A5040210986- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced Battery Technologies Research
- Supercapacitor Materials and Fabrication
- Diamond and Carbon-based Materials Research
- Semiconductor materials and devices
- Metal and Thin Film Mechanics
- Semiconductor materials and interfaces
- Extraction and Separation Processes
- Graphene research and applications
- Advanced materials and composites
- Force Microscopy Techniques and Applications
- Nonlinear Optical Materials Studies
- Fuel Cells and Related Materials
- Chalcogenide Semiconductor Thin Films
- Advanced battery technologies research
- Advanced Fiber Laser Technologies
- High-pressure geophysics and materials
- Lubricants and Their Additives
- Recycling and Waste Management Techniques
- MXene and MAX Phase Materials
- Adhesion, Friction, and Surface Interactions
- Conducting polymers and applications
- Polymer composites and self-healing
- Anodic Oxide Films and Nanostructures
General Motors (United States)
2015-2024
General Motors (Poland)
2013-2023
Materials Systems (United States)
2013-2022
Central South University
2021-2022
University of Kentucky
2022
Harley-Davidson (United States)
2019
Chinese University of Hong Kong
2016-2018
University of Waterloo
2015
Brown University
2006-2010
Argonne National Laboratory
2003-2007
Abstract Porous structured silicon has been regarded as a promising candidate to overcome pulverization of silicon-based anodes. However, poor mechanical strength these porous particles limited their volumetric energy density towards practical applications. Here we design and synthesize hierarchical carbon-nanotube@silicon@carbon microspheres with both high porosity extraordinary (>200 MPa) low apparent particle expansion ~40% upon full lithiation. The composite electrodes...
The solid electrolyte interphase (SEI), a passivation layer formed on electrodes, is critical to battery performance and durability. inorganic components in SEI, including lithium carbonate (Li2CO3) fluoride (LiF), provide both mechanical chemical protection, meanwhile control ion transport. Although Li2CO3 LiF have relatively low ionic conductivity, we found, surprisingly, that the contact between can promote space charge accumulation along their interfaces, which generates higher carrier...
The dilemma of employing high-capacity battery materials and maintaining the electronic mechanical integrity electrodes demands novel designs binder systems. Here, we developed a polymer with multifunctionality to maintain high conductivity, adhesion, ductility, electrolyte uptake. These critical properties are achieved by designing polymers proper functional groups. Through synthesis, spectroscopy, simulation, conductivity is optimized tailoring key state, which not disturbed further...
To better confine the sulfur/polysulfides in electrode of lithium-sulfur (Li/S) batteries and improve cycling stability, we developed a double-layered core-shell structure polymer-coated carbon-sulfur. Carbon-sulfur was first prepared through impregnation sulfur into hollow carbon spheres under heat treatment, followed by coating polymerization to give structure. From study scanning transmission electron microscopy (STEM) images, demonstrated that not only successfully penetrated porous...
Since the first report of using micromechanical cleavage method to produce graphene sheets in 2004, graphene/graphene‐based nanocomposites have attracted wide attention both for fundamental aspects as well applications advanced energy storage and conversion systems. In comparison other materials, graphene‐based nanostructured materials unique 2D structure, high electronic mobility, exceptional thermal conductivities, excellent optical transmittance, good mechanical strength, ultrahigh...
The unique TiO2-C/MnO2 core-double-shell nanowires are synthesized for the first time using as anode materials lithium ion batteries (LIBs). They combine both advantages from TiO2 such excellent cycle stability and MnO2 with high capacity (1230 mA h g(-1)). additional C interlayer intends to improve electrical conductivity. self-supported nanowire arrays grown directly on current-collecting substrates greatly simplify fabrication processing of electrodes without applying binder conductive...
Three types of nitrogen-doped hollow carbon spheres with different pore sized porous shells are prepared to investigate the performance sulfur confinement. The reason that why no is observed in previous research determined and it successfully demonstrated sulfur/polysulfide will overflow during lithiation process. As a service our authors readers, this journal provides supporting information supplied by authors. Such materials peer reviewed may be re-organized for online delivery, but not...
Free-standing layer-by-layer assembled hybrid graphene-MnO2 nanotube (NT) thin films were prepared by an ultrafiltration technique and studied as anodes for lithium ion batteries. Each layer of graphene provides not only conductive pathways accelerating a conversion reaction MnO2 but also buffer layers to maintain electrical contact with NT during insertion/extraction. In addition, the unique structures film provide porous that enhance Li diffusion into structure. The anode present excellent...
