Optimal synthetic conditions for a novel and high performance Ni-rich cathode material of LiNi0.68Co0.10Mn0.22O2
Layered Ni-rich oxides (LiNixCoyMnzO2) 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)...
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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 |
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London
Royal Society of Chemistry
01.08.2018
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Abstract | Layered Ni-rich oxides (LiNixCoyMnzO2) 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 Ni2+ (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 LiNi0.68Co0.10Mn0.22O2 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 LiNi0.68Co0.10Mn0.22O2 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 LiNi0.68Co0.10Mn0.22O2 is a promising cathode material for high energy density lithium ion batteries. |
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AbstractList | Layered Ni-rich oxides (LiNixCoyMnzO2) 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 Ni2+ (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 LiNi0.68Co0.10Mn0.22O2 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 LiNi0.68Co0.10Mn0.22O2 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 LiNi0.68Co0.10Mn0.22O2 is a promising cathode material for high energy density lithium ion batteries. |
Author | Jiang, Fei Li, Xing Wang, Mingshan Zheng, Jianming Zhang, Kangjia Liu, Yang Huang, Yun Wang, Siyuan |
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SubjectTerms | Batteries Cathodes Cations Cobalt Discharge Discharge capacity Electrochemical analysis Electrochemistry Electrode materials Flux density Interface stability Lithium Lithium-ion batteries Morphology Oxides Rechargeable batteries Sintering Structural stability Temperature |
Title | Optimal synthetic conditions for a novel and high performance Ni-rich cathode material of LiNi0.68Co0.10Mn0.22O2 |
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