锂离子电池用氧化钨负极材料的改性

以碳纳米管薄膜（CMF）作为柔性基底，采用喷涂法将氧化钨（WO₃）和碳源（柠檬酸）固定在CMF上，形成碳包覆氧化钨/碳纳米管薄膜（WO₃@C/CMF）复合材料。采用冷冻干燥法和水热法对材料进行后续处理，分别得到了冷冻干燥型-碳包覆氧化钨/碳纳米管薄膜（F-WO₃@C/CMF）和水热型-碳包覆氧化钨/碳纳米管薄膜（H-WO₃@C/CMF）。结果发现H-WO₃@C/CMF中WO₃具有较好的分散度。通过对钨源和碳源质量配比的研究，发现钨源与柠檬酸质量比为1∶1时所得H-WO₃@C/CMF（1∶1）的电化学性能更优，首圈放电比容量为1 180 mAh/g，50圈循环后放电比容量仍有589 mAh/g。结果表明H-WO₃@C/CMF作为锂离子电池负极，有望提升其储锂性能。 

Modification of tungsten oxide as an anode electrode for lithium-ion batteries

In this paper, a carbon nanotube film (CMF) was used as a flexible substrate, and tungsten oxide (WO₃) and a carbon source (citric acid) were fixed on it by spraying method. Carbon-coated tungsten oxide/carbon nanotube film (WO₃@C/CMF) composites were thus formed. Freeze-dying hydrothermal tungsten oxide/carbon nanotube films (F-WO₃@C/CMF) and hydrothermal tungsten oxide/carbon nanotube films (H-WO₃@C/CMF) were obtained after using freeze-drying method and hydrothermal method. The results showed that the WO₃ particles in H-WO₃@C/CMF had better dispersion. It was found that the electrochemical performance of H-WO₃@C/CMF (1∶1) was better than others when the mass ratio of tungsten and citric acid was 1∶1. The specific discharge capacity of H-WO₃@C/CMF (1∶1) was 1 180 mAh/g in the first cycle and 589 mAh/g after 50 cycles. The results indicated that H-WO₃@C/CMF as the anode of a lithium-ion battery was expected to improve its lithium storage performance.