Enhanced capacity retention of Co and Li doubly doped LiMn2O4

Changyin, Wang; Lu, Shigang; Kan, Surong; Pang, Jinhui; Jin, Weiren; Zhang, Xiangjun

doi:10.1016/j.jpowsour.2008.09.104

Cited by 46 publications

(28 citation statements)

References 21 publications

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“…Doping is known to be an effective route. It is reported that substitution of Mn ions with other metals such as Li, Mg, Al, Cr, Co, Ni, Zn, Ga slows dissolution of Mn from the cathode into the electrolyte 15–27. Many researchers have reported that the introduction of cations with a low oxidation number increases the oxidation state of Mn ions.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the dissolution of Mn ions from LiMn₂O₄ cathode in the application of lithium ion batteries: First principle molecular orbital method

Kim

Lim

Kang

2012

Int J of Quantum Chemistry

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The dissolution phenomenon of Mn ions in LiMn 2 O 4 (LMO) cathode material for lithium ion batteries (LIBs) was investigated by a first principle calculation using the discrete variational Xa molecular orbital method. It was found that the oxidation number of Mn ions easily increases at high temperatures due to the empty levels of Mn 3d orbitals located in the vicinity of the Fermi energy level of LMO crystal. The changes of density of states (DOS) and Mn-O bonding properties with doping were examined. Analysis of DOS showed that the substitution of elements with a smaller oxidation number than Mn was found effective in keeping Mn ions at higher oxidation states. From the calculation of bonding properties, the dissolution of Mn was found to be strongly correlated with the covalent nature of Mn-O bond. Based on the results, we concluded that increasing the covalent character of Mn-O bond is effective to minimize the dissolution of Mn ions, along with suppressing the formation of Jahn-Teller-active Mn 3þ by inducing Mn ions at high oxidation state with proper selection of doping elements.

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Section: Introductionmentioning

confidence: 99%

Investigation on the dissolution of Mn ions from LiMn₂O₄ cathode in the application of lithium ion batteries: First principle molecular orbital method

Kim

Lim

Kang

2012

Int J of Quantum Chemistry

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“…Only spinel phase is observed, and it is indicated that the modication does not change the spinel structure of LiMn 2 O 4 . But due to atom size eect it can slightly change the lattice parameters [4]. The lattice parameters were calculated by the least-squares method using 10 diraction lines.…”

Section: Resultsmentioning

confidence: 99%

“…The rst strategy of doping is known to be an eective route. It is reported that substitution of Mn ions with other metals such as Mg, Al, Cr, Co, Ni, Zn, Mg, Ga slows dissolution of Mn into the electrolyte [4]. Partial replacing Mn, could increase the average valence of Mn in LiMn 2 O 4 (decreasing the Mn 3+ in LiMn 2 O 4 ), and could supress the Jahn-Teller eect [5].…”

Section: Introductionmentioning

confidence: 99%

Cr and V Substitution in the LiMn₂O₄Spinel Positive Electrode Li-Ion Batteries

Akbulut

Çetinkaya²,

Guler³

et al. 2015

Acta Phys. Pol. A

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In this study, LiCr0.2V0.4Mn1.4O4 cathode active electrode materials were produced via a facile sol-gel method at 800• C. The surfaces of the LiCr0.2V0.4Mn1.4O4 cathode active electrode materials were then coated with Cu in order to increase the conductivity and suppress the manganese ion dissolution into the electrolyte. The structure and electrochemical properties of the obtained Cr and V substituted LiMn2O4 powders were investigated by X-ray diraction (XRD), scanning electron microscopy (SEM), galvanostatic charge-discharge test and electrochemical impedance spectroscopy (EIS). The improvement in the cycling performances attributed to stabilization of spinel structure by bication ion substation and Cu coating on the spinel particles. EIS analysis conrmed that bication doping and conductive Cu coating contributed stability of the spinel electrodes and provided stable electrolyte/electrode interface due to the suppression of electrolyte decomposition

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“…Other effects take place when other transition metals such as iron and cobalt are added to LiMn 2 O 4 [49][50][51][52]. Discharge plateaus at high voltage were observed when adding iron in LiMn 2 O 4 , while the capacity retention improves during cycling for cobalt-doped electrodes.…”

Section: Cathode Materialsmentioning

confidence: 99%

Recent Progress in Structural and Electrochemical Properties in Composite Based LiFePO4 Batteries

Tabassam

Manzoor

2015

J. New Mat. Electrochem. Sys.

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This review describes some recent developments in the composite doped cathode materials such as LiCoO2, LiNiO2, LiMn2O4, and LiMnO2 with focus on LiFePO4. Olivine LiFePO4 have attracted considerable attention since last decade because of its promising properties as a cathode material in Li ion based batteries (LIBs), that is, it offers high theoretical capacity, environmental friendliness, and less toxicity. The electrochemical and structural characterization of this system will be discussed in more detail as compared with its other counterpart.

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Enhanced capacity retention of Co and Li doubly doped LiMn2O4

Cited by 46 publications

References 21 publications

Investigation on the dissolution of Mn ions from LiMn₂O₄ cathode in the application of lithium ion batteries: First principle molecular orbital method

Investigation on the dissolution of Mn ions from LiMn₂O₄ cathode in the application of lithium ion batteries: First principle molecular orbital method

Cr and V Substitution in the LiMn₂O₄Spinel Positive Electrode Li-Ion Batteries

Recent Progress in Structural and Electrochemical Properties in Composite Based LiFePO4 Batteries

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Enhanced capacity retention of Co and Li doubly doped LiMn2O4

Cited by 46 publications

References 21 publications

Investigation on the dissolution of Mn ions from LiMn2O4 cathode in the application of lithium ion batteries: First principle molecular orbital method

Investigation on the dissolution of Mn ions from LiMn2O4 cathode in the application of lithium ion batteries: First principle molecular orbital method

Cr and V Substitution in the LiMn2O4Spinel Positive Electrode Li-Ion Batteries

Recent Progress in Structural and Electrochemical Properties in Composite Based LiFePO4 Batteries

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Product

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Investigation on the dissolution of Mn ions from LiMn₂O₄ cathode in the application of lithium ion batteries: First principle molecular orbital method

Investigation on the dissolution of Mn ions from LiMn₂O₄ cathode in the application of lithium ion batteries: First principle molecular orbital method

Cr and V Substitution in the LiMn₂O₄Spinel Positive Electrode Li-Ion Batteries