SiO2@NiO core-shell nanocomposites as high performance anode materials for lithium-ion batteries

作者：Wang Yourong; Zhou Wei; Zhang Liping; Song Guangsen; Cheng Siqing^*

来源：RSC Advances, 2015, 5(77): 63012-63016.

DOI：10.1039/c5ra11243e

SiO2@NiO core-shell nanocomposites of ca. 80 nm in diameter with a thin NiO shell were assembled via a facile online deposition of NiO and investigated as an anode for lithium ion batteries. The results indicated that the specific discharge capacity of the obtained SiO2@NiO core-shell nanocomposite electrode still retains 585 mA h g(-1) at a discharge current density of 100 mA g(-1) after 60 cycles and presents a coulombic efficiency of almost 100%, exhibiting good cycling stability and excellent rate capability after the first few cycles. This might be accounted for by the reversible lithiation/delithiation of the product Si due to the irreversible lithiation of SiO2 while the irreversible lithiation of NiO to produce metal Ni nanoparticles is responsible for the activation of SiO2, which is demonstrated by comparing the cyclic voltammetries (CVs) and electrochemical impedance spectra (EIS) of SiO2, NiO and SiO2@NiO electrodes.

• 出版日期2015
• 单位武汉轻工大学