Delicate construction of Si@SiOx composite materials by microwave hydrothermal for lithium-ion battery anodes
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Si@SiOx composite is successfully prepared by microwave hydrothermal method and is used as lithium-ion battery anode material. Delicate construction of the composite with uniform SiOx layer on Si nanoparticle surface can help to form stable solid electrolyte interphase layer. Moreover, the generated Li-oxide and Li-silicate can accommodate the volume changes caused by reaction of Si with Li+ during the charging and discharging processes, which help to leading superior cyclic performance. As an lithium-ion battery anode, the Si@SiOx composite electrode exhibits effectively improved electrochemical performance with initial reversible specific capacity of 1090.2 mAhg−1 and capacity retention as high as 95.9% (1045.4 mAhg−1) after 100 cycles. The method is mass-productive and benefit for the cyclic stability of Si anodes, which could be employed for high-performance lithium-ion batteries.
KeywordsSi anode Composite materials Solid electrolyte interphase Lithium-ion batteries
This work was supported by the National Key Research and Development Program of China (2018YFB2200500), the National Natural Science Foundation of China (61675195), the Fundamental Research Funds for the Central Universities (ZY1931), and the Opened Fund of the State Key Laboratory of Integrated Optoelectronics (IOSKL2018KF17).
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Conflict of interest
The authors declare that they have no conflict of interest.
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