It is well-known that upon lithiation, both crystalline and amorphous Si transform to an armorphous Li(x)Si phase, which subsequently crystallizes a (Li, Si) compound, either Li(15)Si(4) or Li(22)Si(5). Presently, the detailed atomistic mechanism of this phase transformation degradation process in nanostructured are not fully understood. Here, we report characteristic microstructural evolution specially designed silicon (a-Si) coated carbon nanofiber (CNF) composite during charge/discharge...
Ultrathin oxide coatings are demonstrated to offer multiple functions for improving the cycling performance of lithium ion batteries. The can serve as an artificial solid electrolyte interphase layer, which significantly suppresses decomposition well mitigates mechanical degradation. Structure modification is critical increasing conductivity, and therefore leads improved current efficiency.
Abstract Silicon has been identified as a highly promising anode for next-generation lithium-ion batteries (LIBs). The key challenge Si anodes is large volume change during the lithiation/delithiation cycle that results in chemomechanical degradation and subsequent rapid capacity fading. Here we report novel fabrication method hierarchically porous nanospheres (hp-SiNSs), which consist of shell hollow core. On charge/discharge cycling, hp-SiNSs accommodate through reversible inward Li...
Silicon alloys have the highest specific capacity when used as anode material for lithium-ion batteries; however, drastic volume change inherent in their use causes formidable challenges toward achieving stable cycling performance. Large quantities of binders and conductive additives are typically necessary to maintain good cell In this report, only 2% (by weight) functional polymer binder without any was successfully with a micron-size silicon monoxide (SiO) material, demonstrating high...
Abstract Silicon has the potential to revolutionize energy storage capacities of lithium-ion batteries meet ever increasing power demands next generation technologies. To avoid operational stability problems silicon-based anodes, we propose synergistic physicochemical alteration electrode structures during their design. This capitalizes on covalent interaction Si nanoparticles with sulfur-doped graphene and cyclized polyacrylonitrile provide a robust nanoarchitecture. hierarchical structure...
Bilayer polymers that consist of two epoxy dual-shape memory well-separated glass transition temperatures have been synthesized. These bilayer samples exhibit a triple-shape effect (TSME) with shape fixities tailorable by changing the ratio between layers. The can be explained balance stress Based on this work, it is believed following three molecular design criterions should considered in designing optimum TSME: 1) thermal transitions, 2) strong interface, and 3) an appropriate moduli...
Ultrananocrystalline diamond (UNCD) films were prepared by microwave plasma chemical vapor deposition using argon-rich Ar∕CH4 plasmas at substrate temperatures from ∼400 to 800°C. Different seeding processes employed enhance the initial nucleation density for UNCD growth about 1011sites∕cm2. High-resolution transmission electron microscopy, near-edge x-ray absorption fine structure, visible and ultraviolet Raman spectroscopy, scanning microscopy used study bonding structure as a function of...
Most MEMS devices are currently based on silicon because of the available surface machining technology. However, Si has poor mechanical and tribological properties which makes it difficult to produce high performance that could work reliably, particularly in harsh environments; diamond, as a superhard material with strength, exceptional chemical inertness, outstanding thermal stability superior performance, be an ideal for MEMS. A key challenge diamond is integration films other materials....
Silicon (Si) is one of the most promising candidates to replace graphite anodes in next generation Li ion batteries.
We report here a simple and scalable process to fabricate graphene shape memory polymer composites. The material was nanolayered synthesized by microwave plasma enhanced chemical vapor deposition method. free standing graphene, in its pristine state, used as filler epoxy based composites (1) direct dispersion the diamine curing agent; (2) thermal with diepoxides. properties of matrix impart healing capability into composites, which greatly at ultra-low contents 0.0025 0.0125 vol%.
Si is an attractive negative electrode material for lithium ion batteries due to its high specific capacity (≈3600 mAh g –1 ). However, the huge volume swelling and shrinking during cycling, which mimics a breathing effect at material/electrode/cell level, leads several coupled issues including fracture of particles, unstable solid electrolyte interphase, low Coulombic efficiency. In this work, regulation reported by using Si–C yolk–shell nanocomposite has been well‐developed other...