期刊
CERAMICS INTERNATIONAL
卷 40, 期 8, 页码 13195-13204出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2014.05.025
关键词
Lithium ion batteries; Doping; Lithium titanate; Anode material; Spray drying
资金
- Hunan Provincial Innovation Foundation for Postgraduate [CX2012A004]
- Young Scholarship Award - Ministry of Education [1343-76140000019]
- China Scholarship Council [201206370083]
- National Basic Research Program of China [2014CB643406]
In spite of promising properties as anode material in lithium-ion batteries, lithium titanate (Li4Ti5O12) is far from perfection due to low electronic conductivity, which limits rate stability. To overcome this shortage, in this work, we developed a simple and low-cost procedure for the synthesis of Cr-doped Li4Ti5O12, which involves a versatile solution-based method, spray drying, which enables ion-level mixing of liquid components. Through galvanostatic charge discharge tests, the electrode made from Cr-doped Li4Ti5O12 microspheres shows much smaller hysteresis at high current density (e.g., 20 C) compared to plain Li4Ti5O12 samples. Besides, the Cr-doped microspheres achieve high rate stability of the capacity at higher current densities. The produced Cr-doped Li4Ti5O12 sample also performs excellent cycling stability at high current densities. The sample demonstrates 99.4%, 98.1%, 94.3% and 94.8% of its initial discharge capacities at 2 C, 5 C, 10 C and 20 C rates after 100 cycles, respectively. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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