Synthesis of carbon-coated LiMn0.8Fe0.2PO4 materials via an aqueous rheological phase-assisted solid-state method

Li, Yuanchao; Xu, Guangri; Fan, Shumin; Ma, Jingjing; Shi, Xiaohui; Long, Zaixin; Deng, Wenjie; Fan, Wenxiu; Yang, Shuting

doi:10.1007/s10008-020-04525-1

Cited by 16 publications

(3 citation statements)

References 45 publications

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“…[51][52][53][54][55] Analysis of these two parameters allows for better characterization of the kinetic properties of the electrochemical reaction. 56,57 The charge transfer impedance reflects the reaction rate at the electrode surface, and a small charge transfer impedance usually implies a high electronic conductivity. 58 The charge transfer impedances for the four samples are 188.6, 123.2, 78.0, and 105.9 Ω, respectively.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…A total of 5.1 g of LiOH•H2O dissolves in 80 mL ethylene glycol, labelled as solution B. Then, adding 5.96 g of H3PO4 to solution B formed the mixed solution C. Gradually, solution C was added into solution A by stirring for 30 min, and then it was transferred Herein, we have developed an innovative freeze-drying-assisted method to enhance the particle size and morphology of LMFP [32,[39][40][41]. By precisely controlling the crystal growth process, our results demonstrate successful spherification of particles with reduced surface area and minimized gaps between smaller particles.…”

Section: Materials and Synthesismentioning

confidence: 99%

“…The extent of the singlephase region is contingent upon the Fe/(Fe+Mn) ratio, with the broadest extent of solid solution observed when the ions of Fe substitution reach 15-30 mol% [20,28]. Although LiMn 1−y Fe y PO 4 possesses the above-mentioned advantages, it still has some unsolved issues including particle size control, low compaction density, electron conductivity, ionic diffusion, and carbon coating technology [29][30][31][32] (Figure 1a,c). The low tap density limits its application in power batteries.…”

Section: Introductionmentioning

confidence: 99%

Freeze-Drying-Assisted Preparation of High-Compaction-Density LiMn0.69Co0.01Fe0.3PO4 Cathode Materials with High-Capacity and Long Life-Cycle for Lithium Ion Batteries

Liu,

Zheng,

Huang

et al. 2024

Batteries

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As a successor to LiFePO4, the research interest in LiMn1−yFeyPO4 has been sustained due to its higher working voltage and safety features. However, its further application is limited by the low compaction density caused by uncontrolled particle size. In this study, the high-quality LiMn0.69Co0.01Fe0.3PO4 (LMFP) materials were prepared using the freeze-drying method to process the LMFP precursor synthesized through a solvothermal crystallization method followed by a calcination process at different temperatures (400–550 °C). The results demonstrate that the obtained particles exhibit a spheroidal shape with a low specific surface area after secondary crystallization calcination at 700 °C. The compaction density increased from 1.96 g/cm3 for LMFP precursor (LMFP-M1) to 2.18, 2.27, 2.34, and 2.43 g/cm3 for samples calcined at 400, 450, 500 and 550 °C, respectively, achieving a maximum increase of 24%. The full cell constructed with the high-compaction-density material calcined at 500 °C displayed discharge capacities of 144.1, 143.8, and 142.6 mAh/g at 0.5, 1, and 3 C rates, respectively, with a retention rate of 99% at 3 C rate. After undergoing charging and discharging cycles at a rate of 1 C for up to 800 cycles, the capacity retention rate was found to be 90%, indicating an expected full cell life span exceeding 2500 cycles.

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Synthesis and characterization of LiMn0.8Fe0.2PO4/rGO/C for lithium-ion batteries via in-situ coating of Mn0.8Fe0.2C2O4·2H2O precursor with graphene oxide

Wang

et al. 2020

J Solid State Electrochem

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Synthesis of carbon-coated LiMn0.8Fe0.2PO4 materials via an aqueous rheological phase-assisted solid-state method

Cited by 16 publications

References 45 publications

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

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

Freeze-Drying-Assisted Preparation of High-Compaction-Density LiMn0.69Co0.01Fe0.3PO4 Cathode Materials with High-Capacity and Long Life-Cycle for Lithium Ion Batteries

Synthesis and characterization of LiMn0.8Fe0.2PO4/rGO/C for lithium-ion batteries via in-situ coating of Mn0.8Fe0.2C2O4·2H2O precursor with graphene oxide

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Synthesis of carbon-coated LiMn0.8Fe0.2PO4 materials via an aqueous rheological phase-assisted solid-state method

Cited by 16 publications

References 45 publications

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

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

Freeze-Drying-Assisted Preparation of High-Compaction-Density LiMn0.69Co0.01Fe0.3PO4 Cathode Materials with High-Capacity and Long Life-Cycle for Lithium Ion Batteries

Synthesis and characterization of LiMn0.8Fe0.2PO4/rGO/C for lithium-ion batteries via in-situ coating of Mn0.8Fe0.2C2O4·2H2O precursor with graphene oxide

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

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