Publications by authors named "Weili Song"

The stable operation of high-capacity lithium-sulfur batteries (LSBs) has been hampered by slow conversion kinetics of lithium polysulfides (LiPSs) and instability of the lithium metal anodes. Herein, 6-(dibutylamino)-1,3,5-triazine-2,4-thiol (DTD) is introduced as a functional additive for accelerating the kinetics of cathodic conversion and modulating the anode interface. We proposed that a coordination interaction mechanism drives the polysulfide conversion and modulates the Li solvated structure during the binding of the N-active site of DTD to LiPSs and lithium salts.

View Article and Find Full Text PDF

As a promising solution for solid-state batteries with high energy density and safety, understanding the mechanism of fast ion conduction in polymer-ceramic composite solid-state electrolytes (CSEs) is still a challenging task. Herein, we understand the enhanced ion conduction in CSEs using a series of ionic spectra. Ionic insight is extended to ion conduction in CSEs, resolving the mechanism of fast ion migration.

View Article and Find Full Text PDF

Petroleum cokes are largely used as low-cost anodes in aluminum industries and general fuels in cement industries, where large amounts of CO are generated. To reduce CO release, it is challenging to develop green strategies for processing abundant petroleum cokes into high-value products, because there are abundant hetero-atoms in petroleum cokes. To overcome such issues, a sustainable electrochemical approach is proposed to convert ultralow-cost high sulfur petroleum coke and iron powders into high-efficiency catalysts for hydrogen evolution reaction (HER).

View Article and Find Full Text PDF

The positive electrodes of non-aqueous aluminum ion batteries (AIBs) frequently encounter significant issues, for instance, low capacity in graphite (mechanism: anion de/intercalation and large electrode deformation induced) and poor stability in inorganic positive electrodes (mechanism: multi-electron redox reaction and dissolution of active materials induced). Here, metallo-porphyrin compounds (employed Fe, Co, Ni, Cu, and Zn as the ion centers) are introduced to effectively enhance both the cycling stability and reversible capacity due to the formation of stable conjugated metal-organic coordination and presence of axially coordinated active sites, respectively. With the regulation of electronic energy levels, the d-orbitals in the redox reactions and electron transfer pathways can be rearranged.

View Article and Find Full Text PDF

Elucidating the mechanical forces between two solid surfaces immersed in a communal liquid environment is crucial for understanding and controlling adhesion, friction, and electrochemistry in many technologies. Although traditional models can adequately describe long-range mechanical forces, they require substantial modifications in the nanometric region where electronic effects become important. A hybrid quantum-classical model is employed herein to investigate the separation-dependent disjoining pressure between two metal surfaces immersed in an electrolyte solution under potential control.

View Article and Find Full Text PDF

Nonaqueous organic aluminum batteries are considered as promising high-safety energy storage devices due to stable ionic liquid electrolytes and Al metals. However, the stability and capacity of organic positive electrodes are limited by their inherent high solubility and low active organic molecules. To address such issues, here porphyrin compounds with rigid molecular structures present stable and reversible capability in electrochemically storing AlCl .

View Article and Find Full Text PDF
Article Synopsis
  • Liquid-phase mass transport is crucial for the stability of lithium-ion batteries, but its mechanisms in separators are not fully understood due to complex internal environments during battery use.
  • In-situ local electrochemical impedance spectroscopy was used to study the impacts of separator microstructure and electrolyte properties on mass transfer, revealing that reduced porosity leads to higher overpotentials.
  • The research established relationships between separator geometry (porosity, tortuosity, thickness) and performance, noting that higher electrolyte viscosity increases resistance, which in turn affects polarization and overall battery performance, laying groundwork for more stable lithium-ion batteries.
View Article and Find Full Text PDF

Photovoltaic cells (PVs) are able to convert solar energy to electric energy, while energy storage devices are required to be equipped due to the fluctuations of sunlight. However, the electrical connection of PVs and energy storage devices leads to increased energy consumption, and thus energy storage ability and utilization efficiency are decreased. One of the solutions is to explore an integrated photoelectrochemical energy conversion-storage device.

