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Showing 1 to 11 of 11 for “"LiMn2O4"”.
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Novel Syntheses and Surface Modifications of Electrode Materials for Superior Lithium-Ion Batteries
… The effects of surface modifications for LiMn2O4 cathode materials are studied by depositing ultrathin conformal amphoteric oxides via atomic layer deposition (ALD). In the case of ZnO coating, the thickness of ZnO ALD layers can be finely optimized at atomic scale by varying ALD growth …
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Operando investigations of mechanical changes in lithium-ion batteries
… stiffness changes in lithium manganese oxide (LiMn2O4). Lithium insertion and removal results in asynchronous strain and stress generation in the electrode. Electrochemical stiffness changes are calculated by combining coordinated stress and strain measurements. The electrode experiences …
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In situ studies of surface reactions affecting Li-ion battery failure
… was applied to study the surface evolution of LiMn2O4 cathode material. A series of systematic experiments suggest that its poor cycle life results in part from the cyclic formation and decomposition of Li2CO3 that occurs upon cycling which in turn leads to CO/CO2 evolution. Finally, related …
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Investigating Cathode–Electrolyte Interfacial Degradation Mechanism to Enhance the Performance of Rechargeable Aqueous Batteries
… performance of LiNixMnyCo1-x-yO2, LiMn2O4 and LiFePO4 in the aqueous electrolytes. Combing surface- and bulk-sensitive techniques, we identify the roles played by surface exfoliation, structure degradation, transition metal dissolution and interface formation in terms of the …
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Synthesis of lithium manganese phosphate by controlled sol-gel method and design of all solid state lithium ion batteries
… using the composite solid electrolyte using LiMn2O4 as the symmetric electrodes. At different pressures, the performance of the solid state cell was studied.
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Surface studies of Li-ion and Mg battery electrodes
… further characterized for improved performance. LiMn2O4 Cathodes for Li-ion Batteries: Effect of Mn in electrolyte on anode and Au coating to minimize dissolution: LiMn2O4 (LMO) is known to dissolve Mn ions with cycling. This section focuses on both the effect of the dissolution of Mn2+ into the …
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Synthese und Charakterisierung von Spinellen im quasiternären System 'LiO 0,5 - MnOx - FeOx'
… Spinellverbindungen MnFe2O4, Li0.5Fe2.5O4, LiMn2O4 und Li4/3Mn5/3O4 im quaternären System Li-Mn-Fe-O unter jeweils definierten pO2/T-Bedingungen möglich ist. Die Synthesetemperaturen sind teilweise um 100°C bis 200°C niedriger als bei vergleichbaren Proben aus den Festkörpereaktionen. …
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Fabrication and demonstration of high energy density lithium ion microbatteries
… In chapter 4, Li-ion batteries based on the LiMn2O4-TiP2O7 couple are manufactured on flexible paper substrates; where the use of light-weight paper substrates significantly increase the gravimetric energy density of this electrode couple as compared to traditional metal current collectors. …
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Materials development for multicomponent systems with variable oxidation states
… the electrochemical performance of the LiMn2O4 (LMO4) composition was evaluated and compared against commercial LiMn2O4 powders. Moreover, for powders in the M1Ti2(PO3)4 (M1= Li, Na, K,) family, their thermal expansion behavior were studied by means of high resolution (synchrotron …
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Aerosol Synthesis Of Cathode Materials For Li-Ion Batteries
… In particular, flame-made nanostructured 4 V LiMn2O4 and 5 V LiNi0.5Mn1.5O4 cathode materials have shown comparable performance to those from conventional processes. A spray pyrolysis was also developed to address the synthetic conditions for synthesizing the integrated layered-layered …
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Growth and applicability of radiation-responsive silica nanowires
… Textured films of lithium manganese oxide (LiMn2O4), for use as positive materials, retain their unique texture after 30 cycles, as verified by scanning and transmission electron microscopy. Some accelerated capacity fade is however observed and attributed to chemical dissolution of the …