactions of a proposed chemical mechanism were evaluated.

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Section: Impedance Spectroscopy Modelingmentioning

confidence: 99%

Corrosion Behavior of Al Modified with Zn in Chloride Solution

Porcayo-Calderón

Barragán²,

Barraza-Fierro

et al. 2022

Materials

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“…Other Mn‐based electrodes made short appearances, including MnO 2 40,41 and LiMnPO 4 42,43 . LiMnPO 4 reappeared briefly in 2019 with the addition of multiwall carbon nanotubes to the LiMnPO 4 cathode that increased the electrical conductivity of the cathode; however, cell impedance was unacceptably high and battery cycling was not attempted 44 . Notably, LiCoO 2 was also shown to perform as a cathode by Ruffo et al in 2009, 20 Yadegari et al in 2011, 45 and Ramanujapuram et al in 2016, 46 delivering nearly 100 mAh/g at industry‐relevant electrode loading levels of 3 mg/cm 2 or more of active material.…”

Section: Aqueous Lithium‐ion Batteries: the Early Daysmentioning

confidence: 99%

Aqueous lithium‐ion batteries

Cresce

2021

Carbon Energy

133

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Aqueous electrolytes were once the rule for the battery industry. Until the advent of lithium ion batteries, a majority of commercially relevant batteries utilized water as the solvent for ion exchange. The development of the intercalation‐based lithium ion battery upended the industrial aqueous electrolyte paradigm: the high energy density of the lithium‐ion battery was revolutionary but required the use of organic electrolytes capable of passivating strongly redox active electrodes. With the safety of organic electrolytes becoming an issue in the early 1990s, a small community re‐examined aqueous electrolytes for lithium ion batteries. The first such audacious attempt was by Dahn et al., who conceptualized an aqueous lithium‐ion battery chemistry based on electrode materials suitable for the narrow electrochemical stability window of water, sacrificing energy density and cycle life for safety and low cost. The concept of an aqueous lithium‐ion battery was revived in the mid‐2010s with “highly concentrated” electrolytes, expanding the electrochemical stability window of water to regions comparable with nonaqueous electrolytes. Since then, significant efforts have been made around the world, aiming to understand the nature of the interfacial stability in those high‐concentration electrolytes as well as to further make the system viable for practical batteries. This review summarizes these efforts in this emerging frontier of new battery chemistries.

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“…These results showed that the addition of CNTs to the active material can provide higher conductivity, a better rate performance, and also improve capacity retention during cycling by avoiding contact loss between active particles. J. Barraza-Fierro with co-authors [33] described the electrochemical behaviour of multi-walled carbon nanotubes (MWCNTs) in an acidic aqueous electrolyte (1 M LiNO 3 /HNO 3 with pH = 2) in the potential range of 0.4-1.4 V vs. Ag/AgCl. However, in this potential range (0.4-1.4 V vs. Ag/AgCl), lithium intercalation in MWCNTs did not occur, so it does not allow for the evaluation of the applicability of MWCNTs as an anode.…”

Section: Introductionmentioning

confidence: 99%

Modification of Single-Walled Carbon Nanotube Networks Anodes for Application in Aqueous Lithium-Ion Batteries

et al. 2023

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The changes in global energy trends and the high demand for secondary power sources, have led to a renewed interest in aqueous lithium-ion batteries. The selection of a suitable anode for aqueous media is a difficult task because many anode materials have poor cycling performance due to side reactions with water or dissolved oxygen. An effective method for improving the characteristics of anodes in aqueous electrolyte solutions is adding carbon nanotubes (CNTs) to the electrode materials. For a better comprehension of the mechanism of energy accumulation and the reasons for the loss of capacity during the cycling of chemical current sources, it is necessary to understand the behaviour of the constituent components of the anodes. Although CNTs are well studied theoretically and experimentally, there is no information about their behaviour in aqueous solutions during the intercalation/deintercalation of lithium ions. This work reveals the mechanism of operation of untreated and annealed single-walled carbon nanotubes (SWCNT) anodes during the intercalation/deintercalation of Li+ from an aqueous 5 M LiNO3 electrolyte. The presence of -COOH groups on the surface of untreated SWCNTs is the reason for the low discharge capacity of the SWCNT anode in 5 M LiNO3 (3 mAh g−1 after 100 cycles). Their performance was improved by annealing in a hydrogen atmosphere, which selectively removed the -COOH groups and increased the discharge capacity of SWCNT by a factor of 10 (33 mAh g−1 after 100 cycles).

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Electrochemical Impedance Characterization of LiMnPO4 Electrodes with Different Additions of MWCNTs in an Aqueous Electrolyte

Cited by 5 publications

References 46 publications

Corrosion Behavior of Al Modified with Zn in Chloride Solution

Corrosion Behavior of Al Modified with Zn in Chloride Solution

Aqueous lithium‐ion batteries

Modification of Single-Walled Carbon Nanotube Networks Anodes for Application in Aqueous Lithium-Ion Batteries

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