Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542
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Electrochemical Performance of Nanorod-like (La, Zr) Co-Doped Li-rich Li1.2Ni0.2Mn0.6O2 Cathodes for Use in Lithium-Ion Batteries
Wencong WANGHiromasa HANZAWAKen-ichi MACHIDAKohei MIYAZAKITakeshi ABE
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2022 年 90 巻 1 号 p. 017008

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A lithium-rich layered structure in lithium-ion batteries (LIBs) has attracted much attention due to its high capacity of over 250 mAh g−1 after activation. This could satisfy the requirements of next-generation energy-storage devices. However, a spinel-like impurity phase that forms from the pristine layered structure during cycling is considered to be harmful to the structure stability and Li+ mobility, resulting in undesired electrochemical performance. In this study, nanorod-like Li1.2Ni0.2Mn0.6O2 with a three-dimensional architecture was synthesized by evaporative-crystallization with as-prepared nano-MnO2 as a hard template. The structure stability and Li+ mobility of the nanorod-like Li1.2Ni0.2Mn0.6O2 was improved by the addition of an appropriate molar ratios of (La, Zr) co-dopants. This combination exhibited outstanding capacity retention of 80.9 % with a stable discharge capacity of 102 mAh g−1 after 300 cycles under a high current density of 1000 mA g−1 (corresponding to 5 C). This study suggests that the use of a multi-prong strategy that combines morphology control and co-doping should be an effective method for improving the high-rate performance of Li-rich materials.

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© The Author(s) 2021. Published by ECSJ.

This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium provided the original work is properly cited. [DOI: 10.5796/electrochemistry.21-00115].
http://creativecommons.org/licenses/by/4.0/
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