Abstract
Synthesis method is crucial to the improved electrochemical performances of LiMnPO4 materials with poor electronic and ionic conductivity for large-scale preparation. Here, carbon-coated LiMn0.8Fe0.2PO4 materials were synthesized through a rheological phase-assisted solid-state method combined with freeze-drying. Effect of different carbon sources on the structure, morphology, and electrochemical performance of as-prepared LiMn0.8Fe0.2PO4 materials was investigated. The results suggest that LiMn0.8Fe0.2PO4 materials with citric acid as carbon sources show a high discharge capacity with 164, 122, and 106 mA h g−1 at 0.1, 1, and 5 C, and a capacity retention of around 99.6% after 100 cycles at 1 C. This can be attributed to higher surface area, intense peak of sp2 N–C=N bonds, and uniform particle distribution resulting from the rheological phase formed using citric acid as carbon sources combined with freeze-drying. The rheological phase-assisted solid-state method is a promising route for production of LiMn0.8Fe0.2PO4 materials with excellent performances.
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Acknowledgments
We are grateful for financial supports from the Research Foundation for Advanced Talents of Henan Institute of Science and Technology (No. 2016036), Henan Postdoctoral Science Foundation (No. 001802032), the National Natural Science Foundation of China (No. 21703057), Programs for Science and Technology Development of Henan Province of China (No. 192102210016), and Key Scientific Research Project of Colleges and Universities of Henan Province (No. 19A150007).
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Li, Y., Xu, G., Fan, S. et al. Synthesis of carbon-coated LiMn0.8Fe0.2PO4 materials via an aqueous rheological phase-assisted solid-state method. J Solid State Electrochem 24, 821–828 (2020). https://doi.org/10.1007/s10008-020-04525-1
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DOI: https://doi.org/10.1007/s10008-020-04525-1