Tailored Oxygen Framework of Li4Ti5O12 Nanorods for High-Power Li Ion Battery.
Here we designed the kinetically favored Li4Ti5O12 by modifying its crystal structure to improve intrinsic Li diffusivity for high power density. Our first-principles calculations revealed that the substituted Na expanded the oxygen framework of Li4Ti5O12 and facilitated Li ion diffusion in Li4Ti5O12 through 3-D high-rate diffusion pathway secured by Na ions. Accordingly, we synthesized sodium-substituted Li4Ti5O12 nanorods having not only a morphological merit from 1-D nanostructure engineering but also sodium substitution-induced open framework to attain ultrafast Li diffusion. The new material exhibited an outstanding cycling stability and capacity retention even at 200 times higher current density (20 C) compared with the initial condition (0.1 C).
†Department of Energy and Materials Engineering, Dongguk University-Seoul, 30, 1-gil, Pildong-ro, Jung-gu, Seoul 100-715, Republic of Korea.
Kyeongse
K
Song
‡Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Gwanak-ro 599, Gwanak-gu, Seoul 151-742, Republic of Korea.
Dong-Hwa
DH
Seo
†Department of Energy and Materials Engineering, Dongguk University-Seoul, 30, 1-gil, Pildong-ro, Jung-gu, Seoul 100-715, Republic of Korea.
Mi Ru
MR
Jo
§Korea Research Institute of Standards and Science (KRISS), 267 Gajeong, Yuseong, Daejeon 305-340, Republic of Korea.
Yong-Il
YI
Kim
‡Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Gwanak-ro 599, Gwanak-gu, Seoul 151-742, Republic of Korea.
Kisuk
K
Kang
†Department of Energy and Materials Engineering, Dongguk University-Seoul, 30, 1-gil, Pildong-ro, Jung-gu, Seoul 100-715, Republic of Korea.
Yong-Mook
YM
Kang
Li rechargeable battery; anode; ion exchange; kinetic; lithium titanium oxide