Performance Degradation Mechanism of High-Nickel Cathode Depending on Discharge Rates and Charge Voltages during Long-Term Cycling

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: April 13, 2025

This study investigates the degradation mechanisms of high-nickel (Ni) layered oxide (LiNi0.83Co0.11Mn0.06O2) under varying discharge C-rates at a high cut-off voltage (4.3 V) during long-term cycling. Contradictory to conventional knowledge, low rate (0.1C) results in worse cycle performance than (1C) voltage. In-depth transmission electron microscopy analysis reveals that C-rate condition, more Ni ions are reduced from +3 +2, yet structure is maintained. In contrast, C-rate, retain their valence but phase transition periodically ordered spinel occurs some portion. The prolonged dwell time forces Li layers be locally ordered, and this critically affects Therefore, underscores setting proper can significant C-rate.

Language: Английский

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Performance of 3D Network-Structured LiFePO4@Li3V2(PO4)3/Carbon Nanofibers via Coaxial Electrospinning as Self-Supporting Cathode for Lithium-Ion Batteries

Materials, Journal Year: 2025, Volume and Issue: 18(9), P. 1969 - 1969

Published: April 26, 2025

Lithium-ion batteries (LIBs) with high power, capacity, and support for fast charging are increasingly favored by consumers. As a commercial electrode material power batteries, LiFePO4 was limited from further wide application due to its low conductivity lithium-ion diffusion rate. The development of advanced architectures integrating rational conductive networks optimized ion transport pathways represents critical frontier in optimizing the performance cathode materials. In this paper, novel self-supporting (designated as LFP@LVP-CES) synthesized through an integrated coaxial electrospinning controlled pyrolysis strategy. This methodology directly converts LiFePO4, Li3V2(PO4)3, polyacrylonitrile (PAN)) into flexible, binder-free cathodes hierarchical structural organization. 3D carbon nanofiber (CNF) matrix synergistically integrates (Li/Fe/POx) Li3V2(PO4)3 (Li/V/POx) nanoparticles, where CNFs act scaffold enhance electron transport, while POx polyanionic frameworks stabilize Li+ pathways. Morphological characterizations (SEM TEM) revealed cross-connected (diameter: 250 ± 50 nm) uniformly embedded active particles. Electrochemical evaluations demonstrated that LFP@LVP-CES delivers initial specific capacity 165 mAh·g-1 at 0.1 C, maintaining 80 5 C. Notably, exhibited exceptional rate capability cycling stability, demonstrating 96% recovery after high-rate upon returning along 97% retention over 200 cycles 1 Detailed kinetic analysis EIS significantly reduced Rct increased diffusion. superior electrochemical can be attributed synergistic effects between network architecture dual Compared traditional coating processes high-temperature calcination, preparation controllable low-temperature some extent avoid introduction harmful substances reduce raw consumption emissions. original integration strategy establishes paradigm designing freestanding design combined bimodal material, providing insights next-generation energy storage systems.

Language: Английский

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Recovery and regeneration of ternary cathode materials through Solid-State reactions

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 163628 - 163628

Published: May 1, 2025

Language: Английский

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LiFePO4 (LFP) coating and blending on Li1.05(Ni0.88Co0.08Mn0.04)O2 (Ni-rich NCM): A strategy for reduced gas generation

Journal of Alloys and Compounds, Journal Year: 2025, Volume and Issue: unknown, P. 180771 - 180771

Published: May 1, 2025

Language: Английский

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