期刊
JOURNAL OF POWER SOURCES
卷 202, 期 -, 页码 253-261出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2011.11.037
关键词
Lithium titanate; Carbon coating; Reduction decomposition; Electrolyte; Solid electrolyte interface film
资金
- China Postdoctoral Science Foundation [20100470296]
- National Nature Science Foundation of China [50632040, 51072131]
- Shenzhen Technical Plan Project [JP200806230010A, SG200810150054A, JC201005310705A]
- Guangdong Province Innovation R&D Team Plan for Energy and Environmental Materials
The lithium ion batteries using Li4Ti5O12 as the anode material are easily being inflated during charge and discharge, which, however, does not occur in the batteries using graphite as the anode material. The high reduction reactivity of electrolyte on the Li4Ti5O12 material may be the main reason. In this work, the reduction reactivities of electrolyte on the uncoated and carbon-coated Li4Ti5O12 electrodes are compared for the first time. The results show that the reduction decomposition of electrolyte does occur on the uncoated Li4Ti5O12 electrode at around 0.7 V. while it only takes place at the first cycle on the carbon-coated Li4Ti5O12 electrode. The carbon coating layers cover the catalytic active sites of Li4Ti5O12 particles and separate the Li4Ti5O12 particles from the electrolyte. A successive solid electrolyte interface (SEI) film is formed on the carbon layer during the formation process, which can prevent the further reduction decomposition of electrolyte at around 0.7 V. The impurity phases of rutile and anatase TiO2 do not influence the reduction reactivity of electrolyte. This work is not only important to understand the reduction decomposition mechanism of electrolyte on the Li4Ti5O12 electrode, but also provides an effective solution to suppress the reduction decomposition of electrolyte in the batteries. (C) 2011 Elsevier B.V. All rights reserved.
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