Integrating robust SEI on recycled micro-sized silicon scrap for stable lithium ion battery

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160149 - 160149

Published: Feb. 1, 2025

Language: Английский

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Enhanced elevated-temperature performance of LiMn2O4 cathodes in lithium-ion batteries via a multifunctional electrolyte additive

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: unknown, P. 158219 - 158219

Published: Dec. 1, 2024

Language: Английский

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Highly Improved Cyclic Stability of High Voltage LiNi_0.6Co_0.2Mn_0.2O₂/Graphite Pouch Cells via a Silicon-Based Electrolyte Additive

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 17, 2025

The LiNi0.6Co0.2Mn0.2O2 (NCM622)/graphite composite has gained considerable traction in the realm of lithium-ion batteries owing to its favorable cost-performance ratio, high energy density, and inherent structural stability. However, unstable cathode anode interface at voltage represents a significant challenge further development. In this study, we propose an electrolyte additive, allyl trimethylsiloxysilane (TMSS), featuring dual-functional siloxane vinyl groups, construct low-resistance electrochemically stable interfaces on both electrodes. Remarkably, NCM622/graphite pouch cell cycled 4.35 V 1 C demonstrates significantly improved capacity retention, increasing from 58.8 80.0% after 800 cycles 18.8 73.0% 1000 compared baseline system. Theoretical calculations electrochemical characterizations reveal that TMSS with enriched group can preferentially adsorb NCM622 electrode surface be oxidized polysiloxane, which endows exceptional stability; meanwhile, oxidation intermediates capture F– HF during process, mitigates leaching transition metal ions cathode. As for anode, reduced utilize auto-polymerize, forming siloxane-framed enables development solid smaller resistance anode. Such exceedingly steady lower impedance layer effectively improve cycling stability batteries.

Language: Английский

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Enhancing High‐Voltage LNMO Cathode Performance in Li‐Metal Batteries Via Anionic Electrolyte Additive‐Integrated CEI Engineering

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

Published: Nov. 14, 2024

Abstract An anionic‐additive electrolyte system is introduced by incorporating Lithium tetrafluoroborate (LiBF 4 ) into a conventional base for high‐voltage LiNi₀.₅Mn₁.₅O₄ (LNMO) cathodes in lithium‐metal batteries. At high voltages, the sacrificial oxidation of LiBF mitigates degradation and forms robust cathode interface (CEI) enriched with boron fluorine‐based components, which protects against active material corrosion. Density Functional Theory (DFT) studies reveal that BF₄⁻ more readily oxidized, while MD simulations validate CEI's inorganic composition. Initial cycling specialized charge‐discharge protocol ensures optimal use additive, resulting uniform, thin (4–6 nm) CEI on LNMO cathode. The formed effectively suppresses transition metal dissolution surface degradation, enhancing long‐term performance. ‐enhanced also lowers overpotential promotes uniform Li deposition compared to electrolyte. 1 C‐rate, anode optimized achieves discharge capacity 115 mA h g⁻¹ an energy density 540 Wh kg⁻¹ over 500 cycles. These findings underscore ’s dual role protecting anodes, highlighting critical additives development advanced

Language: Английский

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Promoting Interfacial Reaction via Quantifying NMC811 CEI Evolution and Li⁺ Desolvation Using Single‐Particle Electrochemical Methods

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

Published: Oct. 9, 2024

Abstract Promoting interfacial kinetics of high‐nickel LiNi 0.8 Mn 0.1 Co O 2 (NMC811) is a critical strategy for enhancing rate capability lithium‐ion batteries (LIBs). At the solid‐liquid interface positive electrode, charge transfer across cathode‐electrolyte interphase (CEI) responsible redox reaction, which dominated by desolvation process Li + and NMC811 CEI evolution. Since these two processes are significantly impacted solvation effect electrolytes, herein single‐particle Raman spectroscopy probes established to quantitatively study influences on evolution , respectively. Owing oxidation unstable free cyclic carbonate ester from dissociation structure, found grow thicker during discharge process. Due decreased concentration in ethyl methyl carbonate‐ethylene electrolyte can be reduced 11.8% compared that dimethyl electrolyte. With presence electrolyte, thinner easier simultaneously achieved surface. Accordingly, its corresponding LIBs deliver highest specific capacity ≈138.8 mAh g −1 at 5C among with other commonly used electrolytes.

