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Facile molten salt synthesis of Li2NiTiO4 cathode material for Li-ion batteries.

Wang Y, Wang Y, Wang F - Nanoscale Res Lett (2014)

Bottom Line: Well-crystallized Li2NiTiO4 nanoparticles are rapidly synthesized by a molten salt method using a mixture of NaCl and KCl salts.Conductive carbon-coated Li2NiTiO4 is obtained by a facile ball milling method.As a novel 4 V positive cathode material for Li-ion batteries, the Li2NiTiO4/C delivers high discharge capacities of 115 mAh g(-1) at room temperature and 138 mAh g(-1) and 50°C, along with a superior cyclability.

View Article: PubMed Central - HTML - PubMed

Affiliation: School of Chemistry and Materials Science, Huaibei Normal University, Huaibei, Anhui 235000, China.

ABSTRACT
Well-crystallized Li2NiTiO4 nanoparticles are rapidly synthesized by a molten salt method using a mixture of NaCl and KCl salts. X-ray diffraction pattern and scanning electron microscopic image show that Li2NiTiO4 has a cubic rock salt structure with an average particle size of ca. 50 nm. Conductive carbon-coated Li2NiTiO4 is obtained by a facile ball milling method. As a novel 4 V positive cathode material for Li-ion batteries, the Li2NiTiO4/C delivers high discharge capacities of 115 mAh g(-1) at room temperature and 138 mAh g(-1) and 50°C, along with a superior cyclability.

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Ex situ XRD patterns of the Li2NiTiO4/C electrode. (curve a) Uncharged, (curve b) charged to 4.9 V, (curve c) discharged to 2.4 V, and (curve d) after 2 cycles, at 2.4 V.
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Figure 6: Ex situ XRD patterns of the Li2NiTiO4/C electrode. (curve a) Uncharged, (curve b) charged to 4.9 V, (curve c) discharged to 2.4 V, and (curve d) after 2 cycles, at 2.4 V.

Mentions: In order to investigate the phase change of Li2NiTiO4 during the charge-discharge process, the ex situ XRD of the Li2NiTiO4/C electrode is employed as shown in Figure 6. XRD peaks corresponding to the Li2NiTiO4 phase are observed from the pristine cathode sheet. The positions of diffraction peaks are hardly changed during cycling, which indicates that the extraction/insertion of lithium cannot change the framework of Li2NiTiO4. However, the I220/I200 ratio is 0.43 before charging, 0.50 after charging to 4.9 V, 0.48 after discharging to 2.4 V, and 0.47 after 2 cycles. The I220/I200 ratios at different charge-discharge states are very close after the first charge, indicating an incompletely reversible structural rearrangement upon initial lithium extraction. Trócoli et al. [10] suggest that lithium ions move from 4a octahedral sites to 8c tetrahedral sites, resulting in an irreversible loss of crystallinity in the material during the first charge process. The above results together with the CV data suggest that the crystal structure can be mainly retained upon the process of lithium extraction/insertion.


Facile molten salt synthesis of Li2NiTiO4 cathode material for Li-ion batteries.

Wang Y, Wang Y, Wang F - Nanoscale Res Lett (2014)

Ex situ XRD patterns of the Li2NiTiO4/C electrode. (curve a) Uncharged, (curve b) charged to 4.9 V, (curve c) discharged to 2.4 V, and (curve d) after 2 cycles, at 2.4 V.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4012719&req=5

Figure 6: Ex situ XRD patterns of the Li2NiTiO4/C electrode. (curve a) Uncharged, (curve b) charged to 4.9 V, (curve c) discharged to 2.4 V, and (curve d) after 2 cycles, at 2.4 V.
Mentions: In order to investigate the phase change of Li2NiTiO4 during the charge-discharge process, the ex situ XRD of the Li2NiTiO4/C electrode is employed as shown in Figure 6. XRD peaks corresponding to the Li2NiTiO4 phase are observed from the pristine cathode sheet. The positions of diffraction peaks are hardly changed during cycling, which indicates that the extraction/insertion of lithium cannot change the framework of Li2NiTiO4. However, the I220/I200 ratio is 0.43 before charging, 0.50 after charging to 4.9 V, 0.48 after discharging to 2.4 V, and 0.47 after 2 cycles. The I220/I200 ratios at different charge-discharge states are very close after the first charge, indicating an incompletely reversible structural rearrangement upon initial lithium extraction. Trócoli et al. [10] suggest that lithium ions move from 4a octahedral sites to 8c tetrahedral sites, resulting in an irreversible loss of crystallinity in the material during the first charge process. The above results together with the CV data suggest that the crystal structure can be mainly retained upon the process of lithium extraction/insertion.

Bottom Line: Well-crystallized Li2NiTiO4 nanoparticles are rapidly synthesized by a molten salt method using a mixture of NaCl and KCl salts.Conductive carbon-coated Li2NiTiO4 is obtained by a facile ball milling method.As a novel 4 V positive cathode material for Li-ion batteries, the Li2NiTiO4/C delivers high discharge capacities of 115 mAh g(-1) at room temperature and 138 mAh g(-1) and 50°C, along with a superior cyclability.

View Article: PubMed Central - HTML - PubMed

Affiliation: School of Chemistry and Materials Science, Huaibei Normal University, Huaibei, Anhui 235000, China.

ABSTRACT
Well-crystallized Li2NiTiO4 nanoparticles are rapidly synthesized by a molten salt method using a mixture of NaCl and KCl salts. X-ray diffraction pattern and scanning electron microscopic image show that Li2NiTiO4 has a cubic rock salt structure with an average particle size of ca. 50 nm. Conductive carbon-coated Li2NiTiO4 is obtained by a facile ball milling method. As a novel 4 V positive cathode material for Li-ion batteries, the Li2NiTiO4/C delivers high discharge capacities of 115 mAh g(-1) at room temperature and 138 mAh g(-1) and 50°C, along with a superior cyclability.

No MeSH data available.


Related in: MedlinePlus