The prepared and electrochemical property of Mg-doped LiMn0.6Fe0.4PO4/C as cathode materials for lithium-ion batteries

Zhang, Kaicheng; Cao, Jingrui; Tian, Shiyu; Guo, Hongyuan; Liu, Ruoxuan; Ren, Xiaoyong; Liang, Wen; Liang, Guangchuan

doi:10.1007/s11581-021-04183-x

Cited by 20 publications

(10 citation statements)

References 38 publications

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“…σ is the Warburg constant associated with Z'. The value of σ can be calculated by formula (2), which is the slope of a line with a linear relationship between Z' and ω −1/2 . The EIS parameters and diffusion coefficient of lithium ferradenophosphate samples before and after modification were obtained by fitting and calculating.…”

Section: Resultsmentioning

confidence: 99%

“…Lithium iron phosphate itself does not contain precious metals such as cobalt and nickel, so lithium iron phosphate has a great resource advantage. Therefore, it is expected that in the next 10 years, lithium iron phosphate batteries will have a more robust development in new energy vehicles, energy storage, twowheeled vehicles, electric ships and other fields [1,2]. Lithium ferromanganese phosphate and lithium iron phosphate belong to the olivine crystal structure, the theoretical specific capacity is the same 170 mAh/g, but its electrode potential relative to Li + /Li is 4.1V, much higher than lithium iron phosphate 3.4V.…”

Section: Introductionmentioning

confidence: 99%

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Study on the effect of conductive polymer coating on properties of polyanionic materials

He,

Wei,

Zhao

et al. 2024

Ninth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2023)

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In this paper, Lithium iron phosphate materials coated with conductive polymer were prepared by high temperature solid phase method. For the sake of investigating the effect of conductive polymer coating on Lithium iron phosphate materials, scanning electron microscopy (SEM), transmission electro microscopy(TEM), charge and discharge test, rate performance and electrochemical impedance were used to analyze the microstructure and electrochemical of the materials. The results displayed that Polypyrrole coating did not change the structure of lithium ferric manganese phosphate, and the HRTEM image can clearly showed that the polypyrrole uniformly coated on the surface of LiFe 0.5 Mn 0.5 PO 4 nanorods. And the modified materials showed higher discharge capacity than the bare material.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the effect of conductive polymer coating on properties of polyanionic materials

He,

Wei,

Zhao

et al. 2024

Ninth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2023)

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“…There are generally two types of doping for LiMn x Fe 1– x PO 4 , namely, cation doping and anion doping. Cation doping includes Li site substitution , and M (M = Fe, Mn) site substitution, ,,− while anion doping includes polyanion substitution , and O 2– substitution . The selection principle and modification mechanism of element doping at each site are summarized as follows: Li site substitution.…”

Section: Electrochemical Performance Optimizationmentioning

confidence: 99%

Optimizing the Electrochemical Performance of Olivine LiMn_xFe_1–xPO₄ Cathode Materials: Ongoing Progresses and Challenges

Xu,

Sun,

Lyv

et al. 2024

Ind. Eng. Chem. Res.

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LiMn x Fe1–x PO4 is the most promising olivine-type cathode material following LiFePO4 in terms of development potential. However, several technological challenges remain in its widespread application, particularly in terms of its low electronic conductivity, slow Li+ diffusion rate, and undetermined optimal Mn/Fe ratio. To date, enormous efforts have been devoted to addressing the intrinsic defects of LiMn x Fe1–x PO4 to facilitate its electrochemical kinetics, and some companies have launched first-generation LiMn x Fe1–x PO4. In this review, the structural characteristics, lithium storage mechanism, and synthesis methods of LiMn x Fe1–x PO4 are first introduced. Wherein, a particular emphasis is placed on the rational design of precursors with tunable composition and tailored architecture, encompassing the Mn–Fe binary precursors and Mn–Fe–P ternary precursors. Then, up-to-date optimization strategies for improving the electrochemical performance of LiMn x Fe1–x PO4, such as Mn/Fe ratio optimizing, conductive material compositing, element doping, and morphology controlling are discussed comprehensively, with a special focus on the regulation of additional discharge plateau, which not only prevents the decrease of energy density but also maintains the consistency of LiMn x Fe1–x PO4 batteries. Finally, the critical issues, existing challenges, new research directions, and perspectives on further commercialization of LiMn x Fe1–x PO4 are also discussed.

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“…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%

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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The prepared and electrochemical property of Mg-doped LiMn0.6Fe0.4PO4/C as cathode materials for lithium-ion batteries

Cited by 20 publications

References 38 publications

Study on the effect of conductive polymer coating on properties of polyanionic materials

Study on the effect of conductive polymer coating on properties of polyanionic materials

Optimizing the Electrochemical Performance of Olivine LiMn_xFe_1–xPO₄ Cathode Materials: Ongoing Progresses and Challenges

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

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The prepared and electrochemical property of Mg-doped LiMn0.6Fe0.4PO4/C as cathode materials for lithium-ion batteries

Cited by 20 publications

References 38 publications

Study on the effect of conductive polymer coating on properties of polyanionic materials

Study on the effect of conductive polymer coating on properties of polyanionic materials

Optimizing the Electrochemical Performance of Olivine LiMnxFe1–xPO4 Cathode Materials: Ongoing Progresses and Challenges

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

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Optimizing the Electrochemical Performance of Olivine LiMn_xFe_1–xPO₄ Cathode Materials: Ongoing Progresses and Challenges

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