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An electrospun lignin/polyacrylonitrile nonwoven composite separator with high porosity and thermal stability for lithium-ion batteries.
An electrospun lignin/polyacrylonitrile nonwoven composite separator with high porosity and thermal stability for lithium-ion batteries.
In this work, lignin/polyacrylonitrile composite fiber-based nonwoven membranes (L–PANs) were preparedby electrospinning with dispersing different amounts of lignin in the polyacrylonitrile (PAN) solutions. Theporosity of the L–PANs could reach 74%, which was significantly higher than that of the commercializedPP separator (42%). After exposure at 150 C for 15 min, the L–PANs showed no apparent dimensionalchange and no wrinkles, however, the commercialized PP separator shrank by 32%. At the same time,a Li/LiFePO4 battery using L–PANs as a separator delivered superior discharge C-rate capability andcycling performance compared to those using the commercialized PP separator at room temperature.More specifically, the discharge capacity of the cell containing L–PAN (3 : 7 by weight) could retain 148.9mA h g1 after 50 cycles at 0.2C and the discharge capacity retention was 95%.
