高性能C-Sn/SnO2纤维复合物的合成及其储锂性能

采用静电纺丝法成功制备了碳纤维和C-Sn/SnO2纤维负极材料，并研究了其储锂性能。X射线衍射测试结果表明碳纤维具有典型的无定形碳特征。扫描电极测试结果表明，碳纤维和C-Sn/SnO2复合物由均匀的纤维组成，直径在200-300 nm。循环伏安测试表明，说明了碳纤维和C-Sn/SnO2纤维负极材料均具备较好的可逆性和结构稳定性。充放电测试表明，在500 mA·g-1的电流密度下，470次循环后，碳纤维和C-Sn/SnO2纤维负极材料的充放电容量分别为346/347 mAh·g-1和547/548 mAh·g-1，说明Sn/SnO2的添加提高了碳纤维的可逆容量；电化学阻抗谱测试结果表明，Sn/SnO2的添加降低了碳纤维的电荷转移电阻，提高了锂离子的传输动力学。

Synthesis and Lithium Storage Performance of C-Sn/SnO2 Fiber Composite as High-Performance Anode Material

Carbon fiber and C-Sn/SnO2 fiber anode materials were successfully prepared by electrospinning, and their lithium storage properties were studied. The results of X-ray diffraction test show that the carbon fiber has typical amorphous carbon characteristics. The scanning electron microscopy test results show that the carbon fiber and C-Sn/SnO2 composite are composed of uniform fibers with a diameter of 200-300 nm. Cyclic voltammetry test shows that carbon fiber and C-Sn/SnO2 fiber anode materials have good reversibility and structural stability. The charge-discharge test shows that the charge/discharge capacities of carbon fiber and C-Sn/SnO2 fiber anode materials at a current density of 500 mA·g-1 after 470 cycles are 346/347 and 547/548 mAh·g-1, respectively, indicating that the addition of Sn/SnO2 improves the reversible capacity of carbon fiber. The results of electrochemical impedance spectroscopy test shows that the addition of Sn/SnO2 reduces the charge transfer resistance of carbon fibers and improves the transport kinetics of lithium ions.