Three-Dimensional LiMnPO4路Li3V2(PO4)3/C Nanocomposite as a Bicontinuous Cathode for High-Rate and Long-Life Lithium-Ion Batteries

详细信息    查看全文

• 作者：Yanzhu Luo ; Xu Xu ; Yuxiang Zhang ; Yuqiang Pi ; Mengyu Yan ; Qiulong Wei ; Xiaocong Tian ; Liqiang Mai
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：August 12, 2015
• 年：2015
• 卷：7
• 期：31
• 页码：17527-17534
• 全文大小：547K
• ISSN：1944-8252

文摘

Olivine-type LiMnPO₄ has been extensively studied as a high-energy density cathode material for lithium-ion batteries. To improve both the ionic and electronic conductivities of LiMnPO₄, a series of carbon-decorated LiMnPO₄路Li₃V₂(PO₄)₃ nanocomposites are synthesized by a facile sol鈥揼el method combined with the conventional solid-state method. The optimized composite presents a three-dimensional hierarchical structure with active nanoparticles well-embedded in a conductive carbon matrix. The combination of the nanoscale carbon coating and the microscale carbon network could provide a more active site for electrochemical reaction, as well as a highly conductive network for both electron and lithium-ion transportation. When cycled at 20 C, an initial specific capacity of 103 mA h g^鈥? can be obtained and the capacity retention reaches 68% after 3000 cycles, corresponding to a capacity fading of 0.013% per cycle. The stable capacity and excellent rate capability make this carbon-decorated LiMnPO₄路Li₃V₂(PO₄)₃ nanocomposite a promising cathode for lithium-ion batteries.