Multiple Ion Rectification Strategy Regulated Polyethylene Glycol‐Based Polymer Electrolyte for Stable High‐Voltage Lithium Metal Batteries

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 12, 2025

Abstract Polyethylene glycol (PEG)‐based polymer electrolyte has emerged as a class of promising solid electrolytes for lithium metal batteries (LMBs), but suffer from incompatibility with high‐voltage cathodes and uneven plating/stripping Li anode. Herein, modified C 3 N 4 additive dual defect sites cyano‐groups nitrogen‐vacancies (CN─Nv─C ) in PEG‐based is demonstrated, which can serve an effective functional ion rectifier to mitigate the cathode crosstalk, optimize conductive environment. Experimental characterization density theory (DFT) calculations reveal that high electronegative effectively traps transition cations through coordination, while N‐vacancies generate abundant electron‐deficient centers anchor anions thus significantly increase + transfer number. Specifically, CN─Nv─C modulated (GPE‐CNC) achieved ultra‐high number 0.72 conductivity 0.6 mS cm −1 at room temperature. Moreover, when matched LiNi Co 0.2 Mn O 2 cathode, GPE‐CNC operate stably rate 0.5 C, outstanding capacity retention 71% after 700 cycles. This multiple rectification strategy not only enhances voltage compatibility, also promotes electrolyte, offering inspiration development energy solid‐state batteries.

Language: Английский

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Critical Problems and Modification Strategies of Realizing High‐Voltage LiCoO₂ Cathode from Electrolyte Engineering

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 14(8)

Published: Dec. 15, 2023

Abstract As the pursuit of greater energy density for portable battery has stimulated exhaustive research in high‐voltage lithium‐ion batteries (LIBs), developing electrolyte additives is considered a cost‐efficient way to improve performance battery. Here, three interactional issues LiCoO 2 (LCO) commercial electrolytes at high voltage are summarized, this review first identifies an unavoidable vicious cycle voltage. LCO/electrolyte interphase break, dissolution transition metal (TM) ions, and formation harmful HF accelerate failing progress voltage, besides malfunction anode happens same time because electrode crosstalk. Then, modification summarized according solutions cycle. Last, framework future on LCO outlined.

Language: Английский

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In Situ Ion‐Exchange Metathesis Induced Conformal LiF Surface Films on Cathode (NMC811) as a Cathode Electrolyte Interphase

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(44)

Published: July 8, 2023

Abstract High‐capacity cathodes (LiNi 0.8 Mn 0.1 Co O 2 , NMC811) are promising for vehicle electrification because of their high gravimetric energy density. However, electrochemical performance still relies upon the stability cathode electrolyte interphase (CEI). A highly reactive interface leads to parasitic side reactions with electrolytes, resulting in accelerated capacity fading. Well‐developed LiF and LiF‐like inorganic compounds believed be good CEI components stabilizing such electrode interfaces. it is challenging form an optimal surface sub‐nanolayer on surfaces complexity reaction during battery cycling. Herein, formation a conformal layer NMC811 via situ ion‐exchange metathesis process reported, demonstrating LiF‐stabilized CEI. In generated LiF‐coated electrodes exhibit ≈97% retention up 100 cycles at 0.3 C rate average coulombic efficiency ≈99.9% ≈80% 200 1 >99.6%. This finding may pave way reengineering enhance performances cycling high‐capacity cathodes.

Language: Английский

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Stress Relief in Metal Anodes: Mechanisms and Applications

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(40)

Published: Sept. 15, 2023

Abstract Metal anodes (lithium/sodium/zinc) are recognized as the most promising choice for rechargeable batteries due to their high theoretical capacity and low electrochemical redox potential. Unfortunately, metal face serious dendrite problems, hindering practical applications. Recent research has shown that dendrites can also be caused by levels of stress generated during deposition process. To address this issue, an alternative strategy based on relief is proposed inhibit growth dendrites. Herein, work aims investigate mechanism generation evolution within anodes. In addition, explores utilization induce nucleation. This further discuss various experimental techniques used study release in review recent findings Specifically, examines how microstructure processing conditions affect potential strategies improving efficiency As a result, deeper understanding lead development with superior performance, longer cycle life, well enhanced safety applications fields.

Language: Английский

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Recent Progress on Multifunctional Electrolyte Additives for High‐Energy‐Density Li Batteries – A Review

ChemElectroChem, Journal Year: 2024, Volume and Issue: 11(14)

Published: April 15, 2024

Abstract The improvement of the safety, specific energy, cycle life and cost reduction Li‐ion batteries are hot research topics. Now, in pursuit high energy density, employed high‐energy‐density cathode/anode materials increased operation voltage challenge prevalent electrolyte formula, like existing ester ether electrolytes cannot withstand high‐voltage high‐capacity anode such as lithium (Li), silicon (Si) silicon‐graphite (Si−C) composite anode. It is recognized that stable electrolyte‐electrode interfaces can avoid side reactions protect electrode materials. Up to now, various additives have been developed modify electrode‐electrolyte interfaces, famous 4‐fluoroethylene carbonate, vinylene carbonate nitrate, LIBs metal (LMBs) performances improved greatly. However, lifespan higher‐energy‐density with Li/Si/Si−C high‐nickel layer oxides cathode meet request due lack ideal formula. In this review, we present a comprehensive in‐depth overview on additives, especially focused multifunctional reaction mechanisms fundamental design. Finally, novel insights, promising directions potential solutions for proposed motivate Li battery chemistries.

Language: Английский

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