Carbon-coated LiFePO4–carbon nanotube electrodes for high-rate Li-ion battery

Huynh, Le Thanh Nguyen; Tran, Thi V.; Nguyen, Hoang; Nguyen, Thanh Thuy; Tran, Van Man; Grag, Akhil; Le, My Loan Phung

doi:10.1007/s10008-018-3934-y

Cited by 30 publications

(7 citation statements)

References 44 publications

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“…Figure 4c shows the linear relationship between peak currents (I p ) and the square root of the scan rate (v 1/2 ). The diffusion coefficient D Li are calculated to be 4.35 × 10 −13 and 2.57 × 10 −13 cm 2 /s for the charge and discharge processes, respectively, which are comparable to the previous reported literature [43,44,45]. This confirms that Li ions show excellent transmission performance, suggesting excellent electrochemical performance of our Li-ion batteries.…”

Section: Resultssupporting

confidence: 88%

“…The peak position shifts and the potential separation between two peaks broadens gradually as the scan rate increases. Previous literature has reported that the diffusion coefficient of lithium ions (D Li ) can be determined from a linear relationship between peak currents (i p ) and the square root of the scan rate (v 1/2 ) based on the Randles–Sevcik equation [41,42,43]: Ip=2.69×105n3/2ACD1/2v1/2 where I p (A) is the current maximum, n is the number of electrons transfer per mole (n = 1), F (C/mol) is the Faraday constant, A (cm 2 ) is the electrode area (1.77 cm 2 ), C (mol/cm 3 ) is the lithium concentration in the LiFePO 4 /C composite, v (V/s) is the scanning rate, D Li (cm 2 /s) is the lithium diffusion coefficient, R (J/K·mol) is the gas constant, and T (K) is the temperature. Figure 4c shows the linear relationship between peak currents (I p ) and the square root of the scan rate (v 1/2 ).…”

Section: Resultsmentioning

confidence: 99%

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Preparation of LiFePO4/C Cathode Materials via a Green Synthesis Route for Lithium-Ion Battery Applications

Liu

Chen

et al. 2018

Materials

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In this work, LiFePO4/C composite were synthesized via a green route by using Iron (III) oxide (Fe2O3) nanoparticles, Lithium carbonate (Li2CO3), glucose powder and phosphoric acid (H3PO4) solution as raw materials. The reaction principles for the synthesis of LiFePO4/C composite were analyzed, suggesting that almost no wastewater and air polluted gases are discharged into the environment. The morphological, structural and compositional properties of the LiFePO4/C composite were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), Raman and X-ray photoelectron spectroscopy (XPS) spectra coupled with thermogravimetry/Differential scanning calorimetry (TG/DSC) thermal analysis in detail. Lithium-ion batteries using such LiFePO4/C composite as cathode materials, where the loading level is 2.2 mg/cm2, exhibited excellent electrochemical performances, with a discharge capability of 161 mA h/g at 0.1 C, 119 mA h/g at 10 C and 93 mA h/g at 20 C, and a cycling stability with 98.0% capacity retention at 1 C after 100 cycles and 95.1% at 5 C after 200 cycles. These results provide a valuable approach to reduce the manufacturing costs of LiFePO4/C cathode materials due to the reduced process for the polluted exhaust purification and wastewater treatment.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Preparation of LiFePO4/C Cathode Materials via a Green Synthesis Route for Lithium-Ion Battery Applications

Liu

Chen

et al. 2018

Materials

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“…The performance at high rate would be further improved by forming the composite electrodes between active material and high-conductive carbonaceous-like CNTs or graphene. Our recent report showed that the additional CNTs in LFP's electrodes could benefit the long-term performance upon 200 cycles with 200 mAh/g at rate C/10 and a remarkable capacity of 120 mAh/g at rate 10C [35]. Figure 8(b) compares the rate capability performance of olivine samples; the current densities were applied from C/10 (17 mA/g) to 5C (850 mA/g) after performing 20 cycles at C/10 to activate the electrode's surface.…”

