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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.

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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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Electrochemical performances of the Li2NiTiO4/C nanocomposite. Charge-discharge curves at 0.05 C rate at room temperature (a) and 50°C (b), cycling performances at 0.05 C rate (c) and rate capability at room temperature (d). The inset in (a) shows the dQ/dV plot for the first cycle.
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Figure 5: Electrochemical performances of the Li2NiTiO4/C nanocomposite. Charge-discharge curves at 0.05 C rate at room temperature (a) and 50°C (b), cycling performances at 0.05 C rate (c) and rate capability at room temperature (d). The inset in (a) shows the dQ/dV plot for the first cycle.

Mentions: Figure 5a shows the galvanostatic charge-discharge curves of the Li2NiTiO4/C nanocomposite at 0.05 C rate (14.5 mA g-1) under room temperature. The charge/discharge capacities in the first, second, and third cycles are 180/115 mAh g-1, 128/111 mAh g-1, and 117/109 mAh g-1, respectively, with corresponding coulombic efficiencies of 64%, 87%, and 94%. The Li2NiTiO4/C exhibits superior electrochemical reversibility after the first cycle, which is in accordance with the CV result. The dQ/dV vs. potential plot for the first charge-discharge curve is presented in the inset in Figure 5a. Two oxidation peaks located at 4.2 and 4.5 V in the charge process may be ascribed to the two-step oxidation reactions of Ni2+/Ni3+ and Ni3+/Ni4+[10]. However, only one broad peak is observed at approximately 3.9 V belonging to Ni4+/Ni2+ in the discharge process, which may be resulted from strong hysteresis during the reduction of Ni4+ to Ni 2+ via Ni3+[16].


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

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

Electrochemical performances of the Li2NiTiO4/C nanocomposite. Charge-discharge curves at 0.05 C rate at room temperature (a) and 50°C (b), cycling performances at 0.05 C rate (c) and rate capability at room temperature (d). The inset in (a) shows the dQ/dV plot for the first cycle.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 5: Electrochemical performances of the Li2NiTiO4/C nanocomposite. Charge-discharge curves at 0.05 C rate at room temperature (a) and 50°C (b), cycling performances at 0.05 C rate (c) and rate capability at room temperature (d). The inset in (a) shows the dQ/dV plot for the first cycle.
Mentions: Figure 5a shows the galvanostatic charge-discharge curves of the Li2NiTiO4/C nanocomposite at 0.05 C rate (14.5 mA g-1) under room temperature. The charge/discharge capacities in the first, second, and third cycles are 180/115 mAh g-1, 128/111 mAh g-1, and 117/109 mAh g-1, respectively, with corresponding coulombic efficiencies of 64%, 87%, and 94%. The Li2NiTiO4/C exhibits superior electrochemical reversibility after the first cycle, which is in accordance with the CV result. The dQ/dV vs. potential plot for the first charge-discharge curve is presented in the inset in Figure 5a. Two oxidation peaks located at 4.2 and 4.5 V in the charge process may be ascribed to the two-step oxidation reactions of Ni2+/Ni3+ and Ni3+/Ni4+[10]. However, only one broad peak is observed at approximately 3.9 V belonging to Ni4+/Ni2+ in the discharge process, which may be resulted from strong hysteresis during the reduction of Ni4+ to Ni 2+ via Ni3+[16].

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