In Situ Polymerized Polyfluorinated Crosslinked Polyether Electrolytes for High‐Voltage Lithium Metal Batteries

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

Published: May 2, 2025

Abstract In situ polymerized polyether electrolytes are promising for solid‐state Li metal batteries due to their high ionic conductivity and excellent interfacial contact. However, practical application is hindered by dendrite formation, degradation, limited oxidative stability. Herein, we propose an in polyfluorinated crosslinked electrolyte (PDOL‐OFHDBO), synthesized copolymerizing 1,3‐dioxolane (DOL) with 2,2′‐(2,2,3,3,4,4,5,5‐octafluorohexane‐1,6‐diyl)bis(oxirane) (OFHDBO) as a crosslinker. The electron‐withdrawing groups endow PDOL‐OFHDBO enhanced stability compatibility, while reducing the solvation power of polymer matrix promote anion‐derived inorganic‐rich solid interphase uniform deposition. Consequently, exhibits wide electrochemical window (>5.6 V) enables long‐term stable plating/stripping over 1100 h. Furthermore, Li||LiNi 0.8 Co 0.1 Mn O 2 (NCM811) full cells utilizing demonstrate outstanding cycling high‐loading cathodes (≈3.8 mAh cm −2 ) thin anodes (50 µm), achieving capacity retention 95.5% 89.1% 100 cycles at cut‐off voltages 4.3 4.5 V, respectively. Remarkably, Ah‐level Li||NCM811 pouch deliver impressive specific energy 401.8 Wh kg −1 , highlighting potential batteries.

Language: Английский

Understanding the Electrochemical Window of Solid-State Electrolyte in Full Battery Application

Chemical Reviews, Journal Year: 2025, Volume and Issue: unknown

Published: May 8, 2025

In recent years, solid-state Li batteries (SSLBs) have emerged as a promising solution to address the safety concerns associated. However, limited electrochemical window (ECW) of electrolytes (SEs) remains critical constraint full battery application. Understanding factors that influence ECW is an essential step toward designing more robust and high-performance systems. This review provides detailed classification various "windows" SEs comprehensive understanding associated interfacial stability in The paper begins with historical overview SE development, followed by discussion their structural characteristics. Next, examination methodologies used calculate measure presented, culminating proposal standardized testing procedures. Furthermore, analysis numerous parameters thermodynamic provided, along synthesis strategies these challenges. At last, this concludes in-depth exploration issues exhibiting narrow ECWs SSLBs.

Language: Английский

Analogue Molecular Doping Engineering Enables High Ionic Conductivity of Polyvinylidene Fluoride-Based Polymer Electrolytes

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

Published: May 22, 2025

Solid polymer electrolytes (SPEs) based on polyvinylidene fluoride (PVDF) are promising candidates due to their outstanding mechanical properties and intrinsic safety features. Unfortunately, the crystalline α phase of PVDF limits mobility lithium ions, thus leading low ion conductivity. Herein, a molecular doping strategy is proposed achieve high conductivity PVDF-based electrolyte (md-PVDF) via introducing dichloride (PVDC) reduce generation harmful PVDF. As analog PVDF, PVDC homogeneously dispersed in at arbitrary concentrations, it disrupts crystallization matrix. Moreover, chlorine functional group not only enhances dissociation Li salt but also reduces energy barrier lithium-ion migration. Consequently, resulting md-PVDF show significantly ionic (1.4 × 10-3 S cm-1 room temperature). The symmetric batteries with cycle stably for over 2000 h 0.1 mA cm-2, Li||LFP display excellent cycling stability 500 cycles rate 5 C. In addition, exhibit low-temperature performance, achieving an 3.0 10-4 -5 °C. This work demonstrates improve SPEs realize fast charging solid-state lithium.

Language: Английский