Synthesis and electrochemical performance characterization of Ce-doped Li3V2(PO4)3/C as cathode materials for lithium-ion batteries
Synthesis and electrochemical performance characterization of Ce-doped Li3V2(PO4)3/C as cathode materials for lithium-ion batteries
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DOI：
10.1016/j.jpowsour.2013.05.113
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发表时间：
2013-12
影响因子：
9.2
通讯作者：
J. Dang;Feng Xiang;Ningyu Gu;Rongbin Zhang;R. Mukherjee;I. Oh;N. Koratkar;Zhenyu Yang
中科院分区：
文献类型：
--
作者：
J. Dang;Feng Xiang;Ningyu Gu;Rongbin Zhang;R. Mukherjee;I. Oh;N. Koratkar;Zhenyu Yang
本文采用简单、快速的微波辅助溶胶-凝胶法合成了一系列掺杂铈的锂离子电池正极材料Li3V2(PO4)3/C。Ce掺杂对Li3V2(PO4)3/C结构和电化学特性的影响研究表明，该复合材料具有更小的粒径、更低的电子转移电阻和更快的锂离子迁移速度，这是由于Ce掺杂改善了锂离子转移。在低充放电速率下，掺ce的Li3V1.98Ce0.02(PO4)3/C复合材料在超过100次循环中提供了稳定的比容量为~ 170 mAh g−1。在高倍率（例如10C）下，ce掺杂复合材料仍然能够提供高达~ 120mah g−1的稳定容量，比未掺杂的对应物高~ 60%。
In this paper, a series of Ce-doped Li3V2(PO4)3/C composite cathode materials for Li-ion batteries were synthesized by a facile and fast microwave assisted sol–gel route. The investigation of the influence of Ce doping on the structural and electrochemical characteristics of Li3V2(PO4)3/C shows that the resulting composite exhibits smaller particle size, lower electron-transfer resistance, and faster lithium ion migration, which are attributed to improved lithium ion transfer by the Ce doping. At low charge/discharge rates, the Ce-doped Li3V1.98Ce0.02(PO4)3/C composite delivers a stable specific capacity of ∼170 mAh g−1for over 100 cycles. At high rates (e.g. 10C), the Ce-doped composite is still able to deliver stable capacities of up to ∼120 mAh g−1which is ∼60% greater than its un-doped counterpart.