Comprehensive Interfacial Mechanisms of LiMnPO4-MWCNT Composite ratios in Acidic Aqueous Electrolyte

Chiu, Tse-Ming; Barraza-Fierro, Jesus Israel; Castaneda, Homero

doi:10.1016/j.electacta.2017.09.018

Cited by 10 publications

(8 citation statements)

References 46 publications

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“…Although the best performance is usually achieved in a neutral pH, some works have deliberately chosen acidic [40,41] or basic environments for better performance. Although the best performance is usually achieved in a neutral pH, some works have deliberately chosen acidic [40,41] or basic environments for better performance.…”

Section: Operating Potential Windowmentioning

confidence: 99%

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High‐Energy Aqueous Lithium Batteries

Eftekhari¹

2018

Advanced Energy Materials

158

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research, aqueous electrolytes were occasionally employed for the investigation of cathode materials instead of the conventional nonaqueous electrolytes. [9,10] It was discussed that the simplicity of an aqueous electrolyte provides a better opportunity for the fundamental studies of the process of intercalation/deintercalation of Li-ions as opposed to the nonaqueous electrolytes. For instance, although the formation of solid electrolyte interphase (SEI) is of utmost importance for the cyclability of LIB, the significant role of the electrolyte does not allow to exclusively study the electrochemical behavior of the electrode material under consideration. The current research has specifically targeted the development of ARLBs, but in practice, most of the recent papers have followed the same line of research in investigating a limited range of cathode and anode materials in the same aqueous electrolytes. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] A possible reason is that the key advantage of ARLBs was low cost, and thus, the focus was limited to a few inexpensive materials (e.g., lithium salts). Aqueous electrolytes are definitely excellent choices for the fundamental studies of electrode materials, but the practical development of ARLBs needs overcoming the key obstacles rather than finding more cathode materials.In any case, aqueous electrolytes were occasionally used during the 2000s by various research groups, but there was no vivid plan for the development of ARLBs. These works have been extensively reviewed before, [29][30][31][32][33] and it is not aimed to repeat the general works on aqueous electrolytes here. During the recent years, new opportunities have been introduced, which can extend the stable potential window of aqueous electrolyte to the range of 3-4 V. Upon this advancement, aqueous electrolytes can fairly compete with the conventional nonaqueous electrolytes for the fabrication of cheaper and safer LIBs. On the other hand, novel designs such as self-healing [34] or flexible [16,35,36] ARLBs have paved the path for new practical potentials of aqueous electrolytes. The present paper specifically focuses on the recent advancements and attempts to foster the strategy of research to shed light on the pathway of this emerging area of research. Two factors are directly responsible for achieving a high energy density, the specific capacity, and the cell voltage. Since the former is not massively controlled by the electrolyte and the specific capacity of most electroactive Owing to the high voltage of lithium-ion batteries (LIBs), the dominating electrolyte is non-aqueous. The idea of an aqueous rechargeable lithium battery (ARLB) dates back to 1994, but it had attracted little attention due to the narrow stable potential window of aqueous electrolytes, which results in low energy density. However, aqueous electrolytes were employed during the 2000s for the fundamental studies of electrode materials in the absence of side reactions such as the decomposition of organic spec...

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Section: Operating Potential Windowmentioning

confidence: 99%

“…Since the OER and HER potentials are controlled by pH, the potential window can be adjusted to cover the materials under consideration. Although the best performance is usually achieved in a neutral pH, some works have deliberately chosen acidic or basic environments for better performance.…”

Section: Conventional Aqueous Electrolytesmentioning

confidence: 99%

High‐Energy Aqueous Lithium Batteries

Eftekhari¹

2018

Advanced Energy Materials

158

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“…Qdl is the quantification of the energy used to align dipoles across Helmholtz double layer where the electrochemical reactions are taking place. Qdl is very low (in the range 10 -6 F cm -2 s 1-n ) in the cathode with 100% LiMnPO4 [20], which is the normal range for a surface with a negligible adsorption process. On the other hand, the Qdl variable is higher in the electrode with 100% MWCNTs where a significant fraction of water molecules are absorbed (in the range 10 -2 F cm -2 s 1-n ) [20].…”

mentioning

confidence: 92%

“…Qdl is very low (in the range 10 -6 F cm -2 s 1-n ) in the cathode with 100% LiMnPO4 [20], which is the normal range for a surface with a negligible adsorption process. On the other hand, the Qdl variable is higher in the electrode with 100% MWCNTs where a significant fraction of water molecules are absorbed (in the range 10 -2 F cm -2 s 1-n ) [20]. In the rest of the materials, the values of Qdl are around the same magnitude due to the primary effect of adsorption at the MWCNTs.…”

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confidence: 92%

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

2019

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An electrochemical characterization was performed in electrodes with different weight percentages of LiMnPO4 and multi-walled carbon nanotubes (MWCNTs) in aqueous solution. The redox potential of LiMnPO4 cathode is close to the electrolyte decomposition, which provides an ideal scenario to study multiple reactions on a single electrode surface involving parallel steps and species transformation in both solid and liquid state. Different processes were deconvoluted using cyclic voltammetry and electrochemical impedance spectroscopy. In addition, a surface coverage model was employed to theoretically quantify the limiting step of the electrochemical process. The results show the addition of MWCNTs increased the electrical conductivity of the cathode and improved the intercalation process in LiMnPO4. The optimal concentrations of MWCNTs, which enhanced the electrical properties and decreased the water oxidation effect, were 20 and 40 wt.%.

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Temperature effect on electrochemical properties of lithium manganese phosphate with carbon coating and decorating with MWCNT for lithium-ion battery

Robles

Camacho‐Montes

García-Casillas

et al. 2023

J Solid State Electrochem

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The ever-increasing demands for higher energy density and higher power capacity of Li-ion secondary batteries have led to a search for electrode materials whose capacities and performance are better than those available today. One candidate is lithium manganese phosphate, and it is necessary to understand its transport properties. These properties are crucial for designing high-power Li-ion batteries. In order to analyze the effect on the electronic conductivity with a conductor material, carbon nanotubes multiwalled, and glucose were used as a carbon source. Here the transport properties of LiMnPO 4 , LiMnPO 4 /C, and LiMnPO 4 /MWCNT are investigated using impedance spectroscopy. The electronic conductivity is found to increase with increasing the temperature from 2.92 x 10 − 5 S cm − 1 to 6.11 x 10 − 5 S cm − 1 . The magnetization curves are investigated, and antiferromagnetic behavior below 34K is reported for the three compositions. The structural characterizations were explored to con rm the phase formation of material with XRD, TEM, and SEM

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Comprehensive Interfacial Mechanisms of LiMnPO4-MWCNT Composite ratios in Acidic Aqueous Electrolyte

Cited by 10 publications

References 46 publications

High‐Energy Aqueous Lithium Batteries

High‐Energy Aqueous Lithium Batteries

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

Temperature effect on electrochemical properties of lithium manganese phosphate with carbon coating and decorating with MWCNT for lithium-ion battery

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