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Electrochemical properties of niobium and phosphate doped spherical Li-rich spinel LiMn2O4 synthesized by ion implantation method 被引量:2

Electrochemical properties of niobium and phosphate doped spherical Li-rich spinel LiMn_2O_4 synthesized by ion implantation method
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摘要 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(1.09)Mn(1.87)Nb(0.031)O(3.99)(PO4)(0.021)delivers a discharge capacity of 119mAhg^-1 at 0.2C(1C=148mAg^-1) and 112.8 mAhg^-1 at 10 C,the discharge capacity retention reaches 98% at 1 ℃ after 50 cycles at 25 ℃ and 94% at 55 ℃. 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(1.09)Mn(1.87)Nb(0.031)O(3.99)(PO4)(0.021)delivers a discharge capacity of 119mAhg^-1 at 0.2C(1C=148mAg^-1) and 112.8 mAhg^-1 at 10 C,the discharge capacity retention reaches 98% at 1 ℃ after 50 cycles at 25 ℃ and 94% at 55 ℃.
出处 《Chinese Chemical Letters》 SCIE CAS CSCD 2017年第7期1438-1446,共9页 中国化学快报(英文版)
基金 supported by a grant from the National High Technology Research and Development Program of China(863 Program)(No.2008AA11A102)
关键词 Spinels Ion implantation Li-ion batteries LiMn2O4 Doping Spinels Ion implantation Li-ion batteries LiMn2O4 Doping
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