Kinetics of electrochemical insertion of lithium ion into LiFePO4 from aqueous 2M Li2SO4 solution studied by potentiostatic intermittent titration technique

2011 ◽  
Vol 58 ◽  
pp. 247-257 ◽  
Author(s):  
H. Manjunatha ◽  
T.V. Venkatesha ◽  
G.S. Suresh
Keyword(s):  
Lithium Ion ◽  
Kinetics Of ◽  
Titration Technique ◽  
Potentiostatic Intermittent Titration Technique

scholarly journals Kinetics of electrochemical intercalation of lithium ion into Li[Li0.2Co0.3Mn0.5]O2 electrode from Li2SO4 solution

2021 ◽  
Vol 23 (09) ◽  
pp. 656-687
Author(s):  
K.C. Mahesh ◽  
◽  
G.S. Suresh ◽  
Keyword(s):  
Aqueous Electrolyte ◽  
Lithium Ion ◽  
Potential Drop ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Ohmic Potential Drop ◽  
Ion Intercalation ◽  
Time Invariant ◽  
Kinetics Of ◽  
Titration Technique

The kinetics of electrochemical lithium ion intercalation into Li[Li0.2Co0.3Mn0.5]O2 electrode in 2 M Li2SO4 aqueous electrolyte has been studied using two electroanalytical methods, namely, potentiostatic intermittent titration technique (PITT) and galvanostatic intermittent titration technique (GITT). The results are compared with those from nonaqueous electrolytes. Layered, lithium-rich Li[Li0.2Co0.3Mn0.5]O2 cathode material was synthesized by reactions under autogenic pressure at elevated temperature (RAPET) method. The effects of ohmic potential drop and charge-transfer resistance have been considered while predicting the current transients obtained with aqueous electrolyte. For PITT and GITT, we have defined their characteristic time-invariant functions, It1/2 and dE/dt1/2, respectively to present the diffusion time constant τ. Application of different theoretical diffusion models for treating the results obtained by the above-mentioned techniques allowed us to calculate the diffusion coefficient of lithium ions (D) at different potentials (E). The intercalation process is explained by considering the possible attractive interactions of the intercalated species in terms of Frumkin intercalation isotherm. We have observed a strictcorrespondence between the peaks of the intercalation capacitance and the minima in the corresponding log D vs. E curve.

scholarly journals Unexpected Role of Electronic Coupling between Host Redox Centers in Transport Kinetics of Lithium Ions in Olivine Phosphate Materials

2021 ◽  
Author(s):  
Yu Gao ◽  
Jun Huang ◽  
Yuwen Liu ◽  
Shengli Chen
Keyword(s):  
Activation Energy ◽  
Diffusion Coefficient ◽  
Lithium Ion ◽  
Transport Kinetics ◽  
Electronic Coupling ◽  
Lithium Ions ◽  
Kinetics Of ◽  
Olivine Phosphate ◽  
Redox Centers

The discrepancy between the trend in the diffusion coefficient of lithium ion (DLi+) and that in the activation energy of ion hopping signals hidden factors determining ion transport kinetics in...

scholarly journals PECULIARITIES OF PROCESS KINETICS OF FORMING CATHODE MATERIAL OF COMPOSITION LiХLaYMn1-YO2(C60)n FOR LITHIUM – ION BATTERY

2019 ◽  
Vol 62 (11) ◽  
pp. 99-105
Author(s):  
Ekaterina S. Guseva ◽  
Svetlana S. Popova
Keyword(s):  
Lithium Ion ◽  
Ion Concentration ◽  
Redox Activity ◽  
Solution Temperature ◽  
Stable Phase ◽  
Potential Range ◽  
Unusual Structure ◽  
Kinetics Of ◽  
New Phase ◽  
Mno2 Electrode

The effect of the magnitude of cathodic polarization and the temperature of a solution of lanthanum salicylate on the kinetics of the formation of elecrode LаyMn1-yO2 has been described. It has been established that two phases are formed on the electrode: the phase of the solid solution of the introduced lanthanum in MnO2 at potentials negative -2.5V turns into a new phase LаyMn1-yO2; last on the curve Eб/т-Ек the potential delay characteristic of the process of forming a new phase with an independent crystal lattice corresponds. Thus, to obtain a time-stable phase of the introduction of lanthanum into the structure of the electrode LаyMn1-yO2 the potential range from –2.9 V to –2.5 V can be recommended. The influence of the solution temperature on the kinetic characteristics of the process is ambiguous and is associated with a change in the degree of disorder in the structure of the forming phase at the boundary MnO2 electrode/solution (La3+), which hampers diffusion of ions La3+ into the electrode and leads to a decrease in ion concentration La3+, involved in the act of electrochemical introduction and, accordingly, to a decrease in the value of i (0). At temperatures above 10 °С the structure is stabilized and the characteristics (k, i (0)) increase. The composition of the formed phases is determined LixMnO2, LayMn1-yO2, LixLayMn1-yO2, current-free chronopotentiometry method calculated on the basis of equilibrium potentials Ep of these phases with pulsed galvanostatic polarization mode. Stability formed in the structure of MnO2 electrode chemical compounds of lanthanum was established. The activating effect of fullerene additives С60 composed of modified lanthanum LаyMn1-yO2 electrodes due to the high redox activity and the unusual structure of the molecules С60. Data on the effect of modified MnO2 electrodes on their potentials in an open circuit and during polarization in the working solution are in good agreement in terms of increasing the capacity of lithium with the results of cycling LiхMnO2, LiхLayMn1-yO2, LiхLayMn1-yO2-σ(C60)n in galvanostatic mode. The results of galvanostatic cycling showed that the discharge capacity of the electrodes increases in the series: LixMnO2 > LixLayMn1-yO2 > LiхLayMn1-yO2-σ(C60)n. With the help of cyclic chronovamperometry a good reversibility for LiхLayMn1-yO2-σ(C60)n electrode was established.