View Article and Find Full Text PDF

The consistency of lithium-ion battery performance is the key factor affecting the safety and cycle life of battery packs. Surface engineering of electrodes in production processes plays an important role in improving the consistency of battery performance. In this study, the drying process in the electrode manufacturing process is studied as the effect on surface engineering of the electrode materials, with consideration on impacting the battery performance.

View Article and Find Full Text PDF

Achieving high energy density and long cycling life simultaneously remains the most critical challenge for aluminum-ion batteries (AIBs), especially for high-capacity conversion-type positive electrodes suffering from shuttle effect in strongly acidic electrolytes. Herein, we develop a layered quasi-solid AIBs system with double reaction zones (DRZs, Zone 1 and Zone 2) to address such issues. Zone 1 is designed to accelerate reaction kinetics by improving wetting ability of quasi-solid electrolyte to active materials.

View Article and Find Full Text PDF

Owing to high-efficiency and scalable advantages of electrolysis in molten salts, electrochemical conversion of carbonaceous resources into graphitic products is a sustainable route for achieving high value-added carbon. To understand the complicated kinetics of converting amorphous carbon (e.g.

View Article and Find Full Text PDF
Article Synopsis
  • Petroleum coke (PC) is commonly used for making electrodes in aluminum electrolysis and lithium-ion batteries, but produces a large amount of CO gases, prompting the need for eco-friendly alternatives.
  • Researchers propose a new method for converting high-sulfur PC into graphitic nanomaterials using a simple, catalyst-free process in molten CaCl-LiCl at low temperatures, significantly reducing energy consumption compared to traditional methods.
  • The resulting graphite has a competitive capacity for use as a negative electrode in lithium-ion batteries, indicating a promising way to transform low-value materials into high-quality resources for energy storage.
View Article and Find Full Text PDF

The relationship between interface structure (e. g., the facet of the solid phase and the configuration of solvation) and the reactivity of the corresponding electrode is a critical issue in electrochemistry.

View Article and Find Full Text PDF
Article Synopsis
  • Volume expansion of electrodes during ion intercalation in aluminum-ion batteries (AIBs) can weaken adhesion to current collectors, leading to potential detachment issues.
  • A new concept called the "dead zone" is introduced, which uses a surface modification of MXene film to create a negative-charge region that repels AlCl intercalation, forming a protective inert layer.
  • This innovation significantly improves electrode adhesion and extends battery cycle life to up to 50,000 cycles, suggesting a promising direction for future advancements in current collectors for different battery types.
View Article and Find Full Text PDF

Dynamic color display can be realized by tunable optical metasurfaces based on the compositional or structural control. However, it is still a challenge to realize the efficient modulation by a single-field method. Here, we report a novel compositional and mechanical dual-altered rechargeable metasurface for reversible and broadband optical reconfiguration in both visible and near-infrared wavelength regions.

View Article and Find Full Text PDF

Rechargeable aluminum-ion batteries have attracted significant attention as candidates for next-generation energy storage devices owing to their high theoretical capacity, safe performance, and abundance of raw materials. Al metal is the best option as the negative electrode, while its issues such as dendrite growth and corrosion accompanying hydrogen evolution in ionic liquid electrolyte have been seriously overlooked. Understanding the electrochemical mechanism of the surface evolution behavior of Al metal is a vital pathway for solving these issues.

View Article and Find Full Text PDF

Objectives: To evaluate the clinical effect of magnesium aluminum carbonate combined with rabeprazole-based triple therapy in the treatment of patients with Helicobacter pylori-positive gastric ulcer associated with hemorrhage.

Methods: A total of 80 patients with Helicobacter pylori-positive gastric ulcer associated with hemorrhage admitted to the Baoding First Central Hospital from January 2019 to December 2020 were selected and randomly divided into two groups, with 40 cases in each group. The control group were given rabeprazole-based triple therapy, while the experimental group were treated with magnesium aluminum carbonate on the basis of the control group.

