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In Situ Electrospinning Synthesis of N‐Doped C Nanofibers with Uniform Embedding of Mn Doped MFe 1− x Mn x PO 4 (M = Li, Na) as a High Performance Cathode for Lithium/Sodium‐Ion Batteries
Author(s) -
Chen Wenyan,
Xu Donghui,
Chen Yuancheng,
Tang Tang,
Kuang Shaojie,
Fu Haikuo,
Zhou Wuyi,
Yu Xiaoyuan
Publication year - 2020
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.202000684
Subject(s) - materials science , nanofiber , electrospinning , faraday efficiency , polyacrylonitrile , calcination , chemical engineering , electrochemistry , nanoparticle , doping , lithium (medication) , nanotechnology , composite material , electrode , polymer , organic chemistry , catalysis , chemistry , medicine , optoelectronics , endocrinology , engineering
Using polyvinyl alcohol and N‐rich polyacrylonitrile as carbon sources, uniform MFe 1– x Mn x PO 4 (M = Li, Na)/N‐doped C nanofibers are synthesized by sol–gel pretreatment and an electrospinning method followed by calcination. The as‐prepared nanofibers exhibit a 3D homogenous network with uniform distribution of MFe 1− x Mn x PO 4 nanoparticles. The lattice distorts after Mn‐doping without altering the original crystalline structure, increasing conductivity and enhancing the efficiency of Li + /Na + diffusion. When applied for lithium ion batteries, the optimized LiFe 0.8 Mn 0.2 PO 4 /C nanofibers deliver a considerable initial capacity of 169.9 mAh g −1 with coulombic efficiency of 92.4%. It also displays the excellent cycling stability with reversible capacity of 160 mAh g −1 after 200 cycles at 0.1 C and high rate performances with the specific capacity of 93 mAh g −1 at 5 C. Furthermore, NaFe x Mn 1− x PO 4 /N‐doped C nanofibers are also synthesized by the same method for sodium‐ion batteries, which exhibit an initial capacity of 134 mAh g −1 and specific capacity of 106 mAh g −1 at 0.1 C and 90 mAh g −1 at 1 C after 200 cycles. Owing to the facile fabrication process, these nanofibers are promising cathodes for lithium/sodium ion batteries with excellent electrochemical performances.