Nano-silicon composites have been extensively studied
as anode
materials for next-generation lithium-ion batteries due to their excellent
electrochemical performances. However, the high production cost and
complex synthesis methods of the composites are not conducive to their
practical application. Here, we aim to use low-cost raw materials
to prepare micron-scale carbon-coated porous silicon anode materials,
overcoming the problem of silicon volume expansion, while improving
the conductivity of anode and promoting the diffusion of lithium ions.
The reduced production cost of the micron-scale silicon-based anode
and its simple preparation method are beneficial to high tap density
and practical application. Due to the synergistic effect of the carbon
shell and porous structure, the prepared micron-scale silicon-based
anode shows good cycle stability, with a high specific capacity of
845 mA h g–1 after 150 cycles and a capacity retention
rate of 97.5% at a current density of 1000 mA g–1. Furthermore, the capacity retention is 83.7% after 300 cycles.
Full cells assembled with LiNi0.8Mn0.1Co0.1O2 cathode also exhibited good cycle stability
and high stack cell energy density.
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