A study of electrochemical kinetics of lithium ion in organic electrolytes

Lee, Shung Ik; Jung, Un Ho; Kim, Yun Sung; Kim, Myung Hwan; Ahn, Dong June; Chun, Honggu

doi:10.1007/bf02699310

Cited by 80 publications

(41 citation statements)

References 17 publications

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“…When the salt concentration decreased from 0.25 M to 0.1 M, the discharge capacity decreases from 252.77 mAh/g to 67.21 mAh/g at 0.1 mA/cm 2 and discharge capacities decrease to almost zero at 0.4 and 0.5 mA/cm 2 . Since lower salt concentration leads to lower Li + diffusivity 34 and a sharp decrease of Li + concentration at reaction sites in the cathode electrode where Li + is consumed by the oxygen reduction reaction (ORR), the concentration over-potential of Li + increases and the discharge capacity decreases. Therefore, the lithium salt concentration should be higher than 0.25 M to avoid high concentration over-potential and achieve reasonable discharge and charge capacities.…”

Section: Resultsmentioning

confidence: 99%

Experimental Studies of Salt Concentration in Electrolyte on the Performance of Li-O₂Batteries at Various Current Densities

Mohazabrad

Wang

2016

J. Electrochem. Soc.

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This study has experimentally investigated effects of the salt concentration in electrolyte on the electrochemical performance of Li-O 2 battery at various current densities. Electrolyte solutions, made from bis(trifluoromethane)sulfonimide lithium salt (LiTFSI) in tetraethylene glycol dimethyl ether (TEGDME), with different concentrations between 0.005 M and 1 M were tested in the experiment. The viscosity and ionic conductivity of these electrolytes were measured. The first discharge-charge cycle tests were performed on Li-O 2 batteries at current densities from 0.1 to 0.5 mA/cm 2 . Both the discharge and charge capacities as well as the columbic efficiency decreased with increasing current density. Results also showed that specific discharge and charge capacities of batteries at very low salt concentration (≤0.25 M) were extremely low due to the insufficient oxygen and lithium ion and slow diffusion of lithium ion in electrolytes. The balance between the ionic conductivity and mass transfer determines that the optimized salt concentration, when the battery reached the highest discharge/charge capacities, is dependent on the current density. At lower current density (≤0.2 mA/cm 2 ), the highest capacity was obtained with the 0.75 M electrolyte, while at higher current density (0.3-0.5 mA/cm 2 ), the highest capacity was obtained with 1 M electrolyte. Li-O 2 batteries have received significant interest as one of the most promising technology for energy storage in the past few years due to its high theoretical energy density (1700 Wh/kg) compared with those of Li-ion batteries.1-3 Abraham and Jiang 4 first reported a Li-O 2 battery using organic electrolytes since the Li-O 2 aqueous electrolyte batteries suffered from metal corrosion by water. Generally, a rechargeable organic electrolyte Li-O 2 battery is composed of a lithium metal anode, a separator saturated with the organic electrolyte, and a porous cathode electrode (typically made from carbon or catalysts). During discharge, the lithium metal is oxidized to lithium ions at the anode, shown as Eq. 1. Meanwhile, oxygen from the surrounding dissolves in the liquid electrolyte, reacts with lithium ion, and generates solid Li 2 O 2 in the cathode electrode, which are shown as Eq. 2. During charge, the reversed cathodic reaction decomposes lithium peroxide and releases oxygen and lithium ion. The reversed anodic reaction deposits lithium metal at the anode electrode. The overall reaction is shown in Eq. 3 and the theoretical voltage, E 0 , of the reaction is 3.1 V. Cathode : 2LiSame electrochemical reactions take place in Li-air batteries, 6,7 in which O 2 is breathed from the ambient air. Since CO 2 and H 2 O in air would react with active components in batteries and deteriorate the performance, most laboratory experiments were conducted under pure O 2 environment. This experimental study was also carried out using pure oxygen and the term Li-O 2 battery is used throughout this paper. [8][9][10][11] Researches that focus on electrolyte solvents, lithium salts,...

