Electrochemical performance of Al2O3-coated Fe doped LiCoVO4

Landschoot, N. Van; Kelder, E.M.; Kooyman, Patricia J.; Kwakernaak, C.; Schoonman, J.

doi:10.1016/j.jpowsour.2004.06.046

Cited by 41 publications

(34 citation statements)

References 27 publications

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“…[ 25 ] One important protection mechanism called HF-scavenging has been suggested due to experiments that show the amount of dissolved redox-active metal-ion is proportional to the amount of HF in the electrolyte, and both decrease in presence of an HF-scavenging oxide coating. [ 18,23,44 ] Myung et al [ 19 ] have confi rmed that Al 2 O 3 coatings react with HF and transform into AlF 3 …”

Section: Doi: 101002/aenm201400690mentioning

confidence: 99%

“…The only exception to this are a few s-block metal compounds but this is not critical, because their oxides and fl uorides both have very small conversion voltages in Figure 4 (below ≈1.0 V) which would presumably not be reached upon discharging a typical Li-ion battery (a typical discharge cutoff voltage is often around 3.0 V [18][19][20]28,34 ] Figure 5 encloses coatings inferior to the oxide/fl uoride of Al 3+ . For materials that are close in every panel such as Al 3+ and Mg 2+ , we expect a similar coating performance in terms of the metrics in Figure 5 .…”

Section: The Design Chart For Cathode Coatingsmentioning

confidence: 99%

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Thermodynamic Aspects of Cathode Coatings for Lithium‐Ion Batteries

Aykol

Kirklin

Wolverton

2014

Advanced Energy Materials

104

107

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Metal oxide cathode coatings are capable of scavenging the hydrofluoric acid (HF) (present in LiPF6‐based electrolytes) and improving the electrochemical performance of Li‐ion batteries. Here, a first‐principles thermodynamic framework is introduced for designing cathode coatings that consists of four elements: i) HF‐scavenging enthalpies, ii) volumetric and iii) gravimetric HF‐scavenging capacities of the oxides, and iv) cyclable Li loss into coating components. 81 HF‐scavenging reactions involving binary s‐, p‐ and d‐block metal oxides and fluorides are enumerated and these materials are screened to find promising coatings based on attributes (i‐iv). The screen successfully produces known effective coating materials (e.g., Al2O3 and MgO), providing a validation of our framework. Using this design strategy, promising coating materials, such as trivalent oxides of d‐block transition metals Sc, Ti, V, Cr, Mn and Y, are predicted. Finally, a new protection mechanism that successful coating materials could provide by scavenging the wide bandgap and low Li ion conductivity LiF precipitates from the cathode surfaces is suggested.

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Section: Doi: 101002/aenm201400690mentioning

confidence: 99%

Section: The Design Chart For Cathode Coatingsmentioning

confidence: 99%

Thermodynamic Aspects of Cathode Coatings for Lithium‐Ion Batteries

Aykol

Kirklin

Wolverton

2014

Advanced Energy Materials

104

107

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“…The electrolyte storage container for our previous experiments and present work is made from aluminum. Although reactions similar to the reaction with glass may be expected from Al, as the surface aluminum oxide can be attacked by HF 30 leading to increased concentration of decomposition products, a study of thermal electrolyte aging in the presence of aluminum is for several reasons of high interest. Aluminum is the essential part of a lithium ion battery as current collector for cathodes 8 and it is a promising material for some battery parts, for instance the cell cans.…”

Section: 26mentioning

confidence: 99%

Study of decomposition products by gas chromatography-mass spectrometry and ion chromatography-electrospray ionization-mass spectrometry in thermally decomposed lithium hexafluorophosphate-based lithium ion battery electrolytes

et al. 2015

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In this work, the thermal decomposition of a lithium ion battery electrolyte (1 M LiPF 6 in ethylene carbonate/ ethyl methyl carbonate, 50/50 wt%) with a focus on the formation of organophosphates was systematically studied. The quantification of non-ionic dimethyl fluorophosphate and diethyl fluorophosphate was performed with synthesized standards by gas chromatography-mass spectrometry. Due to absence of commercially available or synthesized standards for the monitoring of ionic methyl fluorophosphate, ethyl fluorophosphate and ethylene phosphate a method working with ion chromatography-electrospray ionization-mass spectrometry was developed, where dibutyl phosphate was used as an internal standard.In addition, an ion chromatography conductivity detection method with short analysis time for simultaneous determination and quantification of F À , PF 6 À and BF 4 À was developed. The formation and degradation of analytes was studied to show the dependence of different temperatures, electrolyte volumes and separator materials. The thermal aging experiments were carried out in gas-tight aluminum vials at 80 C for three weeks. After the storage time, the samples were diluted with the appropriate analysis solvents and investigated with gas chromatography-mass spectrometry, ion chromatography and ion chromatography-electrospray ionization-mass spectrometry. Finally, the thermal degradation of the electrolyte at 85 C after five days in aluminum and glass vials was studied.

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“…The formation of surface fluorides could be converted from coated oxides, or formed through complicated chemical reactions when Al 3þ or other cations exist in the REVIEW www.advmat.de LiPF 6 -based electrolyte. The possibility to form a surface layer driven by a chemical reaction may explain the facts that even a loose and incomplete oxide coating can still improve the performance of the cathode materials, [118][119][120] even when the coverage was as low as 13.7%. [120] Recently, Sun et al reported that a uniform 10 nm coating of AlF 3 on LiCoO 2 can improve the capacity retention at 3-4.5 V significantly.…”

mentioning

confidence: 99%

“…The possibility to form a surface layer driven by a chemical reaction may explain the facts that even a loose and incomplete oxide coating can still improve the performance of the cathode materials, [118][119][120] even when the coverage was as low as 13.7%. [120] Recently, Sun et al reported that a uniform 10 nm coating of AlF 3 on LiCoO 2 can improve the capacity retention at 3-4.5 V significantly. [121] They have extended this strategy to stabilize other layer-structured cathodes.…”

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confidence: 99%

Research on Advanced Materials for Li‐ion Batteries

et al. 2009

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In order to address power and energy demands of mobile electronics and electric cars, Li‐ion technology is urgently being optimized by using alternative materials. This article presents a review of our recent progress dedicated to the anode and cathode materials that have the potential to fulfil the crucial factors of cost, safety, lifetime, durability, power density, and energy density. Nanostructured inorganic compounds have been extensively investigated. Size effects revealed in the storage of lithium through micropores (hard carbon spheres), alloys (Si, SnSb), and conversion reactions (Cr2O3, MnO) are studied. The formation of nano/micro core–shell, dispersed composite, and surface pinning structures can improve their cycling performance. Surface coating on LiCoO2 and LiMn2O4 was found to be an effective way to enhance their thermal and chemical stability and the mechanisms are discussed. Theoretical simulations and experiments on LiFePO4 reveal that alkali metal ions and nitrogen doping into the LiFePO4 lattice are possible approaches to increase its electronic conductivity and does not block transport of lithium ion along the 1D channel.

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Electrochemical performance of Al2O3-coated Fe doped LiCoVO4

Cited by 41 publications

References 27 publications

Thermodynamic Aspects of Cathode Coatings for Lithium‐Ion Batteries

Thermodynamic Aspects of Cathode Coatings for Lithium‐Ion Batteries

Study of decomposition products by gas chromatography-mass spectrometry and ion chromatography-electrospray ionization-mass spectrometry in thermally decomposed lithium hexafluorophosphate-based lithium ion battery electrolytes

Research on Advanced Materials for Li‐ion Batteries

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