Carbon-coated Li4Ti5O12 Anode Materials Synthesized Using H2TiO3 as Ti Source
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2014年第11期
论文作者：Lijun Gong Yuxi Chen Hongjiang Yu Hongbo Liu Caifu Li Zhi-Quan Liu
文章页码：1092 - 1095
摘 要：Two low-cost synthesis routes have been developed to fabricate carbon-coated Li4Ti5O12 by using H2 Ti O3instead of anatase Ti O2 as Ti source through solid-state reaction process. One route is a direct solid mixture of H2 Ti O3, Li2CO3 and pitch followed by high-temperature solid-state reaction. The other includes mixture of H2 Ti O3and Li2CO3 with pitch dissolved in furanidine under vacuum and the same solid-state reaction procedure is followed after the mixture is totally dried. Microstructural investigations indicate that H2 Ti O3exhibits secondary aggregates morphology with primary particle sizes of 10e20 nm. Carbon-coating layers with thickness of 2e3 nm have been observed on Li4Ti5O12 synthesized by the two routes. Cyclic performance, rate capability and electrochemical impedance spectrum of the two Li4Ti5O12/C composites have been performed, which indicate that Li4Ti5O12/C obtained by furanidine-assisted mixture exhibits better electrochemical performance than Li4Ti5O12/C synthesized by direct solid mixture. The possible reasons have been discussed. The low-cost synthesis routes of Li4Ti5O12/C using H2 Ti O3as Ti source are expected to be more competitive than the traditional one for practical applications.
Lijun Gong1，Yuxi Chen1，Hongjiang Yu1，Hongbo Liu1，Caifu Li2，Zhi-Quan Liu2
1. College of Materials Science and Engineering,Hunan University2. Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences
摘 要：Two low-cost synthesis routes have been developed to fabricate carbon-coated Li4Ti5O12 by using H2 Ti O3instead of anatase Ti O2 as Ti source through solid-state reaction process. One route is a direct solid mixture of H2 Ti O3, Li2CO3 and pitch followed by high-temperature solid-state reaction. The other includes mixture of H2 Ti O3and Li2CO3 with pitch dissolved in furanidine under vacuum and the same solid-state reaction procedure is followed after the mixture is totally dried. Microstructural investigations indicate that H2 Ti O3exhibits secondary aggregates morphology with primary particle sizes of 10e20 nm. Carbon-coating layers with thickness of 2e3 nm have been observed on Li4Ti5O12 synthesized by the two routes. Cyclic performance, rate capability and electrochemical impedance spectrum of the two Li4Ti5O12/C composites have been performed, which indicate that Li4Ti5O12/C obtained by furanidine-assisted mixture exhibits better electrochemical performance than Li4Ti5O12/C synthesized by direct solid mixture. The possible reasons have been discussed. The low-cost synthesis routes of Li4Ti5O12/C using H2 Ti O3as Ti source are expected to be more competitive than the traditional one for practical applications.
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