View Article and Find Full Text PDF
Article Synopsis
  • Researchers created a single-particle electrochemical setup to analyze how individual particles affect overall electrode performance.
  • The study reveals that carbon coating improves the exchange current density (i) of LiNi Mn Co O particles and that both solid-phase diffusion coefficient (D) and i drop significantly when charge voltage increases.
  • The findings suggest that particles with higher i values lead to better capacity and quicker capacity fade in porous electrodes, providing a new method to link particle-level properties to electrode performance.
View Article and Find Full Text PDF

The ionic conductivity of composite solid-state electrolytes (SSEs) can be tuned by introducing inorganic fillers, of which the mechanism remains elusive. Herein, ion conductivity of composite SSEs is characterized in an unprecedentedly wide frequency range of 10 -10  Hz by combining chronoamperometry, electrochemical impedance spectrum, and dielectric spectrum. Using this method, it is unraveled that how the volume fraction v and surface fluorine content x of TiO fillers tune the ionic conductivity of composite SSEs.

View Article and Find Full Text PDF

Aluminum-sulfur (Al-S) batteries of ultrahigh energy-to-price ratios are a promising energy storage technology, while they suffer from a large voltage gap and short lifespan. Herein, we propose an electrocatalyst-boosting quasi-solid-state Al-S battery, which involves a sulfur-anchored cobalt/nitrogen co-doped graphene (S@CoNG) positive electrode and an ionic-liquid-impregnated metal-organic framework (IL@MOF) electrolyte. The Co-N sites in CoNG continuously catalyze the breaking of Al-Cl and S-S bonds and accelerate the sulfur conversion, endowing the Al-S battery with a shortened voltage gap of 0.

View Article and Find Full Text PDF

Mechanical properties such as density and Young's modulus of lithium-ion battery electrodes are related to the state of charge (SOC). Characterizing the battery SOC by means of ultrasonic non-destructive testing can obtain the relationship between wave propagation information and the SOC. During the battery charging process, the Young's modulus and density of the internal electrode material will change, which will affect the propagation of ultrasonic waves in the battery.

View Article and Find Full Text PDF

High-temperature electrochemistry is widely used in many fields. However, real-time observations and an in-depth understanding of the inside evolution of this system from an experimental perspective remain limited because of harsh reaction conditions and multiphysics fields. Here, we tackled this challenge with a high-temperature electrolysis facility developed in-house.

View Article and Find Full Text PDF

Nonaqueous rechargeable aluminum batteries (RABs) of low cost and high safety are promising for next-generation energy storage. With the presence of ionic liquid (IL) electrolytes, their high moisture sensitivity and poor stability would lead to critical issues in liquid RABs, including undesirable gas production, irreversible activity loss, and an unstable electrode interface, undermining the operation stability. To address such issues, herein, a stable quasi-solid-state electrolyte is developed via encapsulating a small amount of an IL into a metal-organic framework, which not only protects the IL from moisture, but creates sufficient ionic transport network between the active materials and the electrolyte.

View Article and Find Full Text PDF

In this Letter, a metasurface combined with emerging 3D printing technology is proposed. The proposed metasurface regards the simple cube as the unit cell, and the height of the cube is the only variable. A nearly linear transmission phase range covering 360° operating at 20 GHz is obtained when the height is regulated in [2.

View Article and Find Full Text PDF

Electrodeposition is a fundamental technology in modern society and has been widely used in metal plating and extraction, etc. However, extreme reaction conditions, including wide operation temperature ranges and corrosive media (molten salt/oxide systems as a particular example), inhibit direct in situ observation of the electrodeposition process. To visualize the electrode kinetics in such "black box," X-ray tomography is employed to monitor the electrochemical processes and three-dimensional (3D) evolution of morphology.

View Article and Find Full Text PDF