Fabrication and Characterization of Silver−V2O5 Composite Thin Films as Lithium-Ion Insertion Materials
Fabrication and Characterization of Silver−V2O5 Composite Thin Films as Lithium-Ion Insertion Materials
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DOI：
10.1021/cm020166u
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发表时间：
2002-06
影响因子：
8.6
通讯作者：
Y. C. and;Q. Qin
中科院分区：
文献类型：
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作者：
Y. C. and;Q. Qin
采用355 nm脉冲激光反应沉积法在不锈钢基体上制备了银-五氧化二钒复合薄膜。XRD和SEM分析表明，在300 °C的衬底温度下，在环境100 mTorr O2存在下沉积0.5 h的复合膜AgxV 2 O 5（x = 0.1 - 0.5）是非晶的，并且在沉积2 h后变成多晶结构。用XPS分析了Ag_xV_2 O_5复合膜中Ag和V的价态。该非晶态Ag0.5V2O5复合膜电极在4.0 - 1.0V范围内（2C倍率）的比容量高达396 mA·h/g，在20 C高倍率下的比容量保持在260 mA·h/g，循环1000次以上没有明显衰减。此外，AgxV 2 O 5复合膜的电子电导率比纯V2 O 5膜高2 - 3个数量级。Ag_xV_2 O_5复合膜的微观结构变化可能与其倍率性能和循环性能的显著提高有关。
Silver−vanadium pentoxide composite films have been fabricated by 355-nm pulsed laser reactive deposition on stainless steel substrates. XRD and SEM analyses showed that the composite films AgxV2O5 (x = 0.1−0.5) deposited at a substrate temperature of 300 °C in the presence of ambient 100 mTorr O2 for 0.5 h were amorphous and became a polycrystalline structure after 2 h of deposition. The valence states of Ag and V for AgxV2O5 composite film were examined by XPS measurement. The amorphous Ag0.5 V2O5 composite film electrode exhibited a specific capacity as high as 396 mA·h/g in the range of 4.0−1.0 V at a 2 C rate and remained at a capacity of 260 mA·h/g at a high rate of 20 C with no obvious fading upon cycling more than 1000 cycles. In addition, the electronic conductivities of AgxV2O5 composite films were 2−3 orders of magnitude higher than that of pure V2O5 film. The dramatically improved rate and cycling performance might be related to the changes in microstructure of the AgxV2O5 composite films.