Reinforced Li/Garnet Interface by Ceramic Metallization‐Assisted Room‐Temperature Ultrasound Welding

Carbon Neutralization, Journal Year: 2024, Volume and Issue: 4(1)

Published: Dec. 6, 2024

ABSTRACT Solid‐state lithium metal batteries (SSLMBs), heralded as a promising next‐generation energy storage technology, have garnered considerable attention owing to inherent high safety and potential for achieving density. However, their practical deployment is hindered by the formidable interfacial challenges, primarily stemming from poor wettability, (electro) chemical instability, discontinuous charge/mass transport between solid‐state electrolytes Li metal. To overcome these obstacles, taking garnet‐based electrolyte (Li 6.5 La 3 Zr 1.5 Ta 0.5 O 12 , LLZTO) pathfinder, ceramic metallization‐assisted room‐temperature ultrasound werlding (UW) has been developed reinforce Li/LLZTO interface. This welding approach constructs compact interface that facilitates rapid + /e − transport, while formation of Li−M (M = Au, Ag, Sn) alloy homogenizes distribution at By optimization, atomic‐level contact achieved welding, coupled with nanosized Au modification layer, significantly reduces resistance 5.4 Ω cm 2 marked decrease compared static pressing methods (1727 ). The symmetric cell exhibits critical current density 1 mA −2 sustains long‐term stability over 1600 h 0.3 plating/stripping overpotential < 45 mV. incorporating robust anode‐side into batteries, LiFePO 4 ‐based full battery contributes 118.4 mAh g⁻ after 600 cycles C (capacity: ∼100%). study offers facile effective bolster electrolytes, paving way development high‐performance batteries.

Language: Английский

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Application of Li6.4La3Zr1.45Ta0.5Mo0.05O12/PEO Composite Solid Electrolyte in High-Performance Lithium Batteries

Materials, Journal Year: 2024, Volume and Issue: 17(13), P. 3094 - 3094

Published: June 24, 2024

Replacing the flammable liquid electrolytes with solid ones has been considered to be most effective way improve safety of lithium batteries. However, often suffer from low ionic conductivity and poor rate capability due their relatively stable molecular/atomic architectures. In this study, we report a composite electrolyte, in which polyethylene oxide (PEO) is matrix Li6.4La3Zr1.45Ta0.5Mo0.05O12 (LLZTMO) Li6.4La3Zr1.4Ta0.6O12 (LLZTO) are fillers. Ta/Mo co-doping can further promote ion transport capacity electrolyte. The synthesized exhibit high thermal stability (up 413 °C) good (LLZTMO–PEO 2.00 × 10−4 S·cm−1, LLZTO–PEO 1.53 S·cm−1) at 35 °C. Compared pure PEO whose range 10−7~10−6 greatly improved. full cell assembled LiFePO4 as positive electrode exhibits excellent performance cycling stability, indicating that prepared have great potential applications

Language: Английский

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Rapid Characterization of Point Defects in Solid-State Ion Conductors Using Raman Spectroscopy, Machine-Learning Force Fields, and Atomic Raman Tensors

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 18, 2024

The successful design of solid-state photo- and electrochemical devices depends on the careful engineering point defects in ion conductors. Characterization is critical to these efforts, but best-developed techniques are difficult time-consuming. Raman spectroscopy─with its exceptional speed, flexibility, accessibility─is a promising alternative. signatures arise from due local symmetry breaking structural distortions. Unfortunately, assignment often hampered by shortage reference compounds corresponding spectra. This issue can be circumvented calculation defect-induced first principles, this computationally demanding. Here, we introduce an efficient computational procedure for prediction defect Our method leverages machine-learning force fields "atomic tensors", i.e., polarizability fluctuations motions individual atoms. We find that our reduces cost up 80% compared existing first-principles frozen-phonon approaches. These efficiency gains enable synergistic computational-experimental investigations, case allowing us precisely interpret spectra Sr(Ti

