Citation: Li Wei, Siqin Gao-Wa, Zhu Zhi, Qi Lu, Tian Wen-Huai. Electrochemical properties of niobium and phosphate doped spherical Li-rich spinel LiMn₂O₄ synthesized by ion implantation method[J]. Chinese Chemical Letters, ;2017, 28(7): 1438-1446. doi: 10.1016/j.cclet.2017.03.035 shu

Electrochemical properties of niobium and phosphate doped spherical Li-rich spinel LiMn₂O₄ synthesized by ion implantation method

Li Wei ^a,, ,
Siqin Gao-Wa ^a ,
Zhu Zhi ^b ,
Qi Lu ^b ,
Tian Wen-Huai ^a

a.
Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology, Beijing 100083, China
b.
New Energy Materials and Technology Laboratory, Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

Corresponding author: Li Wei, liweimgl@163.com
Received Date: 20 December 2016
Revised Date: 7 February 2017
Accepted Date: 26 March 2017
Available Online: 29 July 2017

Figures(8)

Spherical Li-rich lithium manganese oxide (LMO) spinel material was synthesized by an ion implanted method assisted by polyalcohol doped with Niobium and Phosphate simultaneously. The material was characterized by scanning electron microscopy, X-ray diffraction and BET specific surface area analysis. The electrochemical performances were investigated with galvanostatic techniques and cyclic voltammetry. The synthesis process was investigated with TG/DSC. The results show that the lithium ion can be immersed into the pore of manganese dioxide at a low temperature with the ion implanted method. The prepared materials have a higher discharge capacity and better crystallization than those prepared by solid phase method. The doped Nb can improve the capacity of the Li-rich LMO spinel and reinforce the crystal growth along (111) and (400) planes. The crystal grains show circular and smooth morphology, which makes the specific surface area greatly decreased. Phosphate-doped LMO spinel exhibits good high-rate capacity and structure stability. The prepared Li_1.09Mn_1.87Nb_0.031O_3.99(PO₄)_0.021 delivers a discharge capacity of 119 mAh g^-1 at 0.2 C (1 C=148 mA g^-1) and 112.8 mAh g^-1 at 10 C, the discharge capacity retention reaches 98% at 1 ℃ after 50 cycles at 25 ℃ and 94% at 55 ℃.
- Spinels,
- Ion implantation,
- Li-ion batteries,
- LiMn₂O₄,
- Doping
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Electrochemical properties of niobium and phosphate doped spherical Li-rich spinel LiMn2O4 synthesized by ion implantation method

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通讯作者: 陈斌, bchen63@163.com

Electrochemical properties of niobium and phosphate doped spherical Li-rich spinel LiMn₂O₄ synthesized by ion implantation method