Abstract
An environmentally friendly method for the synthesis of LiMnPO4/C anode material for lithium-ion batteries by solvothermal method is introduced. The modification of the morphology of this precursor is altered by changing the ratio of the conditioning solvent (water-ethylene glycol solution) and the order of material addition. Ethylene glycol (EG) exerts a considerable influence on synthesizing LiMnPO4/C flake-like nanocrystal, which benefits the extraction/insertion reaction of lithium ions and improves the electrochemical activity and electrochemical performance of LiMnPO4/C material. When the solvent composition is H2O:EG = 1:3, exhibiting exceptional charge/discharge performance and rate capability, the specific discharge capacities are 155.8, 153.7, 148.8, 141.4, 129.5, and 112.6 mAh g−1 at the 0.1, 0.2, 0.5, 1, 2, and 5 C rates, respectively. When the charge–discharge rate returns to 0.1 C, the LiMnPO4/C material shows a reversible discharge specific capacity of 153.7 mAh g−1. Differential scanning calorimetry (DSC) tests verify that the thermodynamic stability of the prepared LiMnPO4/C(LMP) and commercial LiFePO4 (LFP)materials is better than that of commercial nickel–cobalt-aluminum (NCA) ternary materials. These prepared LiMnPO4/C composites have high electrochemical capacity and cycle stability.
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Acknowledgements
The authors gratefully acknowledge the financial support from Qingyuan Huayuan Institute of Science and Technology Collaborative Innovation Co., Ltd., Qingyuan 511517, the National Natural Science Foundation of China (No. 21776051), the Scientific and Technological Plan of Guangdong (2019B090905007), the Guangzhou University Research Projects (YG2020017), and the China Postdoctoral Science Foundation (2020M682662).
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Yang, W., Qiu, X., Wang, C. et al. Controllable Morphology Tailoring with Solvothermal Method Toward LiMnPO4/C Cathode Materials for Improved Performance and Favorable Thermostability. Acta Metall. Sin. (Engl. Lett.) 35, 790–800 (2022). https://doi.org/10.1007/s40195-021-01331-0
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DOI: https://doi.org/10.1007/s40195-021-01331-0