Yolk-shelled cathode materials with extremely high electrochemical performances prepared by spray pyrolysis

Seung Ho Choi, Young Jun Hong, Yun Chan Kang

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

A facile, continuous preparation process of yolk-shell-structured lithium-metal oxide powders without a template for use as cathode materials in lithium ion batteries is introduced for the first time. Single and double-shelled LiNi0.5Mn1.5O4 yolk-shell powders as the first target materials are prepared directly by spray pyrolysis from a spray solution with sucrose, at a short residence time of 4 s. Fast combustion and contraction of a carbon-mixed oxide composite intermediate, formed from a micro-sized droplet inside a hot wall reactor maintained at 700°C, produces the yolk-shell powders. The yolk-shell structure of the precursor powders directly prepared by spray pyrolysis is well maintained even at a high post-treatment temperature of 750°C. The yolk-shell LiNi 0.5Mn1.5O4 powders delivered a 1000 th high discharge capacity of 108 mA h g-1 at 10 C. The discharge capacities are as high as 103, 95, and 91 mA h g-1 at extremely high discharge rates of 100, 200, and 300 C and the corresponding specific energy densities are 420, 370, and 328 W h kg-1. The capacity retention at a constant discharge rate of 200 C is 90% after 500 cycles.

Original languageEnglish
Pages (from-to)7867-7871
Number of pages5
JournalNanoscale
Volume5
Issue number17
DOIs
Publication statusPublished - 2013 Sep 7
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)

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