Shin, Jin-Wook Chung, Kyung Yoon Ryu, Ji Heon Park, In-Wook Yoon, Dang-Hyok 2024-01-20T14:34:24Z 2024-01-20T14:34:24Z 2021-09-04 2012-06 0947-8396 https://pubs.kist.re.kr/handle/201004/129228 Li4Ti5O12 for anodic active material of lithium ion batteries is synthesized using different Li/Ti ratios of 3.5/5.0, 4.0/5.0 and 4.5/5.0 by a solid-state reaction between Li2CO3 and anatase TiO2 at 850 A degrees C. All samples contain a small amount of transformed rutile TiO2 in the final Li4Ti5O12, where the amount of rutile TiO2 decreases with the increase in Li/Ti ratio. A stoichiometric Li4Ti5O12 with Li/Ti = 4.0/5.0 shows a slightly larger particle size and higher charge capacity than those of Li-deficient and Li-excessive particles, while the discharging rate capability is shown to mainly depend on particle size regardless of Li/Ti ratio. According to the time-resolved X-ray diffraction patterns using a synchrotron source, however, no significant difference is found in spite of the difference in Li/Ti ratio, indicating the structural stability of Li4Ti5O12 during the Li insertion and extraction process. English SPRINGER HEIDELBERG ANODE MATERIAL RUTILE TRANSFORMATION LITHIUM INSERTION TITANIUM-OXIDE TIO2 ANATASE SPINEL DIFFUSION PERFORMANCE ELECTRODE Effects of Li/Ti ratios on the electrochemical properties of Li4Ti5O12 examined by time-resolved X-ray diffraction Article 10.1007/s00339-012-6912-8 1 APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, v.107, no.4, pp.769 - 775 APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 107 4 769 775 scie scopus 000304401300003 2-s2.0-84861571192 Materials Science, Multidisciplinary Physics, Applied Materials Science Physics Article ANODE MATERIAL RUTILE TRANSFORMATION LITHIUM INSERTION TITANIUM-OXIDE TIO2 ANATASE SPINEL DIFFUSION PERFORMANCE ELECTRODE Li4Ti5O12 time resolved XRD lithium secondary batteries cathode