Capacity-controllable Li-rich cathode materials for lithium-ion batteries

Ye, Delai, Ozawa, Kiyoshi, Wang, Bei, Hulicova-Jurcakova, Denisa, Zou, Jin, Sun, Chenghua and Wang, Lianzhou (2014) Capacity-controllable Li-rich cathode materials for lithium-ion batteries. Nano Energy, 6 92-102. doi:10.1016/j.nanoen.2014.03.013

Author Ye, Delai
Ozawa, Kiyoshi
Wang, Bei
Hulicova-Jurcakova, Denisa
Zou, Jin
Sun, Chenghua
Wang, Lianzhou
Title Capacity-controllable Li-rich cathode materials for lithium-ion batteries
Journal name Nano Energy
ISSN 2211-2855
Publication date 2014-05-01
Sub-type Article (original research)
DOI 10.1016/j.nanoen.2014.03.013
Volume 6
Start page 92
End page 102
Total pages 11
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
In this study, we report a new type of Li-rich layered-spinel materials with a general composition formula of xLi2[Mn0.857Co0.143]O3–(1x)Li[Mn1.714Co0.286]O4 (x=0.95, 0.85, 0.75, and 0.65) for use as cathode materials in Li-ion batteries. These materials exhibit steadily increased specific capacities upon cycling for up to several dozen of cycles, depending on the charge–discharge potential windows. Various characterizations reveal that the specific capacity increase is due to the gradual activation of the initial Li-rich layered phase from the surface of the composite particles. Both experimental and computational results suggest that small amount of Co dopants plays a critical role in the continuous activation process of these materials and the structural evaluation mechanism is also discussed. Based on this unique feature, controllable discharge capacities of these cathode materials can be achieved in a broad range from 30 to 240 mA h g1 by deliberately activating the materials at a potential window of 2–4.8 V.
Keyword Capacity increase
Layered-spinel structures
Li-rich cathode materials
Lithium ion battery
Electrochemical Characteristics
Electrode Materials
Positive Electrode
Oxygen Loss
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

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