A New High Power LiNi sub(0.81)Co sub(0.1)Al sub(0.09)O sub(2) Cathode Material for Lithium-Ion Batteries

Among the various Ni-based layered oxide systems in the form of LiNi sub(1-y-z)Co sub(y)Al sub(z)O sub(2) (NCA), the compostions between y = 0.1-0.15, z = 0.05 are the most successful and commercialized cathodes used in electric vehicles (EVs) and hybrid electric vehicles (HEVs). However, tremendous...

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Bibliographic Details
Published in:Advanced energy materials 2014-09, Vol.4 (13), p.np-np
Main Authors: Jo, Minki, Noh, Mijung, Oh, Pilgun, Kim, Youngsik, Cho, Jaephil
Format: Article
Language:English
Subjects:
Cathodes
Charge
Electric potential
Electric vehicles
Lithium-ion batteries
Reduction
Searching
Thermal stability
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Summary:Among the various Ni-based layered oxide systems in the form of LiNi sub(1-y-z)Co sub(y)Al sub(z)O sub(2) (NCA), the compostions between y = 0.1-0.15, z = 0.05 are the most successful and commercialized cathodes used in electric vehicles (EVs) and hybrid electric vehicles (HEVs). However, tremendous research effort has been dedicted to searching for better composition in NCA systems to overcome the limitations of these cathodes, particularly those that arise when they are used use at high discharge/charge rates (>5C) and in high temperature (60 degree C) environments. In addition, improving the thermal stability at 4.5 V is also very important in terms of the total amount of heat generated and the onset temperature. Here, a new NCA composition in the form of LiNi sub(0.81)Co sub(0.1)Al sub(0.09)O sub(2) (y = 0.1, z = 0.09) is reported for the first time. Compared to the LiNi sub(0.85)Co sub(0.1)Al sub(0.05)O sub(2) cathode, LiNi sub(0.81)Co sub(0.1)Al sub(0.09)O sub(2) exhibits an excellent rate capability of 155 mAh g super(-1) at 10 C with a cut-off voltage range between 3 and 4.5 V, corresponding to 562 Wh kg super(-1) at 24 degree C. It additionally provides significantly improved thermal stability and electrochemical performance at the high temperature of 60 degree C, with a discharge capacity of 122 mAh g super(-1) after 200 cycles with capacity retention of 59%. A new LiNi sub(0.81)Co sub(0.1)Al sub(0.09)O sub(2) cathode exhibits a remarkably improved rate capability, showing a capacity of 155 mAh g super(-1), even at a 10C rate and cycling stability at 60 degree C. More importantly, this material has dramatically improved thermal stability caused by the reduction in heat generation compared to LiNi sub(0.89)Co sub(0.11)O sub(2).
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.201301583