Section: Journal Of Nanomaterialsmentioning

confidence: 99%

Electrode Composite LiFePO₄@Carbon: Structure and Electrochemical Performances

Huynh

Nguyen

Tran

et al. 2019

Journal of Nanomaterials

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This work aimed at preparing the electrode composite LiFePO4@carbon by hydrothermal and the calcination process was conducted at 600, 700, and 800°C. The structure and morphology were determined by X-ray diffraction (XRD), SEM, Raman spectroscopy, X-ray photon spectroscopy (XPS), and thermal analysis. The XRD refinement’s results point out the orthorhombic structure without impurity phase and the high crystalline of synthesized olivines. The results of Raman spectroscopy and XPS confirmed the pure olivine phase as well as the successful carbon coating on the surface of olivines’ powders. Moreover, the calcinated temperature affected the morphology as well as the electrochemical performance of synthesized olivines. The electrochemical measurements were conducted by cyclic voltammetry and galvanostatic cycling test. The diffusion coefficients were calculated from cyclic voltammetry curves and reached 1.09 × 10−12 cm2/s for LFP600, 2.28 × 10−11 cm2/s for LFP700, and 3.27 × 10−12 cm2/s LFP800. The cycling test at rate C/10 exhibited an excellent cyclability with discharge capacity of 145 mAh/g for LFP600, 170 mAh/g for LFP700, and 160 mAh/g for LFP800.

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“…e TEM images were coherent to SEM images. e Raman spectra of two Mn-doped olivines in Figure 5 show two fingerprint signals of carbon in the high-frequency region at 1385 cm − 1 (D-band) and 1583 cm − 1 (G-band) that confirm the composites between Mn-doped olivine and carbon LiMn x Fe 1− x PO 4 @C [14][15][16][17].…”

Section: Structure and Morphologymentioning

confidence: 78%

Structure and Electrochemical Behavior of Minor Mn-Doped Olivine LiMn_xFe_1−xPO₄

Huynh

Trinh

et al. 2019

Journal of Chemistry

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In the recent years, olivine LiFePO4 has been considered as a prospective cathode material for lithium-ion batteries. However, low conductivity is an obstacle to the commercialization of LiFePO4; doping the transition metal such as Mn and Ni is one of the solutions for this issue. This work aimed to synthesize the Mn-doped olivines LiMnxFe1−xPO4 at low content of Mn (x = 0.1, 0.2) via the hydrothermal route followed by pyrolyzed carbon coating. The synthesized olivines were well crystallized in olivine structure, with larger lattice parameters compared with LiFePO4. The EXD and TGA results confirmed the coated carbon of 4.14% for LiMn0.1Fe0.9PO4 and 6.86% for LiMn0.2Fe0.8PO4. Both of Mn-doped olivines showed higher diffusion coefficients of Li+ intercalation than those of LiFePO4 that led a good performance in the cycling test. LiMn0.2Fe0.8PO4 exhibited a higher specific capacity (160 mAh/g) than LiMn0.1Fe0.9PO4 (155 mAh/g), and the Mn content is beneficial for the cycling performance as well as ionic conductivity.

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Carbon-coated LiFePO4–carbon nanotube electrodes for high-rate Li-ion battery

Cited by 30 publications

References 44 publications

Preparation of LiFePO4/C Cathode Materials via a Green Synthesis Route for Lithium-Ion Battery Applications

Preparation of LiFePO4/C Cathode Materials via a Green Synthesis Route for Lithium-Ion Battery Applications

Electrode Composite LiFePO₄@Carbon: Structure and Electrochemical Performances

Structure and Electrochemical Behavior of Minor Mn-Doped Olivine LiMn_xFe_1−xPO₄

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Carbon-coated LiFePO4–carbon nanotube electrodes for high-rate Li-ion battery

Cited by 30 publications

References 44 publications

Preparation of LiFePO4/C Cathode Materials via a Green Synthesis Route for Lithium-Ion Battery Applications

Preparation of LiFePO4/C Cathode Materials via a Green Synthesis Route for Lithium-Ion Battery Applications

Electrode Composite LiFePO4@Carbon: Structure and Electrochemical Performances

Structure and Electrochemical Behavior of Minor Mn-Doped Olivine LiMnxFe1−xPO4

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Product

Resources

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Electrode Composite LiFePO₄@Carbon: Structure and Electrochemical Performances

Structure and Electrochemical Behavior of Minor Mn-Doped Olivine LiMn_xFe_1−xPO₄