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Section: Resultsmentioning

confidence: 99%

Experimental Studies of Salt Concentration in Electrolyte on the Performance of Li-O₂Batteries at Various Current Densities

Mohazabrad

Wang

2016

J. Electrochem. Soc.

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“…This electrolyte solution exhibits similar viscosity as the 1 M LiPF 6 -EC-DMC electrolyte commonly employed in lithium-ion batteries [30]. The electrical conductivity of the 1 M LiTFSI in PC electrolyte is σ 0 = 6.5 × 10 -3 S cm -1 at 25 °C.…”

Section: Electrolyte Solution and Uptakementioning

confidence: 93%

Effect of the degree of porosity on the performance of poly(vinylidene fluoride-trifluoroethylene)/poly(ethylene oxide) blend membranes for lithium-ion battery separators

et al. 2015

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“…This is also consistent with the observed inhibition of the Li + transport through the PPy layer. Li + ions in mixed organic electrolytes such as EC + DEC are solvated mainly with EC because of its high polarity and slightly higher donor number (EC = 16.4, DEC = 16) [30]. Matsuda et al have reported that though small participation of DEC in solvation was observed, Li-ions solvated preferentially to EC, and main solvated species were Li (EC) 2+ [31].…”

Section: Ex Situ Surface Analysis Of the Cycled Si(100) And Si(100)/pmentioning

confidence: 99%

The electrochemical behavior of poly 1-pyrenemethyl methacrylate binder and its effect on the interfacial chemistry of a silicon electrode

Haregewoin

Terborg

Zhang

et al. 2018

Journal of Power Sources

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The physico-chemical properties of poly (1-pyrenemethyl methacrylate) (PPy) are presented with respect to its use as a binder in a Si composite anode for Li-ion batteries. PPy thin-films on Si(100) wafer and Cu model electrodes are shown to exhibit superior adhesion as compared to conventional polyvinylidene difluoride (PVdF) binder. Electrochemical testing of the model bi-layer PPy/Si(100) electrodes in a standard organic carbonate electrolyte reveal higher electrolyte reduction current and an overall irreversible cathodic charge consumption during initial cycling versus the uncoated Si electrode. The PPy thin-film is also shown to impede lithiation of the underlying Si. XAS, AFM, TGA and ATR-FTIR analysis indicated that PPy binder is both chemically and electrochemically stable in the cycling potential range however significant swelling is observed due to a selective uptake of diethyl carbonate (DEC) from the electrolyte. The increased concentration of DEC and depletion of ethylene carbonate (EC) at the Si/PPy interface leads to continuous decomposition of the electrolyte and results in non-passivating behavior of the Si(100)/PPy electrode as compared to pristine silicon. Consequently, PPy binder improves the mechanical integrity of composite Si anodes but it influences mass transport at the Si(100)/ PPy interface and alters electrochemical response of silicon during cycling in an adverse manner.

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A study of electrochemical kinetics of lithium ion in organic electrolytes

Cited by 80 publications

References 17 publications

Experimental Studies of Salt Concentration in Electrolyte on the Performance of Li-O₂Batteries at Various Current Densities

Experimental Studies of Salt Concentration in Electrolyte on the Performance of Li-O₂Batteries at Various Current Densities

Effect of the degree of porosity on the performance of poly(vinylidene fluoride-trifluoroethylene)/poly(ethylene oxide) blend membranes for lithium-ion battery separators

The electrochemical behavior of poly 1-pyrenemethyl methacrylate binder and its effect on the interfacial chemistry of a silicon electrode

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A study of electrochemical kinetics of lithium ion in organic electrolytes

Cited by 80 publications

References 17 publications

Experimental Studies of Salt Concentration in Electrolyte on the Performance of Li-O2Batteries at Various Current Densities

Experimental Studies of Salt Concentration in Electrolyte on the Performance of Li-O2Batteries at Various Current Densities

Effect of the degree of porosity on the performance of poly(vinylidene fluoride-trifluoroethylene)/poly(ethylene oxide) blend membranes for lithium-ion battery separators

The electrochemical behavior of poly 1-pyrenemethyl methacrylate binder and its effect on the interfacial chemistry of a silicon electrode

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Experimental Studies of Salt Concentration in Electrolyte on the Performance of Li-O₂Batteries at Various Current Densities

Experimental Studies of Salt Concentration in Electrolyte on the Performance of Li-O₂Batteries at Various Current Densities