Synthesis and electrochemical properties of high performance polyhedron sphere like lithium manganese oxide for lithium ion batteries

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DOIResolve DOI: http://doi.org/10.1016/j.jallcom.2015.01.182
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleJournal of Alloys and Compounds
ISSN0925-8388
Volume632
Pages222228; # of pages: 7
SubjectCathodes; Charge transfer; Cyclic voltammetry; Diffusion; Electric batteries; Electric discharges; Electrochemical impedance spectroscopy; Electrodes; Geometry; Ions; Lithium; Lithium alloys; Lithium compounds; Manganese; Manganese oxide; Nanorods; Oxides; Secondary batteries; Solid state reactions; Spheres; Synthesis (chemical); BET surface area; Brunauer emmett tellers; Cath-ode materials; Charge transfer resistance; Electrochemical performance; Galvanostatic charge discharges; Lithium manganese oxide; Polyhedron sphere like; Lithium batteries
AbstractPolyhedron structured sphere-like lithium manganese oxide (LiMninf2/infOinf4/inf) is successfully synthesized from β-MnOinf2/inf nanorod precursor via a solid state reaction at a temperature of 800 °C. For comparison, LiMninf2/infOinf4/inf materials with nanorod and octahedron structures are also obtained from β-MnOinf2/inf nanorod precursor at temperatures of 700 °C and 900 °C, respectively. The galvanostatic charge-discharge result shows that the polyhedron sphere-like LiMninf2/infOinf4/inf sample exhibits the best electrochemical performance at high rate and high temperature. After 100 cycles at 5 C, this electrode is able to maintain 94% of its capacity at 25 °C and 81% at 55 °C. This is attributed to that the polyhedron sphere-like spinel LiMninf2/infOinf4/inf can suppress the dissolution of manganese ions. Based on Brunauer Emmett Teller (BET), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), the polyhedron sphere-like LiMninf2/infOinf4/inf sample has the lowest BET surface area, largest diffusion coefficient of Lisup+/sup and least charge transfer resistance. This study provides an insight into the capacity fading of LiMninf2/infOinf4/inf electrodes and the polyhedron structured sphere-like LiMninf2/infOinf4/inf can be a promising material for lithium ion batteries.
Publication date
PublisherElsevier
LanguageEnglish
AffiliationNational Research Council Canada; Energy, Mining and Environment
Peer reviewedYes
NPARC number21275680
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Record identifier5a91d2c3-1450-4d35-a123-78c9a8003d4b
Record created2015-07-14
Record modified2016-05-09
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