The LiMn2O4 to Î»-MnO2 phase transition studied by in situ neutron diffraction

Berg, H. van den; Rundlöv, Håkan; Thomas, John O.

doi:10.1016/s0167-2738(01)00894-3

Cited by 76 publications

(71 citation statements)

References 8 publications

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“…A sample with Li x MnO 2 where x ¼ 0.11(8) gave a ¼ 8.155 Å . [203] An AF transition was found at T N ¼ 32 K, so f$3, suggesting a low level of frustration. Now, this material is isostructural with ZnCr 2 O 4 and has the same S ¼ 3/2 spin state but there was no evidence for a structural phase transition coincident with the magnetic transition.…”

Section: Spinelsmentioning

confidence: 99%

“…A subsequent mSR study supports this assignment and in addition finds that significant spin dynamics persist to low temperatures, the origin of which is likely the spins on the TP layers which appear to remain uncoupled. [203] (b) A-site magnetic spinels This is quite a new area where, with only a few exceptions, papers have appeared very recently. The first systematic study of A-site magnetic spinels appears to be that of Roth.…”

Section: Spinelsmentioning

confidence: 99%

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Geometrically Frustrated Magnetic Materials

Greedan¹

2010

Functional Oxides

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Section: Spinelsmentioning

confidence: 99%

Section: Spinelsmentioning

confidence: 99%

Geometrically Frustrated Magnetic Materials

Greedan¹

2010

Functional Oxides

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“…All reported in situ NPD data for battery components use lithium metal as the counter electrode [6][7][8][9][10][11][12][13], where the new material is measured electrochemically against lithium. The first in situ NPD study of a battery material used a cylindrical cell containing a lithium rod enveloped by the separator and approximately 5 g of electrode material encompassed in a Pyrex tube [12,13].…”

Section: Introductionmentioning

confidence: 99%

In situ neutron powder diffraction studies of lithium-ion batteries

Sharma

Peterson

2011

J Solid State Electrochem

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Neutron powder diffraction (NPD) offers many advantages in the analysis of battery materials. Understanding the relationship between the structural transformations of electrode materials and their electrochemical performance within lithium-ion batteries is crucial for further development of these technologies and is the overall goal of in situ NPD experiments. In this work, we present NPD data of electrode materials within batteries that are collected in situ during electrochemical cycling, including the commercially available materials LiCoO 2 , LiMn 2 O 4 , LiFePO 4 and graphite and the YFe(CN) 6 and FeFe(CN) 6 materials that are not commercially available. Using these data, we illustrate the experimental approach and requirements for the collection of in situ NPD data of sufficient quality for detailed structural analyses of the electrode components of interest within batteries.

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“…To date there have been six electrochemical cell designs for in situ NPD studies reported, including three cylindrical designs, 14,15,21,22 two cointype cell designs [23][24][25][26] and a pouch cell design. 12,27 The first cylindrical cell design was limited in use to very low charging/discharging rates due to the large quantities of electrode materials used.…”

mentioning

confidence: 99%

“…12,27 The first cylindrical cell design was limited in use to very low charging/discharging rates due to the large quantities of electrode materials used. 14,21 The roll-over design, 15 detailed below, and modified version of the original cylindrical cell, 22 have overcome many of the problems associated with the first cylindrical design, and can be used for reliably correlating the structure of electrode materials with their electrochemistry. Coin-cell designs for in situ NPD also allow similar quantities of electrode materials to be probed relative to the roll-over cell, while featuring subtle differences in terms of construction, applicable charging rates, and cost.…”

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confidence: 99%

<em>In Situ</em> Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries

Brant

Schmid

et al. 2014

JoVE

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Li-ion batteries are widely used in portable electronic devices and are considered as promising candidates for higher-energy applications such as electric vehicles.1,2 However, many challenges, such as energy density and battery lifetimes, need to be overcome before this particular battery technology can be widely implemented in such applications. 3 This research is challenging, and we outline a method to address these challenges using in situ NPD to probe the crystal structure of electrodes undergoing electrochemical cycling (charge/discharge) in a battery. NPD data help determine the underlying structural mechanism responsible for a range of electrode properties, and this information can direct the development of better electrodes and batteries.We briefly review six types of battery designs custom-made for NPD experiments and detail the method to construct the 'roll-over' cell that we have successfully used on the high-intensity NPD instrument, WOMBAT, at the Australian Nuclear Science and Technology Organisation (ANSTO). The design considerations and materials used for cell construction are discussed in conjunction with aspects of the actual in situ NPD experiment and initial directions are presented on how to analyze such complex in situ data. Video LinkThe video component of this article can be found at

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The LiMn2O4 to Î»-MnO2 phase transition studied by in situ neutron diffraction

Cited by 76 publications

References 8 publications

Geometrically Frustrated Magnetic Materials

Geometrically Frustrated Magnetic Materials

In situ neutron powder diffraction studies of lithium-ion batteries

<em>In Situ</em> Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries

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