Synthesis and characterization of sulfur-doped carbon decorated LiFePO₄ nanocomposite as high performance cathode material for lithium-ion batteries

详细信息    查看全文

• 作者：Dong Xu ; ^{xud@zjweu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Peifeng Wang ; Biwen Shen
• 关键词：Lithium-ion batteries ; LiFePO4 ; Cathode material ; Sulfur-doped carbon
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：42
• 期：4
• 页码：5331-5338
• 全文大小：3218 K

文摘

This is the first report where crystalline sulfur-doped carbon decorated LiFePO₄ nanocomposite are employed as cathode material for lithium-ion batteries. The electrode has been synthesized via a sol–gel route, in which benzyl disulfide and oxalic acid are used as the sulfur and carbon source, respectively. Meanwhile, the as-synthesized sample is characterized by XRD, SEM, EDS mapping, TEM, Raman spectra, XPS and electrochemical techniques. The results reveal that the sulfur-doped carbon is uniformly coated on the surface of LiFePO₄ without destroying the crystal structure of the bulk material. Moreover, both the electronic conductivity and defect level of the carbon clearly increase, as a consequence, the electron and Li-ion diffusion of the electrode is further improved. As a cathode material for lithium-ion batteries, it exhibits a more outstanding electrochemical performance, especially the rate capability and long cyclic performance. Thus, it can be drawn a conclusion that the sulfur-doped carbon coating approach is an effective method to improve the electrochemical performance of LiFePO₄ and could be extended to modify other electrode materials for lithium-ion batteries.