Microscale spherical carbon-coated Li4Ti5O12 as ultra high power anode material for lithium batteries

被引:431
作者
Jung, Hun-Gi [1 ,2 ]
Myung, Seung-Taek [3 ]
Yoon, Chong Seung [4 ]
Son, Seoung-Bum [1 ]
Oh, Kyu Hwan [5 ]
Amine, Khalil [6 ]
Scrosati, Bruno [1 ,7 ]
Sun, Yang-Kook [1 ,2 ]
机构
[1] Hanyang Univ, Dept WCU Energy Engn, Seoul 133791, South Korea
[2] Hanyang Univ, Dept Chem Engn, Seoul 133791, South Korea
[3] Iwate Univ, Dept Chem Engn, Morioka, Iwate 0208551, Japan
[4] Hanyang Univ, Dept Mat Sci & Engn, Seoul 133791, South Korea
[5] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151742, South Korea
[6] Argonne Natl Lab, Electrochem Technol Program, Chem Sci & Engn Div, Argonne, IL 60439 USA
[7] Univ Roma La Sapienza, Dept Chem, I-00185 Rome, Italy
关键词
RATE-CAPABILITY; SPINEL OXIDES; ELECTROCHEMISTRY; SYSTEM; SAFETY; HEAT;
D O I
10.1039/c0ee00620c
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Microscale C-Li4Ti5O12 particles with high tap density were synthesized by a simple solid-state reaction using TiO2, Li2CO3, and pitch. The effect of the carbon content on the physicochemical and electrochemical properties of this material was extensively studied. On calcination of the particles at high temperature in an inert atmosphere, the uniformly coated carbon layer from pitch inhibited the growth of primary particles, maintaining the spherical morphology, similar to the TiO2 precursor in size and shape, and also enabling partial reduction of the starting Ti4+ to Ti3+. Excellent electronic conductivity of the C-coated Li4Ti5O12 resulted from the presence of the highly conducting carbon coating layer and the mixed valence state of Ti3+ and Ti4+. Both the nanoporous morphology and highly conducting carbon coating layer in Li4Ti5O12 particles gave rise to ultra high rate capability.
引用
收藏
页码:1345 / 1351
页数:7
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