Nitrogen-doped carbon decorated LiFePO₄ composite synthesized via a microwave heating route using polydopamine as carbon-nitrogen precursor

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• 作者：Bing Han^a ; ^b ; Xudong Meng^a ; ^b ; Lin Ma^a ; ^b ; Jingyu Nan^a ; ^b ; ^{jingyunan1961@sina.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Lithium-ion batteries ; Cathode material ; LiFePO4 ; Carbon coating ; Nitrogen-doping
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：1 February 2016
• 年：2016
• 卷：42
• 期：2
• 页码：2789-2797
• 全文大小：3743 K

文摘

Nitrogen-doped carbon decorated LiFePO₄ composite have been synthesized by using polydopamine as carbon–nitrogen precursor and investigated as a promising cathode for lithium-ion batteries. XRD patterns indicate that the nitrogen-doped carbon decorated LiFePO₄ has an olivine structure. TEM result shows that a uniform thin nitrogen-doped carbon layer with a thickness of about 3 nm is successfully coated on the surface of LiFePO₄ particles. Compared with the pristine LiFePO₄ sample, the nitrogen-doped carbon decorated LiFePO₄ composite has a high discharge capacity, good rate capability and stable cycling performance. The excellent electrochemical performance should be attributed to the enhanced electronic conductivity and increased Li⁺ ion diffusion of the electrode by the coating with nitrogen-doped carbon.