Co-precipitation assisted hydrothermal method to synthesize Li0.9Na0.1Mn0.9Ni0.1PO4/C nanocomposite as cathode for lithium ion battery

摘要

A co-precipitation combined with hydrothermal method is adopted for synthesizing Li0.9Na0.1Mn1-xNixPO4/C (x = 0, 0.05, 0.1, 0.15, 0.2, 0.3) nanocomposites, using high specific surface area Li2.7Na0.3PO4 precursor, MnSO4 center dot H2O, Ni(NO3)(2)center dot 6H(2)O as raw materials. The X-ray diffraction analysis results shows doping ions have not destroy the crystal structure of olivine LiMnPO4/C composites. It can be also seen from the scanning electron microscope that the primary particles connect with each other on the surface at the nanometer scale. In all doping ratios, the obtained Li0.9Na0.1Mn0.9Ni0.1PO4/C composite shows excellent rate capability with the discharge capacity of 157.9 mAh/g and 150.5 mAh/g at 0.05 C and 1 C, respectively. With the increasing of cycle numbers, the capacity fades slightly. In conclusion, dual ion doping can significantly improve the lithium ion diffusion rate by broaden the transport channel. (c) 2018 Elsevier B.V. All rights reserved.