Sulfur‐doped shaddock peel–derived hard carbons for enhanced surface capacity and kinetics of lithium‐ion storage

2020 ◽  
Vol 44 (5) ◽  
pp. 4026-4037
Author(s):  
Ruizi Li ◽  
Jianfeng Huang ◽  
Jiayin Li ◽  
Liyun Cao ◽  
Xiaoyi Li ◽  
...  
Keyword(s):  
Lithium Ion ◽  
Ion Storage ◽  
Enhanced Surface ◽  
Kinetics Of

Electrochemical performance and lithium-ion intercalation kinetics of submicron-sized Li4Ti5O12 anode material

2013 ◽  
Vol 547 ◽  
pp. 107-112 ◽  
Author(s):  
Yan-Rong Zhu ◽  
Long-Cheng Yin ◽  
Ting-Feng Yi ◽  
Haiping Liu ◽  
Ying Xie ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Anode Material ◽  
Lithium Ion ◽  
Ion Intercalation ◽  
Kinetics Of ◽  
Li4ti5o12 Anode

Iron-nitrogen-carbon species boosting fast conversion kinetics of Fe1-xS@C nanorods as high rate anodes for lithium ion batteries

2018 ◽  
Vol 338 ◽  
pp. 726-733 ◽  
Author(s):  
Quanning Ma ◽  
He Song ◽  
Qianyu Zhuang ◽  
Jing Liu ◽  
Zhonghua Zhang ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
High Rate ◽  
Carbon Species ◽  
Kinetics Of

Fast and stable lithium-ion storage kinetics of anatase titanium dioxide/carbon onion hybrid electrodes

2018 ◽  
Vol 6 (20) ◽  
pp. 9480-9488 ◽  
Author(s):  
Eunho Lim ◽  
Hwirim Shim ◽  
Simon Fleischmann ◽  
Volker Presser
Keyword(s):  
Titanium Dioxide ◽  
Hybrid Materials ◽  
Sol Gel ◽  
Lithium Ion ◽  
Lithium Insertion ◽  
Carbon Onion ◽  
Ion Storage ◽  
Kinetics Of

In this work, we report on nanosized anatase TiO2/carbon onion hybrid materials (nano-TiO2–C) as a rapid and stable lithium insertion host easily synthesized by tailored sol–gel chemistry.

Theoretical elucidation of the energy conversion rate in organic photovoltaic cells of the fullerene nanostructure derivatives. A density functional theory study

2020 ◽  
Vol 19 (07) ◽  
pp. 2050025
Author(s):  
Nadjet Deddouche ◽  
Hafida Chemouri
Keyword(s):  
Density Functional Theory ◽  
Conversion Rate ◽  
Density Functional ◽  
Lithium Ion ◽  
Photovoltaic Cell ◽  
Energy Difference ◽  
Organic Photovoltaic ◽  
Mechanistic Study ◽  
Functional Theory ◽  
Kinetics Of

A comparative theoretical study of the kinetics of the Diels–Alder (DA) reaction between empty fullerene (C[Formula: see text]) and lithium ion encapsulated fullerene ([Formula: see text]) with 1,3 cyclohexadiene (C[Formula: see text]H[Formula: see text]) was carried out. This reaction takes place in a photovoltaic cell. The effect of the encapsulated [Formula: see text] ion on the conversion rate of solar energy into electricity has been highlighted through calculations based on the density functional theory (DFT). In addition, a static study using the global conceptual DFT indices, as part of the demonstration of the significant electrophilic power of the fullerene nanostructure, was carried out to show the effect of encapsulating the [Formula: see text] ion in this nanoparticle on the electrophilic power of Li[Formula: see text]@C[Formula: see text] and therefore on the acceleration of the reaction. The relationship between the HOMOdonor–LUMOacceptor energy difference and the DA reaction acceleration, and therefore the acceleration of light conversion (a rapid conversion implies a small gap), has been thoroughly examined. Moreover, a mechanistic study of the kinetics of the DA reaction of the fullerene involved in an organic photovoltaic cell has been carried out. In this section, a concerted synchronous mechanism with no effect of [Formula: see text] encapsulation on the synchronicity of the reaction was observed. Finally, it was revealed that Li[Formula: see text]@C[Formula: see text] reacted approximately 2466 times faster than C[Formula: see text]. Moreover, the experimental results were found in good agreement with the computer calculations.

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