利用氟化锂和盐酸对前驱体Ti₃AlC₂进行刻蚀，成功得到寡层Ti₃C₂T_x纳米片，通过真空抽滤将其负载至商用锂硫电池PE隔膜上，得到修饰层厚度约为710 nm的层状选择性透过Ti₃C₂T_x材料修饰PE隔膜。通过层间距筛分多硫化物和锂离子，该复合隔膜能够有效阻挡多硫化物的穿过，但不影响锂离子的传输。实验结果表明，选择性透过隔膜的锂硫电池具有优异的循环性能，在1 C倍率下，其初始比容量为750.3 mA·h/g，循环200圈后比容量仍然有481.3 mA·h/g，容量保持率高达64.15%。

Few-layer Ti₃C₂T_x nanosheets are successfully obtained by etching Ti₃AlC₂ with lithium fluoride and hydrochloric acid, and loaded on commercial PE separator through vacuum filtration to obtain a Ti₃C₂T_x modified lamellar permselective PE separator with a modification layer thickness of around 710 nm.Through sieving polysulfides and Li⁺ ion by layer spacing, the obtained separator can effectively suppress the diffusion of polysulfides to pass through the separator but show low hinderance to Li⁺ ion.It is shown through experiments that the Li-S battery with permselective Ti₃C₂T_x layer modified separator displays an improved cycle performance, which shows an initial specific capacity of 750.3 mAh·g^-1 at 1 C rate and still maintains at 481.3 mAh·g^-1 after 200 cycles, corresponding to a high capacity retention rate of 64.15%.

韩胜华(1997-),男,硕士研究生,研究方向为新型二维材料在锂硫电池中的应用,776816427@qq.com