期刊
NANO ENERGY
卷 26, 期 -, 页码 192-199出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2016.05.030
关键词
Si-based battery anodes; High-temperature cycling stability; Stable solid-electrolyte-interphase layers; Metal titanate coating layer; Dual coating layer
类别
资金
- IT RAMP
- D program of MOTIE/KEIT [10046306]
Nanostructured silicon is a promising candidate material for practical use in energy storage devices. However, high temperature operation remains a significant challenge because of severe electrochemical side reactions. Here, we show the design of ultra-durable silicon made by introducing dual coating layers on the silicon surface, allowing stable operation at high temperature. The double layers, which consist of amorphous metal titanate and carbon, provide several advantages including: (i) suppression of volume expansion during insertion; (ii) creation of a stable solid-electrolyte interface layer; and (iii) preservation of original Si morphology over 600 cycles at high temperature. The resulting silicon-based anode exhibits a reversible capacity of 990 mA h g(-1) after 500 cycles at 25 degrees C and 1300 mA h g(-1) after 600 cycles at 60 degrees C with a rate of 1 degrees C. (C) 2016 Elsevier Ltd. All rights reserved.
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