A silicon anode with ultra-high specific
capacity has motivated
tremendous exploration for high-energy-density lithium ion batteries
while it still faces serious issues of irreversible lithium loss,
unstable electrode electrolyte interface (SEI), and huge volume expansion.
Prelithiation is a crucial technology to alleviate the harm of active
lithium loss of silicon-based full-cell systems. Herein, we reported
a cathode prelithiation method using Li2S-PAN as a lithium
“donor”, which was synthesized via chemical reaction
between sulfurized polyacrylonitrile and Li-biphenyl complex. The
Li2S-PAN with an initial charging capacity of 668 mAh g–1 (2.5–4.0 V) is loaded on the LiFePO4 electrode, and the LiFePO4/Li2S-PAN composite
electrode displays a high initial charge capacity of 206 mAh g–1, which is 22.3% higher than the pristine LiFePO4. With a silicon/graphite/carbon (Si/G/C) composite anode,
the Si/G/C||LiFePO4/Li2S-PAN full cell exhibits
a reversible capacity of 123 and 107 mAh g–1 in
the 1st and 10th cycle, which is 15.5 and 24.5% higher than the Si/G/C||LiFePO4 battery, respectively. The SEI layer of the silicon anode
in the Si/G/C||LiFePO4/Li2S-PAN cell contains
abundant conductive LiF species, which can enhance the interfacial
stability and reaction kinetics of the cells. The proposed cathode
prelithiation process is compatible with the industrial roll-to-roll
electrode preparation process, exhibiting a promising application
prospect.
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