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Scalable synthesis of ant-nest-like bulk porous silicon for high-performance lithium-ion battery anodes
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Scalable synthesis of ant-nest-like bulk porous silicon for high-performance lithium-ion battery anodes
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Journal Article
Scalable synthesis of ant-nest-like bulk porous silicon for high-performance lithium-ion battery anodes
2019
Overview
Although silicon is a promising anode material for lithium-ion batteries, scalable synthesis of silicon anodes with good cyclability and low electrode swelling remains a significant challenge. Herein, we report a scalable top-down technique to produce ant-nest-like porous silicon from magnesium-silicon alloy. The ant-nest-like porous silicon comprising three-dimensional interconnected silicon nanoligaments and bicontinuous nanopores can prevent pulverization and accommodate volume expansion during cycling resulting in negligible particle-level outward expansion. The carbon-coated porous silicon anode delivers a high capacity of 1,271 mAh g
−1
at 2,100 mA g
−1
with 90% capacity retention after 1,000 cycles and has a low electrode swelling of 17.8% at a high areal capacity of 5.1 mAh cm
−2
. The full cell with the prelithiated silicon anode and Li(Ni
1/3
Co
1/3
Mn
1/3
)O
2
cathode boasts a high energy density of 502 Wh Kg
−1
and 84% capacity retention after 400 cycles. This work provides insights into the rational design of alloy anodes for high-energy batteries.
Silicon is a promising anode material for lithium-ion batteries but experiences large volume changes during cycling. Here the authors report a scalable method to synthesize porous ant-nest-like silicons. The unique structure of this anode solves the swelling problem and enables impressive performance.
