中文关键词:三氧化钨WO_3-x/C纳米复合材料化学气相沉积法锂离子电池 英文关键词:Tungsten trioxideWO_3-x/C nanocompositeChemical vapor depositionLithium-ion battery 基金项目:河南省科技攻关重点项目（13210231252）资助

作者	单位
王宇婷	河南财政金融学院环境经济学院 郑州 450046

摘要点击次数:832 全文下载次数:0 中文摘要: 三氧化钨（WO₃）凭借其在锂离子电池中较高的理论比容量（~700mAh·g^-1）以及廉价易得的特性而引起了科研工作者广泛的研究兴趣，然而其相对较差的导电性以及在循环过程中所发生的较大体积变化导致其倍率性能和循环性能并不理想。为了增强其导电性，减缓体积变化所带来的负面影响，本文采用等离子体增强的化学气相沉积法成功地在所制备的WO_3-x纳米片上包覆含有氮元素掺杂的无定形碳。氮掺杂碳的包覆可以有效降低循环过程中发生的较大体积变化问题，而且可以提供更多的位点供锂离子进行嵌入/脱嵌。电化学测试表明，所制备的WO_3-x/C电极相比于WO_3-x电极和商业WO₃电极，展现出更好的倍率性能和循环性能。动力学模拟与计算表明，经过碳包覆的WO_3-x/C电极具有更小的电荷转移电阻和更快的锂离子扩散速率，从而有效提升其电化学性能。 英文摘要: By virtue of the high theoretical capacity (~700 mAh·g^-1) in lithium-ion battery and the comparatively low cost, tungsten trioxide (WO₃) has attracted great interest of researchers. However, it still suffers from its low conductivity and the severe volume variation during the discharge/charge processes, which lead to the inferior rate performance and cycling performance. To enhance its conductivity and mitigate the adverse effects caused by the volume variation, a plasma-enhanced chemical vapor deposition (PECVD) method was successfully used to coat nitrogen-doped amorphous carbon on defective WO_3-x nanosheets. N-doped amorphous carbon coating can effectively alleviate the unsatisfactory volume variation effects, and provide more sites for lithium-ions to insert and extract. The electrochemical evaluations demonstrated that the prepared WO_3-x/C electrode exhibits superior rate and cycle performance than that of WO_3-x electrode and commercial WO₃ electrode. Dynamic simulation and analysis suggested that the WO_3-x/C electrode has smaller charge transfer resistance and the faster lithium-ion diffusion coefficient, thereby effectively improving its electrochemical performance. 查看全文查看/发表评论下载PDF阅读器 相关附件：版权转让声明书 -->