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Improved electrochemical performance of spinel LiMnO derived from manganese-based metal-organic frameworks by organic ligands

The spinel LiMn 2 O 4 cathode has received substantial attention from researchers owing to its high voltage plateau, eco-friendliness, and cost-effectiveness. Nevertheless, its practical application has been impeded by severe capacity attenuation due to the Jahn-Teller effect and spontaneous disprop...

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Bibliographic Details
Published in:New journal of chemistry 2023-07, Vol.47 (29), p.1468-1477
Main Authors: Huo, Yong-Lin, Gu, Yi-Jing, Chen, Zi-Liang, Ma, Xiao-Yu, Wu, Fu-Zhong, Dai, Xin-Yi
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Summary:The spinel LiMn 2 O 4 cathode has received substantial attention from researchers owing to its high voltage plateau, eco-friendliness, and cost-effectiveness. Nevertheless, its practical application has been impeded by severe capacity attenuation due to the Jahn-Teller effect and spontaneous disproportionation reaction. To overcome these issues, this study synthesized a series of manganese-based metal-organic frameworks with varying structures using aromatic carboxylic acids that contain different numbers of carboxyl groups as organic frameworks. These frameworks were then used as precursors for synthesizing spinel LiMn 2 O 4 cathode materials. This approach aims to enhance capacity, cycle stability, and rate performance by reducing the diffusion resistance of lithium ions, exposing the (111) plane, and increasing the Mn 3+ content. The LMO-PMA sample exhibited remarkable cycling stability (91.4% after 1000 cycles at 10C) and superior capacity (140.2 mA h g −1 at 0.2C, 113.1 mA h g −1 at 10C). This approach can be extended to the synthesis of other cathode materials. The spinel LiMn 2 O 4 cathode has received substantial attention from researchers owing to its high voltage plateau, eco-friendliness, and cost-effectiveness.
ISSN:1144-0546
1369-9261
DOI:10.1039/d3nj01576a