The
poor electrochemical performance and potential safety hazards
caused by lithium dendrites have severely restricted the practical
application of Li metal anodes, although they are one of the most
promising anode candidates for future high-energy-density Li batteries.
One key point for inhibiting Li dendrites is to optimize the uniform
and stable interface between the electrode and electrolyte for homogeneous
electric field distribution. Here, the composite Li metal anode consisting
of the top three-dimensional (3D) surface layer, the middle aphroid
layer, and the bottom metallic Li is fabricated by the rolling method.
The 3D surface layer and composite aphroid layer based on lithiophilic
Ag-decorated carbon fibers enhance the uniformity and stability of
the interface between the electrode and electrolyte and facilitate
fast ion diffusion and electron transfer, which promote stable nondendritic
Li deposition. The composite Li anode exhibits a low overpotential
of only ∼20 mV after cycling for over 400 h at 1 mA cm–2. When paired with LiCoO2, the full cell
delivers excellent cycling performance of 500 cycles at 2C with a
capacity retention of over 84%. The design of the 3D structure layer
provides references for the industrial application of Li metals modified
by low-cost raw materials and simple methods.
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