Language: Английский

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Development of 2D Framework Structures-Based Solid-State Electrolytes with Fast Ion-Transport Channels Using Ionic Liquids Encapsulated in 2D-LiMNT Frameworks

ACS Applied Energy Materials, Journal Year: 2024, Volume and Issue: 7(14), P. 5905 - 5913

Published: July 2, 2024

The use of three-dimensional (3D) framework materials to encapsulate ionic liquids is a novel method for the preparation solid-state electrolytes (SSEs). However, these types SSEs face problems such as unstable structures, narrow pore sizes that restrict organic macromolecules while hindering Li+ migration, and high viscosity liquids. Herein, two-dimensional (2D) lithium-montmorillonite (LiMNT) was used containing propylene carbonate (PC) solvent. PC solvent reduced activated in LiMNT, an efficient 2D transport channel formed inside SSE. conductivity prepared lithium-based liquid (LiIL)-PC@LiMNT SSE 6.2 × 10–4 S·cm–1, mobility number 0.35 observed. At current density 0.2 mA·cm–2, lithium dissolution–deposition experiment symmetric batteries operated stably 1000 h. Solid-state metal with LiFePO4 cathodes were able achieve reversible capacity 121.1 mAh·g–1 after 120 cycles at 0.3C, retention 87.4%. This demonstrated excellent performance LiIL-PC@LiMNT work provides design idea development based on structures using encapsulated construction fast ion-transport channels.

Language: Английский

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Novel Strategy for Designing rGO@LLZTO@Li Composite Lithium Powder Anodes with a Dual Conducting Ion-Electron Channel for High-Energy-Density Lithium Metal Batteries

The Journal of Physical Chemistry C, Journal Year: 2024, Volume and Issue: 128(26), P. 10810 - 10817

Published: June 25, 2024

Lithium metal anode (LMA) has been used as a promising material for designing high-energy-density lithium batteries (LMBs). However, the traditional plain Li foil will cause dendrite growth owing to lithium-ion nonuniform deposition. Here, dual conducting ion-electron channel composite powder (CLPA) was designed, which is composed of rGO@LLZTO (rGO: reduced graphene oxide, LLZTO: Li6.75La3Zr1.75Ta0.25O12) and (rGO@LLZTO@Li CLPA). The prepared rGO@LLZTO@Li CLPA can guide uniform nucleation inhibiting growth. Moreover, Li//Li symmetric cells or Li//Cu asymmetric assembled with exhibit superior electrochemical performance. Furthermore, Li//LiFePO4 Li//LiNi0.8Co0.1Mn0.1O2 also demonstrate an improved cycling stability rate property, presenting its great potential application LMA next-generation LMBs.

Language: Английский

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Insights into Defect Kinetics, Mass Transport, and Electronic Structure from Spectrum Effects in Ion-Irradiated Bi₂O₃

Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: 12(45), P. 31445 - 31458

Published: Jan. 1, 2024

Ion-irradiation of α-Bi 2 O 3 induces amorphization, altering mass transport and band structure.

Language: Английский

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Exploring Structural Anisotropy in Amorphous Tb-Co via Changes in Medium-Range Ordering

Microscopy and Microanalysis, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 14, 2024

Abstract Amorphous thin films grown by magnetron co-sputtering exhibit changes in atomic structure with varying growth and annealing temperatures. Structural variations influence the bulk properties of films. Scanning nanodiffraction performed a transmission electron microscope (TEM) is applied to amorphous Tb17Co83 (a-Tb-Co) deposited over range temperatures measure relative medium-range ordering (MRO). These measurements reveal an increase MRO higher decrease The trend indicates relationship between conditions local ordering. By tilting select films, TEM measures as function orientation within findings support claims that preferential along direction results from temperature-mediated adatom configurations during deposition, oriented correlates increased structural anisotropy, explaining strong growth-induced perpendicular magnetic anisotropy found rare earth–transition metal Beyond we propose tilted FEM workflow method extracting anisotropic information variety materials directionally dependent properties, such inherent bonding asymmetry physical vapor deposition.

Language: Английский

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