| Autor: |
Khan, Sourav, Raj, Rayappan Pavul, George, Laurel, Kannangara, G. S. Kamali, Milev, Adriyan, Varadaraju, Upadhyayula V., Selvam, Parasuraman |
| Předmět: |
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| Zdroj: |
ChemistryOpen; Jan2020, Vol. 9 Issue 1, p23-31, 9p |
| Abstrakt: |
The synthesis of morphology-controlled carbon-coated nanostructured LiFePO4 (LFP/Carbon) cathode materials by surfactant-assisted hydrothermal method using block copolymers is reported. The resulting nanocrystalline high surface area materials were coated with carbon and designated as LFP/C123 and LFP/C311. All the materials were systematically characterized by various analytical, spectroscopic and imaging techniques. The reverse structure of the surfactant Pluronic® 31R1 (PPO-PEO-PPO) in comparison to Pluronic® P123 (PEO-PPO-PEO) played a vital role in controlling the particle size and morphology which in turn ameliorate the electrochemical performance in terms of reversible specific capacity (163 mAhg-1 and 140 mAhg-1 at 0.1 C for LFP/C311 and LFP/C123, respectively). In addition, LFP/C311 demonstrated excellent electrochemical performance including lower charge transfer resistance (146.3 Ω) and excellent cycling stability (95% capacity retention at 1 C after 100 cycles) and high rate capability (163.2 mAhg-1 at 0.1 C; 147.1 mAhg-1 at 1 C). The better performance of the former is attributed to LFP nanoparticles (<50 nm) with a specific spindle-shaped morphology. Further, we have also evaluated the electrode performance with the use of both PVDF and CMC binders employed for the electrode fabrication. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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