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Sieving pores: stable,fast alloying chemistry of Si -electrodes in Li-ion batt
Silicon electrodes promise high energy for lithium-ion batteries but face swelling and durability issues. Here, the authors develop a sieving-pore design that enables stable, fast-charging silicon electrodes with long cycle life, low expansion, and industrial-scale potential.
CVD technology faces challenges in tightening the entrance size of mesopores and macropores to a sieving-pore structure due to the small molecular kinetic diameters of SiH 4 and C 2 H 2, while ultra-micropores (<1 nm) are easily fully occupied by the pyrolyzed Si or sealed by the deposited carbon, rendering them incapability of buffering or sieving (Fig. The results demonstrate that SSC negative electrodes with a sieving-pore structure effectively screen out solvents to minimize side reactions, fostering the formation of an inorganic-rich SEI within the pores, thereby promoting a stable interface and enabling rapid charge transfer. Working electrodes were prepared by casting the slurry onto one side of a copper current collector (Cu, purchased from Guangdong Canrd New Energy Technology Co., Ltd; used as received without further treatment; 9 μm thickness; 5 cm lateral dimension) using a doctor blade.
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