Optimal synthetic conditions for a novel and high performance Ni-rich cathode material of LiNi 0.68 Co 0.10 Mn 0.22 O 2
Layered Ni-rich oxides (LiNi x Co y Mn z O 2 ) are considered as the most promising cathode materials for lithium ion batteries because of their high discharge capacity, high Li + ion deintercalation/intercalation potential, and low cobalt content. However, because of the similar ionic radius of Li...
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Published in | Sustainable energy & fuels Vol. 2; no. 8; pp. 1772 - 1780 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
2018
|
Online Access | Get full text |
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Summary: | Layered Ni-rich oxides (LiNi
x
Co
y
Mn
z
O
2
) are considered as the most promising cathode materials for lithium ion batteries because of their high discharge capacity, high Li
+
ion deintercalation/intercalation potential, and low cobalt content. However, because of the similar ionic radius of Li
+
(0.76 Å) and Ni
2+
(0.69 Å), the Ni-rich cathodes often suffer from poor cycling stability because of the serious cation mixing, and the poor interfacial/structural stability during the electrochemical process. In this work, the effects of sintering temperature, sintering time and excess lithium amount on the structure, morphology and electrochemical performance of a novel spherical high Ni-rich cathode material LiNi
0.68
Co
0.10
Mn
0.22
O
2
cathode are systematically investigated. The results indicate that a sintering temperature of 780 °C with a sintering time of 16 h and an excess lithium amount of 5 wt% could achieve a more stable and lower cation mixing degree LiNi
0.68
Co
0.10
Mn
0.22
O
2
cathode. It delivers a reversible discharge capacity as high as 197.4 mA h g
−1
at C/10, and exhibits a capacity retention of 95.9%, 90.2% and 83.5% at C/3, 1C and 3C after 200 cycles at cut-off voltages of 2.7–4.4 V, respectively. These results demonstrate that the optimized LiNi
0.68
Co
0.10
Mn
0.22
O
2
is a promising cathode material for high energy density lithium ion batteries. |
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ISSN: | 2398-4902 2398-4902 |
DOI: | 10.1039/C8SE00192H |