Effects of Lattice Defects on Cathode Properties of LiMn2O4 Synthesized at Low Temperatures for Lithium Ion Secondary Battery

Effects of lattice defects on cathode properties of LiMn2O4 synthesized at low temperatures were investigated. LiMn2O4 powders were synthesized by a sol-gel method. The specific capacities of LiMn2O4 decreased from 134 to 81 mAh g-1 with decreasing heating temperature from 750 to 200°C. X-ray absorption spectroscopy showed that a large amount of lattice defects such as cation vacancies existed and cation mixing occurred in LiMn2O4 calcined at low temperatures. It was found that the low specific capacities of LiMn2O4 calcined at low temperatures were attributed to these lattice defects.

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An X-ray Absorption Spectroscopy Study of the Ni K Edge in NiO−SiO2Nanocomposite Materials Prepared by the Sol−Gel Method

The Journal of Physical Chemistry B ◽

10.1021/jp9927911 ◽

1999 ◽

Vol 103 (46) ◽

pp. 10081-10086 ◽

Cited By ~ 34

Author(s):

A. Corrias ◽

G. Mountjoy ◽

G. Piccaluga ◽

S. Solinas

Keyword(s):

Absorption Spectroscopy ◽

Sol Gel ◽

Spectroscopy Study ◽

Gel Method ◽

X Ray ◽

Sol Gel Method ◽

X Ray Absorption

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Improvement of Ultra Soft X-ray Absorption Spectroscopy and Photoelectron Spectroscopy Beamline for Studies on Related Materials and Cathodes of Lithium Ion Batteries

e-Journal of Surface Science and Nanotechnology ◽

10.1380/ejssnt.2011.416 ◽

2011 ◽

Vol 9 ◽

pp. 416-421 ◽

Cited By ~ 11

Author(s):

Hideshi Ishii ◽

Koji Nakanishi ◽

Iwao Watanabe ◽

Toshiaki Ohta ◽

Kazuo Kojima

Keyword(s):

Lithium Ion Batteries ◽

Absorption Spectroscopy ◽

Photoelectron Spectroscopy ◽

Lithium Ion ◽

X Ray ◽

X Ray Absorption

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Analysis for the Electronic Structure at Cathode/Electrolyte Interface in Lithium-Ion Battery Via In Situ Total Reflection Fluorescence X-ray Absorption Spectroscopy

ECS Meeting Abstracts ◽

10.1149/ma2014-04/4/722 ◽

2014 ◽

Keyword(s):

Electronic Structure ◽

Lithium Ion Battery ◽

Absorption Spectroscopy ◽

Lithium Ion ◽

Total Reflection ◽

X Ray ◽

Electrolyte Interface ◽

X Ray Absorption

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Investigation of a porous NiSi 2 /Si composite anode material used for lithium-ion batteries by X-ray absorption spectroscopy

Journal of Power Sources ◽

10.1016/j.jpowsour.2016.05.137 ◽

2016 ◽

Vol 324 ◽

pp. 830-835 ◽

Cited By ~ 14

Author(s):

Dong Zhou ◽

Haiping Jia ◽

Jatinkumar Rana ◽

Tobias Placke ◽

Richard Klöpsch ◽

...

Keyword(s):

Lithium Ion Batteries ◽

Anode Material ◽

Absorption Spectroscopy ◽

Lithium Ion ◽

Composite Anode ◽

X Ray ◽

X Ray Absorption

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X-ray Diffraction and X-ray Absorption Spectroscopy Studies of Sol−Gel-Processed Zirconium Titanates

Chemistry of Materials ◽

10.1021/cm000298s ◽

2000 ◽

Vol 12 (11) ◽

pp. 3347-3355 ◽

Cited By ~ 28

Author(s):

J. Xu ◽

C. Lind ◽

A. P. Wilkinson ◽

S. Pattanaik

Keyword(s):

Absorption Spectroscopy ◽

Sol Gel ◽

X Ray Diffraction ◽

X Ray ◽

Spectroscopy Studies ◽

X Ray Absorption

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A compact furnace for in situ X-ray absorption spectroscopy: design, fabrication and study of cationic oxidation states in Pr6O11 and NiO

Journal of Synchrotron Radiation ◽

10.1107/s1600577520015696 ◽

2021 ◽

Vol 28 (2) ◽

pp. 455-460

Author(s):

Suchinda Sattayaporn ◽

Somboonsup Rodporn ◽

Pinit Kidkhunthod ◽

Narong Chanlek ◽

Chutarat Yonchai ◽

...

Keyword(s):

Oxidation State ◽

Absorption Spectroscopy ◽

Heating Temperature ◽

Reduction Process ◽

Oxidation States ◽

Quartz Tube ◽

Edge Structure ◽

X Ray ◽

X Ray Absorption

A well designed compact furnace has been designed for in situ X-ray absorption spectroscopy (XAS). It enables various heat ramps from 300 K to 1473 K. The furnace consists of heaters, a quartz tube, a circulated refrigerator and a power controller. It can generate ohmic heating via an induction process with tantalum filaments. The maximum heating rate exceeds 20 K min−1. A quartz tube with gas feedthroughs allows the mixing of gases and adjustment of the flow rate. The use of this compact furnace allows in situ XAS investigations to be carried out in transmission or fluorescence modes under controlled temperature and atmosphere. Moreover, the furnace is compact, light and well compatible to XAS. The furnace was used to study cationic oxidation states in Pr6O11 and NiO compounds under elevated temperature and reduced atmosphere using the in situ X-ray absorption near-edge structure (XANES) technique at beamline 5.2 SUT-NANOTEC-SLRI of the Synchrotron Light Research Institute, Thailand. At room temperature, Pr6O11 contains a mixture of Pr3+ and Pr4+ cations, resulting in an average oxidation state of +3.67. In situ XANES spectra of Pr (L 3-edge) show that the oxidation state of Pr4+ cations was totally reduced to +3.00 at 1273 K under H2 atmosphere. Considering NiO, Ni2+ species were present under ambient conditions. At 573 K, the reduction process of Ni2+ occurred. The Ni0/Ni2+ ratio increased linearly with respect to the heating temperature. Finally, the reduction process of Ni2+ was completely finished at 770 K.

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