Cathode Material with Nanorod Structure-An Application for Advanced High-Energy and Safe Lithium Batteries

Title
Cathode Material with Nanorod Structure-An Application for Advanced High-Energy and Safe Lithium Batteries
Author
선양국
Keywords
coprecipitation; nanorod; concentration gradient; cathode; lithium batteries
Issue Date
2013-05
Publisher
AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Citation
Chemistry of Materials, Vol.25, No.10, 2109p ~ 2115p
Abstract
We have developed a novel cathode material based on lithium-nickel-manganese-cobalt oxide, where the manganese concentration remains constant throughout the particle, while the nickel concentration decreases linearly and the cobalt concentration increases from the center to the outer surface of the particle. This full concentration gradient material with a fixed manganese composition (FCG-Mn-F) has an average composition of Li[Ni0.60Co0.15Mn0.25]O-2 and is composed of rod-shaped primary particles whose length reaches 2.5 mu m, growing in the radial direction. In cell tests, the FCG-Mn-F material delivered a high capacity of 206 mAh g(-1) with excellent capacity retention of 70.3% after 1000 cycles at 55 degrees C. This cathode material also exhibited outstanding rate capability, good low-temperature performance, and excellent safety, compared to a conventional cathode having the same composition (Li[Ni0.60Co0.15Mn0.25]O-2), where the concentration of the metals is constant across the particles.
URI
http://pubs.acs.org/doi/pdf/10.1021/cm4006772http://hdl.handle.net/20.500.11754/44615
ISSN
0897-4756
DOI
10.1021/cm4006772
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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