Contribution of calcium ion doping to the rate property for LiFe0.5Mn0.5PO4/C

Liu, Weifang; Liu, Xichang; Hao, Rui; Yang, Zhihao; Ouyang, Baixue; Zhang, Mengjie; Pan, Mengwei; Liu, Kaiyu

doi:10.1016/j.jelechem.2022.117117

Cited by 19 publications

(9 citation statements)

References 33 publications

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“…Moreover, in LFMP/C-3%Ti, there was a slight shift in the positions of the Fe 2p 3/2 and Mn 2p 3/2 peaks compared to LFMP/C-0%Ti, suggesting an alteration in the charge distribution of Fe and Mn due to Ti-doping. 29 Figure 3e illustrates the deconvoluted O 1s spectral peaks, confirming the simultaneous presence of various bonds: C−O, C�O, P−O, and M−O (M = Fe, Mn, and Ti), with their corresponding binding energies situated at 533.24, 531.77, 531.55, and 530.51 eV, respectively. 50,51 Figure 4a presents the CV curves of the Li-(Fe 0.6 Mn 0.4 ) 1−x Ti x PO 4 /C samples.…”

Section: Resultsmentioning

confidence: 64%

“…Although these measures have been employed, they have not been effective in enhancing the intrinsic electronic and ionic conductivity of LFMP material. , Consequently, doping modification has become a focal point of research. This includes doping with aluminum, magnesium, , and sodium , at the lithium site, and nickel, , cobalt, , magnesium, , calcium, yttrium, , chromium, , vanadium, , and niobium , at the transition metal site. Hu et al successfully introduced Mg 2+ into the Li + site of the LFMP using a solvent-thermal method, producing various magnesium-doped LFMP/C compositions.…”

Section: Introductionmentioning

confidence: 99%

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Contribution of Ti-Doping to the Cyclic Stability of LiFe_0.6Mn_0.4PO₄/C

Peng,

Li,

You

et al. 2024

Ind. Eng. Chem. Res.

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Li(Fe 0.6 Mn 0.4 ) 1−x Ti x PO 4 /C cathode materials, with x values of 0, 0.01, 0.02, 0.03, and 0.04, were fabricated through a dual-stage synthesis process, incorporating both coprecipitation and high-temperature solid-phase techniques. The composition, microstructure, and surface morphology of these materials were thoroughly characterized using a suite of analytical techniques. These analyses confirmed the successful doping of Ti ions into the olivine lattice, resulting in a decrease in unit cell volume and the formation of an amorphous carbon layer on the particles' surfaces, which also improved particle dispersion. The electrochemical performance of the Li(Fe 0.6 Mn 0.4 ) 1−x Ti x PO 4 /C samples was assessed using techniques including constant current charge−discharge testing, cyclic voltammetry, and electrochemical impedance spectroscopy. The findings showed that Ti-doping markedly diminishes potential polarization in these materials and the strong Ti−O coordination suppresses the Jahn−Teller effect of Mn 3+ , effectively enhancing the stability and lithium-ion diffusion rate of the material. Additionally, density functional theory (DFT) calculations were conducted to assess the impact of Ti-doping on LFMP. The findings reveal that Ti-doping reduces the bandgap of the material and increases the bond length of Li−O, thereby further confirming that Ti-doping can enhance electronic conductivity. Among them, the Li(Fe 0.6 Mn 0.4 ) 1−x Ti x PO 4 /C-3%Ti cathode material exhibited the best electrochemical performance. The optimized sample demonstrated a specific discharge capacity of 163.53 mAh•g −1 at 0.1C, accompanied by an initial coulombic efficiency of 93.18%. At 1C, it provided a capacity of 140.59 mAh•g −1 , sustaining a capacity retention of 93.58% after 500 cycles, and delivered a discharge capacity of 94.08 mAh•g −1 at 5C.

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Section: Resultsmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Contribution of Ti-Doping to the Cyclic Stability of LiFe_0.6Mn_0.4PO₄/C

Peng,

Li,

You

et al. 2024

Ind. Eng. Chem. Res.

