Synthesizing kinetics and characteristics for spinel LiMn2O4 with the precursor using as lithium-ion battery cathode material

Zhao, Ming; Song, Xiao Ping

doi:10.1016/j.jpowsour.2006.11.001

Cited by 24 publications

(15 citation statements)

References 5 publications

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“…Pioneering research has studied in depth, by means of thermal analysis techniques, the decomposition of raw materials used in synthesis of LMO spinels by reaction in solid state and sol–gel, mainly, and thermal stability of spinel phase at high temperatures and different atmospheres [ 33 , 34 , 35 , 36 , 37 , 38 , 39 ]. However, only in [ 40 ] a dynamic study was carried out to determine kinetic parameters that were used as a theoretical basis to establish the optimal heat treatment conditions for synthesis of a stoichiometric LMO spinel by coprecipitation method, while no research was carried out on study of kinetics’ synthesis of doped LMO spinels.…”

Section: Introductionmentioning

confidence: 99%

Kinetic and Thermodynamic Studies on Synthesis of Mg-Doped LiMn2O4 Nanoparticles

2020

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In this work, a first study on kinetics and thermodynamics of thermal decomposition for synthesis of doped LiMn2O4 nanoparticles is presented. The effect of Mg doping concentration on thermal decomposition of synthesis precursors, prepared by ultrasound-assisted Pechini-type sol–gel process, and its significance on nucleation and growth of Mg-doped LiMn2O4 nanoparticles was studied through a method based on separation of multistage processes in single-stage reactions by deconvolution and transition state theory. Four zones of thermal decomposition were identified: Dehydration, polymeric matrix decomposition, carbonate decomposition and spinel formation, and spinel decomposition. Kinetic and thermodynamic analysis focused on the second zone. First-order Avrami-Erofeev equation was selected as reaction model representing the polymer matrix thermal decomposition. Kinetic and thermodynamic parameters revealed that Mg doping causes an increase in thermal inertia on conversion rate, and CO2 desorption was the limiting step for formation of thermodynamically stable spinel phases. Based on thermogravimetry experiments and the effect of Mg on thermal decomposition, an optimal two-stage heat treatment was determined for preparation of LiMgxMn2-xO4 (x = 0.00, 0.02, 0.05, 0.10) nanocrystalline powders as promising cathode materials for lithium-ion batteries. Crystalline structure, morphology, and stoichiometry of synthesized powders were characterized by XRD, FE-SEM, and AAS, respectively.

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Section: Introductionmentioning

confidence: 99%

Kinetic and Thermodynamic Studies on Synthesis of Mg-Doped LiMn2O4 Nanoparticles

2020

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“…Surface modification is currently one of the most widely used strategies for improving the cycling performance of cathode materials and is found to work particularly well on spinel LiMn 2 O 4 . − Spinel LiMn 2 O 4 is one of the most promising cathode materials for LIBs owing to its low cost, low toxicity, and a relatively high discharge potential of about 4.2 V (vs Li/Li + ). − However, its capacity fades dramatically during cycling, especially at elevated temperature, as a result of Jahn–Teller distortion of Mn 3+ and dissolution of Mn 2+ in the electrolyte . Surface modification can effectively inhibit side reactions at the electrode/electrolyte interface, resulting in better cyclability.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Nanosized Lithium-Ion-Conducting Solid Electrolyte Li_1.4Al_0.4Ti_1.6(PO₄)₃ and Its Mechanical Nanocomposites with LiMn₂O₄ for Enhanced Cyclic Performance in Lithium Ion Batteries

Liu

Tan

et al. 2017

ACS Appl. Mater. Interfaces

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Nanoparticles of fast lithium-ion-conducting solid electrolyte LiAlTi(PO) (LATP) are prepared by a modified citric-acid-assisted sol-gel method that involves a two-step heat treatment in which the dry gel is calcined first in argon and then in air. The obtained LATP exhibits smaller particle size (down to 40 nm) with a narrower size distribution and less aggregation than LATP prepared by a conventional sol-gel method because of a polymeric network that preserves during LATP crystallization. It has a high relative density of 97.0% and a high room-temperature conductivity of 5.9 × 10 S cm. The as-prepared superfine LATP is further used to composite with a spinel LiMnO cathode in lithium ion batteries by simple grinding. This noncoating speckled layer over the LiMnO particle surface has a minimal effect on the electronic conductivity of the electrode while offering excellent ionic conductivity. The cycling stability and rate capability of LiMnO are greatly improved at both ambient and elevated temperatures. After 100 cycles at 25 and 55 °C, the capacity retentions are 96.0% and 89.0%, respectively, considerably higher than the values of pristine LiMnO (61.0% at 25 °C; 51.5% at 55 °C) and mechanical LiMnO composite with LATP made by a conventional sol-gel method (85.0% at 25 °C; 71.4% at 55 °C).

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“…At lower temperatures, some Mn 2 O 3 may be present as an impurity. In comparison to the solid state method, the stoichiometry of the product can be controlled more precisely by the coprecipitation method [8][9][10]. The latter though requires a high temperature calcinations stage, which can lead to creation of hard agglomerates.…”

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confidence: 99%

Chemical syntheses of nanocrystalline lithium manganese oxide spinel

Michalska

Lipińska

Diduszko

et al. 2011

Phys. Status Solidi C

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The use of lithium manganese oxides in rechargeable lithium ion batteries has been stimulated due to their low cost and environmental compatibility. Especially, the interest of scientists concerns the oxide of the stable, spinel structured LiMn2O4. In the present work, this compound has been synthesized by three different methods viz., solid state reaction, modified sol–gel, and microwave hydrothermal techniques. The phase compositions of products were investigated by X‐ray powder diffraction (XRD) method and the surface morphology of nanopowders was examined by the scanning electron microscopy (SEM) (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Synthesizing kinetics and characteristics for spinel LiMn2O4 with the precursor using as lithium-ion battery cathode material

Cited by 24 publications

References 5 publications

Kinetic and Thermodynamic Studies on Synthesis of Mg-Doped LiMn2O4 Nanoparticles

Kinetic and Thermodynamic Studies on Synthesis of Mg-Doped LiMn2O4 Nanoparticles

Facile Synthesis of Nanosized Lithium-Ion-Conducting Solid Electrolyte Li_1.4Al_0.4Ti_1.6(PO₄)₃ and Its Mechanical Nanocomposites with LiMn₂O₄ for Enhanced Cyclic Performance in Lithium Ion Batteries

Chemical syntheses of nanocrystalline lithium manganese oxide spinel

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Synthesizing kinetics and characteristics for spinel LiMn2O4 with the precursor using as lithium-ion battery cathode material

Cited by 24 publications

References 5 publications

Kinetic and Thermodynamic Studies on Synthesis of Mg-Doped LiMn2O4 Nanoparticles

Kinetic and Thermodynamic Studies on Synthesis of Mg-Doped LiMn2O4 Nanoparticles

Facile Synthesis of Nanosized Lithium-Ion-Conducting Solid Electrolyte Li1.4Al0.4Ti1.6(PO4)3 and Its Mechanical Nanocomposites with LiMn2O4 for Enhanced Cyclic Performance in Lithium Ion Batteries

Chemical syntheses of nanocrystalline lithium manganese oxide spinel

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Facile Synthesis of Nanosized Lithium-Ion-Conducting Solid Electrolyte Li_1.4Al_0.4Ti_1.6(PO₄)₃ and Its Mechanical Nanocomposites with LiMn₂O₄ for Enhanced Cyclic Performance in Lithium Ion Batteries