Synthesis, effect of γ-ray and electrical conductivity of uranium doped nano LiMn2O4 spinels for applications as positive electrodes in Li-ion rechargeable batteries

• Autorzy: El-Metwaly F G , Abou-Sekkina M. M , Saad F A , Khedr A. M.

Identyfikatory

DOI

10.2478/s13536-014-0236-7

• Języki publikacji: EN

Abstrakty

EN

LiMn2O4 is an attractive candidate cathode material for Li-ion rechargeable batteries, but it suffers from severe capacity fading, especially at higher temperature (55 ◦C) during charging/discharging processes. Recently, many attempts have been made to synthesize modified LiMn2O4. In this work, a new study on the synthesis of pure and U4+-doped nano lithium manganese oxide [LiMn2−xUxO4, (x = 0.00, 0.01, 0.03)] via solid-state method was introduced. The synthesized LiMn1.97U0.03O4 was irradiated by γ-radiation (10 and 30 kGy). The green samples and the resulting spinel products were characterized using thermogravimetric and differential thermal analysis (TG/DTA), X-ray diffraction (XRD), infrared (IR), and scanning electron microscopy (SEM) measurements. XRD and SEM studies revealed nano-sized particles in all prepared samples. Direct-current (DC) electrical conductivity measurements indicated that these samples are semiconductors and the activation energies decrease with increasing rare-earth U4+ content and γ-irradiation. ∆Ea equals to 0.304 eV for LiMn1.99U0.01O4, ∆Ea is 0.282 eV for LiMn1.97U0.03O4 and decreases to ∆Ea = 0.262 eV for γ-irradiated LiMn1.97U0.03O4 nano spinel. The data obtained for the investigated samples increase their attractiveness in modern electronic technology.

Słowa kluczowe

EN

U4+-doped nano lithium manganates; γ-ray effect; electrical conductivity

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2014
• Tom: Vol. 32, No. 4
• Strony: 571--577
• Opis fizyczny: Bibliogr. 48 poz., rys., tab., wykr.

Twórcy

autor

El-Metwaly F G

• Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt
• Chemistry Department, Faculty of Science, Jazan University, Jazan, Saudi Arabia

autor

Abou-Sekkina M. M

• Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt

autor

Saad F A

• Chemistry Department, College of Applied Sciences, Umm Al-Qura University, Makkah, Saudi Arabia

autor

Khedr A. M.

• Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt
• Chemistry Department, College of Applied Sciences, Umm Al-Qura University, Makkah, Saudi Arabia

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