Electrochemical properties of niobium and phosphate doped spherical Li-rich spinel LiMn2O4 synthesized by ion implantation method
Electrochemical properties of niobium and phosphate doped spherical Li-rich spinel LiMn_2O_4 synthesized by ion implantation method作者机构：Department of Materials Physics and ChemistrySchool of Materials Science and EngineeringUniversity of Science and TechnologyBeijing 100083China New Energy Materials and Technology LaboratoryDepartment of Applied ChemistryCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China
出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)
年 卷 期：2017年第28卷第7期
页 面：1438-1446页
核心收录：
学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学]
主 题：Spinels Ion implantation Li ion batteries LiMn2O4 Doping
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 *** material was characterized by scanning electron microscopy,X-ray diffraction and BET specific surface area *** electrochemical performances were investigated with galvanostatic techniques and cyclic *** synthesis process was investigated with TG/*** results show that the lithium ion can be immersed into the pore of manganese dioxide at a low temperature with the ion implanted *** prepared materials have a higher discharge capacity and better crystallization than those prepared by solid phase *** doped Nb can improve the capacity of the Li-rich LMO spinel and reinforce the crystal growth along（111） and（400） *** crystal grains show circular and smooth morphology,which makes the specific surface area greatly ***-doped LMO spinel exhibits good high-rate capacity and structure *** 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 ℃.
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