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Structural and Electrochemical Kinetic Properties of 0.5Li₂MnO₃?0.5LiCoO₂ Cathode Materials with Different Li₂MnO₃ Domain Sizes.

ABSTRACT: Lithium rich layered oxide xLi₂MnO₃?(1-x)LiMO₂ (M?=?Mn, Co, Ni, etc.) materials are promising cathode materials for next generation lithium ion batteries. However, the understanding of their electrochemical kinetic behaviors is limited. In this work, the phase separation behaviors and electrochemical kinetics of 0.5Li₂MnO₃?0.5LiCoO₂ materials with various Li₂MnO₃ domain sizes were studied. Despite having similar morphological, crystal and local atomic structures, materials with various Li₂MnO₃ domain sizes exhibited different phase separation behavior resulting in disparate lithium ion transport kinetics. For the first few cycles, the 0.5Li₂MnO₃?0.5LiCoO₂ material with a small Li₂MnO₃ domain size had higher lithium ion diffusion coefficients due to shorter diffusion path lengths. However, after extended cycles, the 0.5Li₂MnO₃?0.5LiCoO₂ material with larger Li₂MnO₃ domain size showed higher lithium ion diffusion coefficients, since the larger Li₂MnO₃ domain size could retard structural transitions. This leads to fewer structural rearrangements, reduced structural disorders and defects, which allows better lithium ion mobility in the material.

SUBMITTER: Kaewmala S

PROVIDER: S-EPMC6344595 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature

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Structural and Electrochemical Kinetic Properties of 0.5Li2MnO3∙0.5LiCoO2 Cathode Materials with Different Li2MnO3 Domain Sizes.

Kaewmala Songyoot S Limphirat Wanwisa W Yordsri Visittapong V Kim Hyunwoo H Muhammad Shoaib S Yoon Won-Sub WS Srilomsak Sutham S Limthongkul Pimpa P Meethong Nonglak N

Scientific reports 20190123 1

Lithium rich layered oxide xLi2MnO3∙(1-x)LiMO2 (M = Mn, Co, Ni, etc.) materials are promising cathode materials for next generation lithium ion batteries. However, the understanding of their electrochemical kinetic behaviors is limited. In this work, the phase separation behaviors and electrochemical kinetics of 0.5Li2MnO3∙0.5LiCoO2 materials with various Li2MnO3 domain sizes were studied. Despite having simi ...[more]

PMID: 30674922

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Project description:Anionic redox reactions attributed to oxygen have attracted much attention as a new approach to overcoming the energy-density limits of cathode materials. Several oxides have been suggested as new cathode materials with high capacities based on anionic (oxygen) redox reactions. Although most still have a large portion of their capacity based on the cationic redox reaction, lithia-based cathodes present high capacities that are purely dependent upon oxygen redox. Contrary to Li-air batteries, other systems using pure oxygen redox reactions, lithia-based cathodes charge and discharge without a phase transition between gas and condensed forms. This leads to a more stable cyclic performance and lower overpotential compared with those of Li-air systems. However, to activate nanolithia and stabilize reaction products such as Li2O2 during cycling, lithia-based cathodes demand efficient catalysts (dopants). In this study, Ir based materials (Ir and Li2IrO3) were introduced as catalysts (dopants) for nanolithia composites. Oxide types (Li2IrO3) were used as source materials of catalyst because ductile metal (Ir) can hardly be pulverized during the milling process. Two types of Li2IrO3 were prepared and used for catalyst-sources. They were named '1-step Li2IrO3' and '2-step Li2IrO3', respectively, since they were prepared by '1-step' or '2-step' heat treatment. The nanocomposites prepared using lithia & 2-step Li2IrO3 presented a higher capacity, more stable cyclic performance, and lower overpotential than those of the nanocomposites prepared using lithia & 1-step Li2IrO3. The voltage profiles of the nanocomposites prepared using lithia & 2-step Li2IrO3 were stable up to a limited capacity of 600 mAh·g-1, and the capacity was maintained during 100 cycles. XPS analysis confirmed that the capacity of our lithia-based compounds is attributable to the oxygen redox reaction, whereas the cationic redox related to the Ir barely contributes to their discharge capacity.

Dataset Information

Structural and Electrochemical Kinetic Properties of 0.5Li₂MnO₃?0.5LiCoO₂ Cathode Materials with Different Li₂MnO₃ Domain Sizes.

Publications

Structural and Electrochemical Kinetic Properties of 0.5Li<sub>2</sub>MnO<sub>3</sub>∙0.5LiCoO<sub>2</sub> Cathode Materials with Different Li<sub>2</sub>MnO<sub>3</sub> Domain Sizes.

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Dataset Information

Structural and Electrochemical Kinetic Properties of 0.5Li2MnO3?0.5LiCoO2 Cathode Materials with Different Li2MnO3 Domain Sizes.

Publications

Structural and Electrochemical Kinetic Properties of 0.5Li<sub>2</sub>MnO<sub>3</sub>∙0.5LiCoO<sub>2</sub> Cathode Materials with Different Li<sub>2</sub>MnO<sub>3</sub> Domain Sizes.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets

Structural and Electrochemical Kinetic Properties of 0.5Li₂MnO₃?0.5LiCoO₂ Cathode Materials with Different Li₂MnO₃ Domain Sizes.