A high potential (2.5 V) carbon fiber paper-based asymmetric supercapacitor with oxygen vacancies and hierarchical porous hollow structure

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 496, P. 154165 - 154165

Published: July 26, 2024

Language: Английский

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Reinforcing ion diffusion and controlling microcrack of nickel-rich cobalt-free single-crystalline cathodes via interfacial protection and bulk optimization

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 684, P. 138 - 147

Published: Jan. 11, 2025

Language: Английский

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Lithium Tracer Diffusion in LixCoO2 and LixNi1/3Mn1/3Co1/3O2 (x = 1, 0.9, 0.65)-Sintered Bulk Cathode Materials for Lithium-Ion Batteries

Batteries, Journal Year: 2025, Volume and Issue: 11(2), P. 40 - 40

Published: Jan. 21, 2025

The knowledge of Li diffusivities in electrode materials Li-ion batteries (LIBs) is essential for a fundamental understanding charging/discharging times, maximum capacities, stress formation and possible side reactions. literature indicates that diffusion the cathode material Li(Ni,Mn,Co)O2 strongly increases during electrochemical delithiation. Such an increased diffusivity will be advantageous performance if it present already initial state after synthesis. In order to understand influence varying content on diffusion, we performed tracer experiments LixCoO2 (LCO) LixNi1/3Mn1/3Co1/3O2 (NMC, x = 1, 0.9, 0.65) materials. measurements were polycrystalline sintered bulk materials, free additives binders, study intrinsic properties. variation was achieved using reactive solid-state synthesis pressed Li2CO3, NiO, Co3O4 and/or MnO2 powders high temperature sintering at 800 °C. XRD analyses showed resultant samples exhibit layered LCO or NMC phases with low amount cation intermixing. Moreover, presence additional NiO detected pronounced nominal deficiency 0.65. As source, 6Li layer same chemical composition deposited ion beam sputtering. Secondary mass spectrometry depth profile mode used isotopic analysis. followed Arrhenius law activation enthalpy about 0.8 eV nearly identical within error all investigated range up 500 For mechanism based structural vacancies, results indicated does not result change vacancy concentration. Consequently, design use initially made Li-deficient improve kinetics battery performance. reasons this unexpected are discussed.

Language: Английский

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Boosting Li+ transport kinetics and structural stability of Co-free LiNi0.9Mn0.1-Al O2 cathode materials

Journal of Electroanalytical Chemistry, Journal Year: 2025, Volume and Issue: 986, P. 119092 - 119092

Published: March 31, 2025

Language: Английский

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High-throughput screening of Ni-rich layered cathode materials for sodium-ion batteries based on machine learning

Journal of Alloys and Compounds, Journal Year: 2025, Volume and Issue: unknown, P. 180282 - 180282

Published: April 1, 2025

Language: Английский

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Brominated phosphoric acid tri-p-cresyl ester modified single-crystalline LiNi0.8Co0.1Mn0.1O2 toward enhanced cycling performance

Journal of Power Sources, Journal Year: 2025, Volume and Issue: 645, P. 237183 - 237183

Published: April 29, 2025

Language: Английский

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Regulating the Charge Distribution of Oxygen by High-Entropy Doping to Stabilize Single-Crystal Ni-Rich Cathode Materials

ACS Applied Energy Materials, Journal Year: 2024, Volume and Issue: 7(16), P. 6961 - 6971

Published: Aug. 5, 2024

Single-crystal Ni-rich ternary cathode materials (811), with their comprehensive advantage of high energy density and low manufacturing cost, have been considered the most promising for Li-ion batteries. Due to strong O-p/TM-d covalent hybridization, complete oxidation Ni ions during electrochemical cycling is often accompanied by inevitable oxygen loss, resulting in an irreversible surface phase transition, accumulated lattice stress, poor thermal stability. Considering fact that introducing heteroatoms into traditional doping systems can alter electron distribution around coordinated oxygen, compositionally complex based on high-entropy may a more significant effect stabilizing oxygen. Herein, strategy was applied design synthesize single-crystal NCM811 cathodes (HE811) through molten salt method. Compared 811, HE811 show excellent initial Coulombic efficiency 90.74% at 0.2C deliver higher capacity retention 80.79% after 300 cycles 1C between 2.8 4.3 V. Owing doping, densities multidopants are increased, inhibiting excessive improving stability TMO6 coordination structures. This work could provide insights effects modulating charge high-energy-density long-term cycling.

Language: Английский

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Machine learning-assisted precision reverse design research of ternary cathode materials: A new paradigm for material design

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 680, P. 505 - 517

Published: Nov. 19, 2024

Language: Английский

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Lifecycle Evaluation of Lithium-Ion Batteries Under Fast Charging and Discharging Conditions

Batteries, Journal Year: 2025, Volume and Issue: 11(2), P. 65 - 65

Published: Feb. 7, 2025

By employing electrochemical impedance spectroscopy, we performed an analysis of three commercial Li-ion Panasonic NCR18650B cells in order to investigate the direct effects their internal on operating voltage, rate capability, and efficiency practical capacity. We aimed assess performance, safety, longevity when distinct fast charge/discharge rates were applied. maintaining a constant discharge 2C, monitored degradation speed influence C-rates LIBs by applying charge rates, namely, 1C, 1.5C, 2C. In understand how performance correlates with usage conditions, SoH evolution analysis, together Q–Q0 total energy consumption examination, was performed, taking into account that cycling monitoring is vital for ensuring and/or safety. Increasing Icharge from 1C 1.5C reduces battery lifetime ~50%, while case decrease almost ~70% due capacity loss accelerates quickly increase. Moreover, latter cell, last can only go up ~80% SoH, as no longer support faster degradation. agreement these results, fluctuations become more pronounced, clearly affecting LIB efficiency. High add additional high voltage increases batteries’ stress, leading shorter lifetime. Energy data follow same trend, which decreases dramatically losses appear because resistance causes heat be produced during both charging discharging.

Language: Английский

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Integration of gel polymer electrolytes with dry electrodes for quasi-solid-state batteries

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 498, P. 155544 - 155544

Published: Sept. 6, 2024

Language: Английский

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