Magnetic properties of LiNi0.5Mn1.5O4 spinels prepared by wet chemical methods

Amdouni, Noureddine; Zaghib, Karim; Giligny, François; Mauger, A.; Julien, C.

doi:10.1016/j.jmmm.2006.06.018

Cited by 68 publications

(57 citation statements)

References 21 publications

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“…33,34 Our calculations also reproduce the oxidation states Mn 4+ and Ni 2+ at fully lithiated state and we find that only the oxidation state of Ni changes during cycling. The predicted lattice parameter is 8.32Å and 8.17 A for the fully lithiated state and fully delithiated state, respectively.…”

supporting

confidence: 53%

Revealing the coupled cation interactions behind the electrochemical profile of LixNi0.5Mn1.5O4

Lee

Persson

2012

Energy Environ. Sci.

114

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We present first-principles energy calculations and a cluster expansion model of the ionic ordering in Li x Ni 0.5 Mn 1.5 O 4 (0 ≤ x ≤ 1), one of the proposed highenergy density next-generation Li-ion cathode materials. The developed model predicts an intricate relationship between the preferred Li-vacancy ordering and the Ni/Mn configuration, which explains the difference in intermediate ground states between ordered (P4 3 32) and disordered (Fd3m) Ni/Mn configuration. The phase sequence as a function of lithiation as well as the voltage profile are well matched with experimental results. Understanding of the inherent chemical interactions and their impact on the performance of an energy storage material is essential when designing and optimizing Li-ion electrode materials.Li-ion batteries are poised to power the new generation of electric vehicles and thereby enable sustainable energy transportation. Among the most promising cathode materials, the lithium manganese spinel, LiMn 2 O 4 , has received attention due to its cheap price, non-toxicity, and good rate capability. 1,2 However, commercialization of LiMn 2 O 4 has been delayed due to capacity fade upon cycling, which has been attributed to the dissolution 3-5 of Mn 3+ produced by the redox process during lithiation/delithiation cycling. 6,7 Furthermore, it has been speculated that the strong Jahn-Teller distortion of the Mn 3+ ion degrades the structural stability of the material and inhibits Li migration. [8][9][10] Previous studies (see for example Ref. 3 and references therein) aimed at improving the cycling performance by substituting other transition metals into LiMn 2 O 4 suggest Li x Ni 0.5 Mn 1.5 O 4 as an attractive material.In Li x Ni 0.5 Mn 1.5 O 4 , the redox process occurs on the Ni site only, which prevents the creation of the Mn 3+ cation and its related problems. 11,12 Furthermore, the reduction of Ni 4+ to Ni 2+ occurs at 4.7 V, 3,11-15 which increases the total energy density of Li x Ni 0.5 Mn 1.5 O 4 as compared to LiMn 2 O 4 from 440 Wh/kg to 686 Wh/kg. 16 Despite the promising qualities of Li x Ni 0.5 Mn 1.5 O 4 for Liion battery applications, some of its fundamental properties have remained unexplained. For example, 1) the origin of the voltage step at Li 0.5 Ni 0.5 Mn 1.5 O 4 and its pronounced depen- * Corresponding author: eunseoklee@lbl.gov dence on the cation ordering, 11,17 2) the difference in rate capability, 11,18 and 3) the occurrence of reversible phase transitions between ordered and disordered Ni/Mn arrangement during charge/discharge cycling 1,19,20 are debated. Properties such as these provide the foundation for the long-time performance and we cannot rationally design or optimize electrode materials without understanding how the electrochemical signature depends on the structure and chemistry. In this communication, we present first-principles energy calculations and a coupled cluster expansion model of the ionic ordering and its effect on the electrochemical behavior of Li x Ni 0.5 Mn 1.5 O 4 . In particular, the mod...

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supporting

confidence: 53%

Revealing the coupled cation interactions behind the electrochemical profile of LixNi0.5Mn1.5O4

Lee

Persson

2012

Energy Environ. Sci.

114

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“…The signal is attributed to Mn 4+ ions which are responsible for the paramagnetic entities exist in the compound. It is emphasized that the charge state [23][24][25].…”

Section: Methodsmentioning

confidence: 99%

Synthesis of LiMn2O4 by molten salt technique

Helan¹,

Berchmans

Hussain³

2009

Ionics

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Lithium manganese oxide powders have been successfully prepared by a molten salt synthesis using eutectic mixture of LiCl and MnO 2 salt at 900°C. The synthesis was performed in open atmosphere. The crystalline powders were characterized for their phase identification using X-ray diffraction analysis. The physicochemical properties of the lithium manganese oxide powders are investigated by thermal analysis (thermo gravimetric analysis/ differential thermal analysis), Fourier transform infrared spectroscopy, Raman spectroscopy, atomic absorption spectroscopy, electron spin resonance spectroscopy, and scanning electron microscopy. This work shows the feasibility for obtaining lithium manganese oxide at lowtemperature molten salt flux method.

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“…Schematic drawing of the structures of LiNi 0.5 Mn 1.5 O 4 is shown in Fig. 1 [10]. [10] Infrared spectroscopy is an effective method to distinguish these two structures.…”

Section: Introductionmentioning

confidence: 99%

“…1 [10]. [10] Infrared spectroscopy is an effective method to distinguish these two structures. Infrared spectra of ordered (P4 3 32) and disordered (Fd3m) LiNi 0.5 Mn 1.5 O 4 exhibit different patterns between 650 and 450 cm -1 .…”

Section: Introductionmentioning

confidence: 99%

LiNi0.5Mn1.5O4 Spinel and Its Derivatives as Cathodes for Li-Ion Batteries

Liu¹

2012

Lithium Ion Batteries - New Developments

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Magnetic properties of LiNi0.5Mn1.5O4 spinels prepared by wet chemical methods

Cited by 68 publications

References 21 publications

Revealing the coupled cation interactions behind the electrochemical profile of LixNi0.5Mn1.5O4

Revealing the coupled cation interactions behind the electrochemical profile of LixNi0.5Mn1.5O4

Synthesis of LiMn2O4 by molten salt technique

LiNi0.5Mn1.5O4 Spinel and Its Derivatives as Cathodes for Li-Ion Batteries

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