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“…35 It is well-established that Li 4 Ti 5 O 12 (LTO) material has a spineltype structure with a chemical diffusion coefficient (10 −6 cm 2 s −1 ) significantly higher than that of LMFP (about 10 −18 cm 2 s −1 ). 36,37 z E-mail: liangguangchuan564@163.com This property greatly facilitates the embedding and detachment of lithium ions in redox reactions. In addition, LTO is a zero-strain material, 38 exhibiting no structural changes during electrode reactions and cycling, which contributes to the improved cycling stability of the cathode material.…”

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confidence: 99%

Electrochemical Properties of Li₄Ti₅O₁₂ Coated LiMn_0.6Fe_0.4PO₄ Prepared by Rheological Phase Reaction Method

Gu,

Li,

et al. 2024

J. Electrochem. Soc.

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In this study, we fabricated LiMn0.6Fe0.4PO4/C (LMFP/C) materials employing the spray drying method. Subsequently, the LMFP/C composites underwent surface modification with Li4Ti5O12 (LTO) using the rheological phase reaction method. LTO demonstrates high electrochemical activity and possesses significantly greater lithium-ion conductivity compared to LMFP. The developed composite coating serves a dual purpose by safeguarding the LMFP material against electrolyte erosion and facilitating the swift transfer of lithium ions and electrons. The results from transmission electron microscopy and energy-dispersive X-ray spectroscopy validated the successful coating of LTO onto the LMFP/C surface after the surface modification treatment. A comparative analysis was conducted between the pristine LMFP/C powder and the LMFP-LTO composite that underwent surface modification. The results reveal that the 2 wt. % LTO-coated LMFP/C composite has the best electrochemical performance, manifesting specific capacities of 156 and 132.6 mAh·g-1 at 0.2 and 5 C rate, respectively. Furthermore, the material demonstrated excellent cycle retention, with 95.4% capacity retention after 100 cycles at 1 C. Hence, LTO coating can be considered an efficacious strategy for enhancing the electrochemical performance of LMFP.

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“…The Ca 2+ doping leads to an increase in the lattice distance of LFMP and thus mitigates the Jahn–Teller distortion, improving the ionic diffusion coefficient and discharge rate behaviors (∼105.7 mA h g −1 at 10C). 23 Duan et al have used a mechano-chemical liquid-phase activation method to prepare Mg doped LFMP, which delivers a remarkable discharge capacity of 156 mA h g −1 (at 0.05C) for Li(Mn 0.9 Fe 0.1 ) 0.95 Mg 0.05 PO 4 and an impressive retention ratio after 100 cycles. 24 In addition to cation doping techniques, anion doping techniques have also been proposed.…”

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confidence: 99%

Achieving long-lasting and high-capacity LiFe_0.5Mn_0.5PO₄ cathodes with a synergistic F/In dual doping strategy

Li,

Zhu,

et al. 2024

New J. Chem.

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Contribution of calcium ion doping to the rate property for LiFe0.5Mn0.5PO4/C

Cited by 19 publications

References 33 publications

Contribution of Ti-Doping to the Cyclic Stability of LiFe_0.6Mn_0.4PO₄/C

Contribution of Ti-Doping to the Cyclic Stability of LiFe_0.6Mn_0.4PO₄/C

Electrochemical Properties of Li₄Ti₅O₁₂ Coated LiMn_0.6Fe_0.4PO₄ Prepared by Rheological Phase Reaction Method

Achieving long-lasting and high-capacity LiFe_0.5Mn_0.5PO₄ cathodes with a synergistic F/In dual doping strategy

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Contribution of calcium ion doping to the rate property for LiFe0.5Mn0.5PO4/C

Cited by 19 publications

References 33 publications

Contribution of Ti-Doping to the Cyclic Stability of LiFe0.6Mn0.4PO4/C

Contribution of Ti-Doping to the Cyclic Stability of LiFe0.6Mn0.4PO4/C

Electrochemical Properties of Li4Ti5O12 Coated LiMn0.6Fe0.4PO4 Prepared by Rheological Phase Reaction Method

Achieving long-lasting and high-capacity LiFe0.5Mn0.5PO4 cathodes with a synergistic F/In dual doping strategy

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Contribution of Ti-Doping to the Cyclic Stability of LiFe_0.6Mn_0.4PO₄/C

Contribution of Ti-Doping to the Cyclic Stability of LiFe_0.6Mn_0.4PO₄/C

Electrochemical Properties of Li₄Ti₅O₁₂ Coated LiMn_0.6Fe_0.4PO₄ Prepared by Rheological Phase Reaction Method

Achieving long-lasting and high-capacity LiFe_0.5Mn_0.5PO₄ cathodes with a synergistic F/In dual doping strategy