Electrochemical and spectroscopic characterization of an alumina-coated LiMn2O4 cathode with enhanced interfacial stability

Pasqualini, Marta; Calcaterra, Silvia; Maroni, Fabio; Rezvani, Seyed Javad; Cicco, Andrea Di; Alexander, Shirin; Rajantie, H.; Tossici, Roberto; Nobili, Francesco

doi:10.1016/j.electacta.2017.10.115

Cited by 25 publications

(34 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One of the promising strategies is surface modification of LMO grains with formation of a coating or thin film layers such as carbon, metallic, or ceramic oxides [ 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ]. This kind of modification can prevent direct contact between the electrolyte solution and the electrode material, helping to improve structural stability and suppress phase transitions [ 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ]. With its superior electrical characteristics, graphene has recently become the most sought-after addition for electrode materials.…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of Nanocrystalline LiMn2O4 Using Graphene Oxide Flakes

et al. 2021

View full text Add to dashboard Cite

In this work, a facile, wet chemical synthesis was utilized to achieve a series of lithium manganese oxide (LiMn2O4, (LMO) with 1–5%wt. graphene oxide (GO) composites. The average crystallite sizes estimated by the Rietveld method of LMO/GO nanocomposites were in the range of 18–27 nm. The electrochemical performance was studied using CR2013 coin-type cell batteries prepared from pristine LMO material and LMO modified with 5%wt. GO. Synthesized materials were tested as positive electrodes for Li-ion batteries in the voltage range between 3.0 and 4.3 V at room temperature. The specific discharge capacity after 100 cycles for LMO and LMO/5%wt. GO were 84 and 83 mAh g−1, respectively. The LMO material modified with 5%wt. of graphene oxide flakes retained more than 91% of its initial specific capacity, as compared with the 86% of pristine LMO material.

show abstract

Section: Introductionmentioning

confidence: 99%

Surface Modification of Nanocrystalline LiMn2O4 Using Graphene Oxide Flakes

et al. 2021

View full text Add to dashboard Cite

show abstract

“…It is known that nanomaterials exhibit enhanced physicochemical peoperies, − from which the layered and olivine-structured materials and in particular LiCoO 2 , LiNi x Mn y C z O 2 , and LiFePO 4 are among the most promising and efficiently implemented cathode materials − despite their main drawbacks as weight per stored energy, aging, and cyclability. , Out of these materials, lithium manganates are perfect candidates to reduce such limitations . Ideally, the stoichiometric spinel LiMn 2 O 4 ( Fd 3̅ m ) has a crystal structure with general formula A[B 2 ]O 4 , where A and B are divalent and trivalent ions in tetrahedral T d symmetry (Li + ions in the 8a tetrahedral site) and octahedral D 3 d symmetry (Mn + ions 16d site), respectively.…”

Section: Introductionmentioning

confidence: 99%

Does Alumina Coating Alter the Solid Permeable Interphase Dynamics in LiMn₂O₄ Cathodes?

et al. 2020

Self Cite

View full text Add to dashboard Cite

It is well known that the Al2O3 coating of the LiMn2O4 cathodes leads to improvement of the performance of these electrodes. However, the effect of the coating on the fundamental processes occurring on the interface with the active material which results in the formation of the solid permeable interphase is yet to be investigated. These effects should be more pronounced in the first cycle when a dynamic interaction of the active material at high voltage with the electrolyte and binder leads to the formation of this passivation layer. Here, we present a detailed investigation of the solid permeable interphase formation in alumina-coated and uncoated LiMn2O4 electrodes using X-ray absorption spectroscopy and analysis on the electrodes at the predesigned charging/discharging states. We demonstrate that the alumina coating leads to modification of the solid permeable layer and its dynamics. We also discuss the possible influences of interface modifications via coating on the battery performance.

show abstract

“…Disordered VO x could benefit from reducing their size to the nanoscale (Jagiello et al 2017;Pasqualini et al 2017;Sartale et al 2013) because of confinement effects over the electronic structure, e.g. quantum confinement enhancement of the work function (D'Elia et al 2020b;Zhou and Zachariah 2012), and because of a large effective surface area (Rezvani et al 2016b;Pinto et al 2016;Pinto et al 2018b).…”

Section: Introductionmentioning

confidence: 99%

Stoichiometry and disorder influence over electronic structure in nanostructured VOx films

et al. 2021

View full text Add to dashboard Cite

We present and discuss the role of nanoparticles size and stoichiometry over the local atomic environment of nanostructured VOx films. The samples have been characterized in situ using X-ray absorption near-edge structure (XANES) spectroscopy identifying the stoichiometry-dependent fingerprints of disordered atomic arrangement. In vanadium oxides, the ligand atoms arrange according to a distorted octahedral geometry depending on the oxidation state, e.g. trigonal distortion in V2O3 and tetragonal distortion in bulk VO2. We demonstrate, taking VO2 as a case study, that as a consequence of the nanometric size of the nanoparticles, the original ligands symmetry of the bulk is broken resulting in the coexistence of a continuum of distorted atomic conformations. The resulting modulation of the electronic structure of the nanostructured VOx as a function of the oxygen content reveals a stoichiometry-dependent increase of disorder in the ligands matrix. This work shows the possibility to produce VOx nanostructured films accessing new disordered phases and provides a unique tool to investigate the complex matter.

show abstract

Electrochemical and spectroscopic characterization of an alumina-coated LiMn2O4 cathode with enhanced interfacial stability

Cited by 25 publications

References 27 publications

Surface Modification of Nanocrystalline LiMn2O4 Using Graphene Oxide Flakes

Surface Modification of Nanocrystalline LiMn2O4 Using Graphene Oxide Flakes

Does Alumina Coating Alter the Solid Permeable Interphase Dynamics in LiMn₂O₄ Cathodes?

Stoichiometry and disorder influence over electronic structure in nanostructured VOx films

Contact Info

Product

Resources

About

Electrochemical and spectroscopic characterization of an alumina-coated LiMn2O4 cathode with enhanced interfacial stability

Cited by 25 publications

References 27 publications

Surface Modification of Nanocrystalline LiMn2O4 Using Graphene Oxide Flakes

Surface Modification of Nanocrystalline LiMn2O4 Using Graphene Oxide Flakes

Does Alumina Coating Alter the Solid Permeable Interphase Dynamics in LiMn2O4 Cathodes?

Stoichiometry and disorder influence over electronic structure in nanostructured VOx films

Contact Info

Product

Resources

About

Does Alumina Coating Alter the Solid Permeable Interphase Dynamics in LiMn₂O₄ Cathodes?