Language: Английский

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Ceramic–Polymer–Carbon Composite Coating on the Truncated Octahedron-Shaped LNMO Cathode for High Capacity and Extended Cycling in High-Voltage Lithium-Ion Batteries

Energy & Fuels, Journal Year: 2024, Volume and Issue: 38(21), P. 21456 - 21467

Published: Oct. 16, 2024

Long-term electrochemical cycle life of the LiNi0.5Mn1.5O4 (LNMO) cathode with liquid electrolytes (LEs) and inadequate knowledge cell failure mechanism are eloquent Achilles' heel to practical applications despite their large promise lower cost lithium-ion batteries (LIBs). Herein, a strategy for engineering cathode–LE interface is presented enhance LIBs. The direct contact between cathode-active particles LE controlled by encasing sol–gel-synthesized truncated octahedron-shaped LNMO an ion–electron-conductive (ambipolar) hybrid ceramic–polymer electrolyte (IECHP) via simple slot-die coating. IECHP-coated demonstrated negligible capacity fading in 250 cycles retention ∼90% after 1000 charge–discharge cycles, significantly exceeding that uncoated (a ∼57% 980 cycles) 1 M LiPF6 EC:DMC at C rate. difference stability two types cathodes cycling examined focused ion beam scanning electron microscopy time-of-flight secondary mass spectrometry. These studies revealed pristine produces inactive layer on surface, reducing ionic transport increasing resistance. IECHP coating successfully overcomes these limitations. Therefore, present work underlines adaptability as high-voltage material prolonged use. proposed affordable commercial applications.

Language: Английский

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Molecular-level designed single electrolyte additive with multifunctional groups enabling high mechanical properties/fast Li+ kinetics interphase for wide-temperature nickel-rich/graphite batteries

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 500, P. 157218 - 157218

Published: Nov. 1, 2024

Language: Английский

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Mitigating Li-Rich Layered Cathode Capacity Loss by Using a Siloxane Electrolyte Additive

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 9, 2024

The instability of the electrode-electrolyte interface in high-voltage cathode materials significantly hinders development high-energy-density lithium-ion batteries (LIBs). In this study, 1,3-diphenyl-1,1,3,3-tetramethyldisiloxane (DTS) is employed as an electrolyte additive to enhance cycling stability and capacity retention for Li||LLO (Li-rich layered oxide) operating at 4.8 V. Theoretical calculations show that DTS can preferentially oxidize on surface cathode. oxidation forms a robust (CEI) LLO surface, mitigating cracking, regeneration, irreversible phase transitions As anticipated, with exhibit 85.4% after 100 cycles V compared baseline (45.2%). Furthermore, these demonstrate superior V, even presence 1000 ppm H

Language: Английский

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Mitigating Crosstalk by Slurry Additive Toward 5 V Cobalt‐Free LiNi_0.5Mn_1.5O₄ Cathode

Small, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 10, 2024

LiNi

Language: Английский

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UV‐Triggered In Situ Formation of a Robust SEI on Black Phosphorus for Advanced Energy Storage: Boosting Efficiency and Safety via Rapid Charge Integration Plasticity

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

Published: Oct. 23, 2024

Abstract Black phosphorus (BP) emerges as a highly promising electrode material for next generation of energy‐storage systems. Yet, its full potential is hindered by the instability solid‐electrolyte interphase (SEI) and inflammability liquid Here pioneering UV‐induced in situ strategy introduced SEI construction, which leverages rapid electron supply to fracture sulfur‐dihalide bonds. This technique yields internal dihalide inorganic components an external polymer segment, with any excess organic being purged through pores. The (E)‐2‐chloro‐4‐((3′‐chloro‐4′‐hydroxyphenyl)diazinyl)phenyl acrylate (CA), chlorine‐terminated groups, initially transformed into flame‐retardant phenyl carboxylic acid (PCA), then encapsulated within ultrathin BP nanostructure, further nested nitrogen (N), boron (B) co‐doped carbon (C) sheets that accommodate cobalt (Co) single atoms/nanoclusters (Co‐NBC). Co‐NBC@BP@PCA construct demonstrates impressive initial Coulombic efficiency (ICE) 99.1% maintains exceptional stabilities terms mechanical, chemical, electrochemical performancecritical prolonged cycle calendar life. research sheds light on interplay between charge integrated plasticity (RSIP) approach proactive establishment artificial layer, offering profound insights enhancing durability providing solid foundation advancements energy storage technology.

Language: Английский

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