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

Industrial & Engineering Chemistry Research, Journal Year: 2024, Volume and Issue: 63(18), P. 8228 - 8238

Published: April 26, 2024

Li(Fe0.6Mn0.4)1–xTixPO4/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 high-temperature solid-phase techniques. The composition, microstructure, surface morphology these materials thoroughly characterized using suite analytical These analyses confirmed the successful doping Ti ions into olivine lattice, resulting in decrease unit cell volume formation an amorphous carbon layer on particles' surfaces, which also improved particle dispersion. electrochemical performance samples was assessed techniques including constant current charge–discharge testing, cyclic voltammetry, impedance spectroscopy. findings showed that Ti-doping markedly diminishes potential polarization strong Ti–O coordination suppresses Jahn–Teller effect Mn3+, effectively enhancing stability lithium-ion diffusion rate material. Additionally, density functional theory (DFT) calculations conducted to assess impact LFMP. reveal reduces bandgap material increases bond length Li–O, thereby further confirming can enhance electronic conductivity. Among them, Li(Fe0.6Mn0.4)1–xTixPO4/C-3%Ti exhibited best performance. optimized sample demonstrated specific discharge capacity 163.53 mAh·g–1 at 0.1C, accompanied by initial coulombic efficiency 93.18%. At 1C, it provided 140.59 mAh·g–1, sustaining retention 93.58% after 500 cycles, delivered 94.08 5C.

Language: Английский

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

Industrial & Engineering Chemistry Research, Journal Year: 2024, Volume and Issue: 63(22), P. 9631 - 9660

Published: May 23, 2024

LiMnxFe1–xPO4 is the most promising olivine-type cathode material following LiFePO4 in terms of development potential. However, several technological challenges remain its widespread application, particularly low electronic conductivity, slow Li+ diffusion rate, and undetermined optimal Mn/Fe ratio. To date, enormous efforts have been devoted to addressing intrinsic defects facilitate electrochemical kinetics, some companies launched first-generation LiMnxFe1–xPO4. In this review, structural characteristics, lithium storage mechanism, synthesis methods are first introduced. Wherein, a particular emphasis placed on rational design precursors with tunable composition tailored architecture, encompassing Mn–Fe binary Mn–Fe–P ternary precursors. Then, up-to-date optimization strategies for improving performance LiMnxFe1–xPO4, such as ratio optimizing, conductive compositing, element doping, morphology controlling discussed comprehensively, special focus regulation additional discharge plateau, which not only prevents decrease energy density but also maintains consistency batteries. Finally, critical issues, existing challenges, new research directions, perspectives further commercialization discussed.

Language: Английский

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Modification of LiMn0·6Fe0·4PO4 lithium-ion battery cathode materials with a fluorine-doped carbon coating

Particuology, Journal Year: 2024, Volume and Issue: 92, P. 278 - 287

Published: May 31, 2024

Language: Английский

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Synergistic effect of hydrogen bond and carbon coating to suppress the capacity and voltage fading in Li-Rich cathode

Carbon, Journal Year: 2024, Volume and Issue: 228, P. 119309 - 119309

Published: June 4, 2024

Language: Английский

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Relaxing the Jahn–Teller distortion of LiMn_0.6Fe_0.4PO₄ cathodes via Mg/Ni dual-doping for high-rate and long-life Li-ion batteries

Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: 12(38), P. 26076 - 26082

Published: Jan. 1, 2024

The synergistic doping of divalent Mg 2+ and Ni ions into a carbon-coated LiMn 0.6 Fe 0.4 PO 4 cathode significantly enhances reaction kinetics structural stability by mitigating the Jahn–Teller effect accelerating Li-ion migration rate.

Language: Английский

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A simple spray drying-assisted solid-state synthesis of LiFe0.67Mn0.33PO4/C cathode material for lithium-ion batteries

Ionics, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 8, 2025

Language: Английский

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A 3D continuous mesoporous carbon framework enhances electronic/ionic kinetics of LiMn0.6Fe0.4PO4 cathode for high-performance lithium-ion batteries

Carbon, Journal Year: 2025, Volume and Issue: unknown, P. 120257 - 120257

Published: March 1, 2025

Language: Английский

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Stress‐Induced Anomalous Lithiation Plateau of LiFe_yMn_1−yPO₄ Over High‐Rate Discharging

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 27, 2024

Abstract Olivine‐type LiFe y Mn 1− PO 4 (LFMP) is a promising cathode candidate with high energy density, chemical stability, and cost efficiency. However, an unidentified anomalous lithiation plateau (P II) often emerges between the 2+ /Mn 3+ Fe /Fe redox reactions, leading to decrease in density. Herein, it demonstrated that P II originates from couple, yet differs classical reaction due its lower operating voltage. During lithiation, Li + initially accumulates on particle surface, forming lithium‐rich phase, while interior remains lithium‐poor phase. As proceeds, two‐phase boundary experiences local compressive stress counteracting forces during expansion. This compresses lattice, thereby lowering voltage of inducing formation II. Such effect exacerbated by increased C‐rates higher Mn‐content. Interestingly, acts as double‐edged sword enhancing diffusion kinetics mitigating Jahn–Teller distortion, fully unlocking capacity . Furthermore, particle‐size‐reduction strategy developed address II, which decreases contribution 28.59% 7.77% at 2 C. These findings deepen understanding mechanisms LFMP offer novel insights for developing high‐power/voltage olivine‐type cathodes.

Language: Английский

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Modulating Discharge Capacity and Cycling Performance of Limn0.6fe0.4po4 Cathode for Lithium-Ion Batteries Via Titanium Introduction

Published: Jan. 1, 2024

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Language: Английский

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Recovery of spent LiFePO4: Unveiling iron migration mechanism towards selective lithium extraction

Separation and Purification Technology, Journal Year: 2024, Volume and Issue: unknown, P. 131314 - 131314

Published: Dec. 1, 2024

Language: Английский

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