Simultaneously improved capacity and initial coulombic efficiency of Li-rich cathode Li[Li0.2Mn0.54Co0.13Ni0.13]O2 by enlarging crystal cell from a nanoplate precursor

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DOIResolve DOI: http://doi.org/10.1016/j.jpowsour.2016.01.046
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TypeArticle
Journal titleJournal of Power Sources
ISSN0378-7753
Volume307
Pages665672; # of pages: 8
SubjectCathodes; Cells; Cytology; Electric batteries; Electrodes; Ions; Lithium compounds; Lithium-ion batteries; Manganese; Manganese oxide; Nanostructures; Nickel; Rietveld analysis; Rietveld refinement; Cath-ode materials; Crystal cell parameters; Discharge capacities; High energy densities; Initial Coulombic efficiency; Irreversible capacity loss; Nano-Plate; Specific capacities; Lithium
AbstractLi-rich manganese layered oxide is one of the most promising cathode materials that meet the requirements for high-energy-density Li-ion batteries. However, a large irreversible capacity loss at the first cycle makes it difficult to be an applicable cathode material. Although wide investigations have been carried out to overcome such defect, researchers are still beset by the problems of how to concurrently improve the multiple performances of the cathode. In this work, Li[Li0.2Mn0.54Co0.13Ni0.13]O2 is synthesized, which delivers both improved high-energy capacity of 308 mAh g-1 and enhanced initial coulombic efficiency of 85%. The corresponding values of a contrast sample are only 245 mAh g-1 and 77%, respectively. Based on the data of bond distances, crystal cell parameters, and the calculated electron cloud density revealed by Rietveld analysis, an enlarged crystal cell mechanism is proposed. The improved performances are originated from the enlarged crystal cell, which facilitates the Li+ delithiation/lithiation from the octahedral and tetrahedral sites, accordingly increasing the discharge capacity and initial coulombic efficiency. The proposed method offers a strategy to simultaneously increase the initial coulombic efficiency and the specific capacity for Li ion batteries.
Publication date
PublisherElsevier
LanguageEnglish
AffiliationNational Research Council Canada; Energy, Mining and Environment
Peer reviewedYes
NPARC number21277464
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Record identifier573575f6-4a68-44af-a587-9ddedc2a4bc1
Record created2016-03-09
Record modified2016-05-09
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