In-Situ X-Ray Diffraction Studies of Abused LiMn2O4–LiNi1/3Co1/3Mn1/3O2 Composite Cathode Materials in Li-Ion Batteries

The complexity of layered-spinel yLi2MnO3·(1 – y)Li1+xMn2–xO4 (Li:Mn = 1.2:1; 0 ≤ x ≤ 0.33; y ≥ 0.45) composites synthesized at different temperatures has been investigated by a combination of x-ray diffraction (XRD), x-ray absorption spectroscopy (XAS), and nuclear magnetic resonance (NMR). While the layered component does not change substantially between samples, an evolution of the spinel component from a high to a low lithium excess phase has been traced with temperature by comparing with data for pure Li1+xMn2–xO4. The changes that occur to the structure of the spinel component and to the average oxidation state of the manganese ions within the composite structure as lithium is electrochemically removed in a battery have been monitored using these techniques, in some cases in situ. Our 6Li NMR results constitute the first direct observation of lithium removal from Li2MnO3 and the formation of LiMnO2 upon lithium reinsertion.

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Gold model anodes for Li-ion batteries: Single crystalline systems studied by in situ X-ray diffraction

Electrochimica Acta ◽

10.1016/j.electacta.2008.03.014 ◽

2008 ◽

Vol 53 (21) ◽

pp. 6064-6069 ◽

Cited By ~ 24

Author(s):

F.U. Renner ◽

H. Kageyama ◽

Z. Siroma ◽

M. Shikano ◽

S. Schöder ◽

...

Keyword(s):

Li Ion Batteries ◽

X Ray Diffraction ◽

Single Crystalline ◽

X Ray ◽

Li Ion

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The Effect of Calcination Time on Crystallite Size of LiMn1.8Ni0.2O4 Cathode Materials

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.307.136 ◽

2020 ◽

Vol 307 ◽

pp. 136-140

Author(s):

Michelle Matius ◽

Norlida Kamarulzaman ◽

Mohd Sufri Mastuli ◽

Nor Syamilah Syamimi Mohd Abdillih ◽

Kelimah Elong

Keyword(s):

Crystallite Size ◽

Cathode Materials ◽

Single Phase ◽

Small Mass ◽

Li Ion Batteries ◽

X Ray Diffraction ◽

Calcination Time ◽

X Ray ◽

Li Ion ◽

Materials Used

Spinel LiMn2O4 is one of the promising cathode materials used in commercial Li-ion batteries. In this study, Ni was partially substituted in order to give the material LiMn1.8Ni0.2O4, which was successfully synthesized using a self-propagating combustion (SPC) method. Results from Simultaneous Thermogravimetric Analysis (STA) show the small mass loss about 4.6%. The precursor then was calcined at temperature of 800 °C for 24 h, 48 h and 72 h. X-Ray Diffraction (XRD) confirms that the final products are pure and single phase with no impurities present. The morphology and crystallite size of pure samples are examined using Field Emission Scanning Electron Microscope (FESEM). The result shows that all the materials consist of crystalline particles with smooth surface and polyhedral shaped materials.

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The Effect of Synthesis Temperature on Interlayer Mixing in Layered Rock Salt Cathode Materials LiNi0.7Mn0.1Co0.2O2 for Li-Ion Batteries Application

Materials Science Forum ◽

10.4028/www.scientific.net/msf.819.155 ◽

2015 ◽

Vol 819 ◽

pp. 155-160 ◽

Cited By ~ 1

Author(s):

S.P. Soo ◽

M.S. Idris ◽

Rozana A.M. Osman ◽

A. Rahmat

Keyword(s):

Rock Salt ◽

Cathode Materials ◽

Synthesis Temperature ◽

Li Ion Batteries ◽

Optimum Temperature ◽

X Ray Diffraction ◽

X Ray ◽

Layered Rock ◽

Suitable Temperature ◽

Li Ion

The interlayer mixing of layered rock salt cathode materials LiNi0.7Mn0.1Co0.2O2 that prepared by mixed hydroxide method at various temperatures (750-950°C) has been studied. X-ray Diffraction (XRD) was used to determine a suitable temperature range to obtain the fully reacted sample. Phase of pure sample was obtained at high temperature above 850°C. The results of XRD show that the LiNi0.7Mn0.1Co0.2O2 samples are iso-structural with α-NaFeO2 with space group of R-3m.The sample that heated at 900°C exhibits a well-ordered and lower cation mixed layered structure than others. Rietveld refinement using XRD data was used to determine the amount of interlayer mixing vary as a function of temperature. Refinements data showed that the interlayer mixing varies depend upon the synthesis temperature and the optimum temperature to prepare LiNi0.7Mn0.1Co0.2O2 with the lowest amount of interlayer mixing was 900°C.

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