Heterogeneous synthesis and electrochemical performance of LiMnPO4/C composites as cathode materials of lithium ion batteries. Issue 66 (2nd November 2020)

• Record Type: Journal Article
• Authors: Zheng, Ju-Gong; Ren, Guang-Yuan; Shi, Jun; Yang, Ting; Tang, Yue-Feng; Chen, Yan-Feng
• Is Part Of: RSC advances. Volume 10:Issue 66(2020)
• Page Start: 39981
• Page End: 39987
• Publication Date: 2020-11-02
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d0ra08274k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A heterogeneous nucleation technique was used to prepare LiMnPO4 /C. The walls of carbon nanotubes were employed as nucleation interfaces and phytic acid as an eco-friendly phosphorus source. The product exhibits superior electrochemical performance. Abstract : In this study, a facile yet efficient interfacial hydrothermal process was successfully developed to fabricate LiMnPO4 /C composites. In this strategy, the walls of carbon nanotubes were employed as heterogeneous nucleation interfaces and biomass of phytic acid (PA) as an eco-friendly phosphorus source. By comparing the experimental results, a reasonable nucleation-growth mechanism was proposed, suggesting the advantages of interfacial effects. Meanwhile, the as-synthesized LiMnPO4 /C samples exhibited superior rate performances with discharge capacities reaching 161 mA h g −1 at C/20, 134 mA h g −1 at 1C, and 100 mA h g −1 at 5C. The composites also displayed excellent cycling stabilities by maintaining 95% of the initial capacity over 100 continuous cycles at 1C. Electrochemical impedance spectroscopy showed that the superior electrochemical performances were attributed to the low charge-transfer resistance and elevated diffusion coefficient of lithium ions. In sum, the proposed approach for the preparation of LiMnPO4 /C composites looks promising for future production of composite electrode materials for high-performance lithium-ion batteries.