A5048926798- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Extraction and Separation Processes
- Supercapacitor Materials and Fabrication
- Fuel Cells and Related Materials
- Advanced Battery Technologies Research
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Membrane-based Ion Separation Techniques
- Chemical Synthesis and Characterization
- Semiconductor materials and devices
- Membrane Separation Technologies
- Advancements in Solid Oxide Fuel Cells
- Transition Metal Oxide Nanomaterials
- Polyoxometalates: Synthesis and Applications
- Conducting polymers and applications
- Electron and X-Ray Spectroscopy Techniques
- Copper-based nanomaterials and applications
- Semiconductor materials and interfaces
- Green IT and Sustainability
- Ferroelectric and Piezoelectric Materials
- Metal-Organic Frameworks: Synthesis and Applications
- Corrosion Behavior and Inhibition
- Recycling and Waste Management Techniques
- Advanced Electron Microscopy Techniques and Applications
Robert Bosch (Netherlands)
2019-2022
Robert Bosch (United States)
2018-2021
National University of Singapore
2008-2021
Sunnyvale Public Library
2019
Lawrence Berkeley National Laboratory
2015-2017
Oak Ridge National Laboratory
2015
Berkeley College
2015
Abstract Sodium ion batteries are attractive for the rapidly emerging large‐scale energy storage market intermittent renewable resources. Currently a viable cathode material does not exist practical non‐aqueous sodium battery applications. Here we disclose high performance, durable electrode based on 3D NASICON framework. Porous Na 3 V 2 (PO 4 ) /C was synthesized using novel solution‐based approach. This material, as cathode, is capable of delivering an capacity ∼400 mWh/g vs. metal....
We report here the electrochemical properties of Na2Ti3O7, a potential non-carbon based, low-voltage anode material for room temperature sodium ion battery applications. A solid-state route was used to prepare Na2Ti3O7. Further, XRD, SEM, TEM, HRTEM, SAED, XPS and EDX techniques were characterize material. The Na/Na2Ti3O7 cell displayed charge capacity 177 mA h g−1 at 0.1 C rate. High rate long term cyclic performance different rates showed relatively stable storage capacities. Surprisingly,...
Micrometre-sized mesoporous materials have characteristic grains as well pores nearly in the same scale. Electrodes of for lithium batteries short transport lengths Li+ ions due to their nano-sized (10–20 nm), and easy access electrolytes nanopores (5–10 nm). Such high packing densities unlike nanopowders, nanowires, nanorods nanotubes. Despite such advantages, electronic conduction over micrometre-sized particles limits rate performance mesporous materials. Occasionally counductive thin...
Lithium iron phosphate, LiFePO4 (LFP), is considered to be a potential cathode material for lithium-ion batteries but its rate performance significantly restricted by sluggish kinetics of electrons and lithium ions. A simple solvothermal method has been described in this article synthesize carbon coated LFP (LFP/C) nanoplates with varying thickness from 20 500 nm using different precursors. The influence solvents on the morphology synthesis also investigated. uniform coverage at surfaces...
The morphology of electrode materials is addressed as a key factor controlling rapid lithium storage in anisotropic systems such LiFePO4. In view this, we have synthesized nanoplates LiFePO4 with uniform coating 5 nm thick amorphous carbon layer by the solvothermal method and investigated their electrochemical behavior. obtained are well characterized XRPD, SEM, HRTEM XPS techniques. thickness along b-axis found to be 30–40 nm; favors short diffusion lengths for Li+ ions, while external...
In this manuscript, a systematic investigation on the electrochemical performance of as-synthesized metal organic framework (MOF) Zn3(HCOO)6 with diamondoid structure for Li storage using conversion reaction at low potential is described. Nearly an invariable capacity 560 mAh g−1 (9.6 moles Li) was obtained up to 60 cycles mA within voltage range 0.005–3.0 V. The regeneration MOF during cycling and improved cyclability are evidenced from results along ex situ PXRD, FTIR TEM studies. suggests...
The ultra-fast (30C or 2 min) rate capability and impressive long cycle life (>5000 cycles) of Na2Ti6O13 are reported. A stable 2.5 V sodium-ion battery full cell is demonstrated. In addition, the sodium storage mechanism thermal stability discussed.
Identifying dual role electrode materials capable of storing both lithium and sodium are thought to be highly relevant, as these could find potential applications simultaneously in ion batteries. In this regard, the concept alkali storage is demonstrated Fe(3)O(4) anode material undergoing conversion reaction. To enable improved storage, a rational active design proposed. Accordingly, following features were incorporated into design: (i) an optimal particle size, (ii) conducting matrix,...
MOP(OF) up the lithium: Metal organic–phosphate open framework materials, for example K2.5[(VO)2(HPO4)1.5(PO4)0.5(C2O4)] (see scheme), are investigated as hybrid cathode materials lithium ion batteries. The redox-active metal center, robustness, available two-dimensional migration pathways in ab plane, and cavities along c axis of alkali ions allow rapid insertion extraction ions. Detailed facts importance to specialist readers published "Supporting Information". Such documents...
Abstract Understanding the reaction pathway and kinetics of solid-state phase transformation is critical in designing advanced electrode materials with better performance stability. Despite first-order transition a large lattice mismatch between involved phases, spinel LiMn 1.5 Ni 0.5 O 4 capable fast rate even at particle size, presenting an enigma yet to be understood. The present study uses two-dimensional three-dimensional nano-tomography on series well-formed Li x Mn (0≤ ≤1) crystals...
Capacity and voltage fading of layered structured cathode based on lithium transition-metal oxide is closely related to the lattice position migration behavior ions. However, it scarcely clear about each these ions in this category material. We report direct atomic resolution visualization interatomic layer mixing transition metals (Ni, Co, Mn) cathodes for lithium-ion batteries. Using chemical imaging with an aberration-corrected scanning transmission electron microscope (STEM) density...
The chemical processes occurring on the surface of cathode materials during battery cycling play a crucial role in determining battery's performance. However, understanding such chemistry is far from clear due to complexity redox charge/discharge. Through intensive aberration corrected STEM investigation ten layered oxide materials, two important findings pristine oxides are reported. First, Ni and Co show strong plane selectivity when building up their respective segregation layers (SSLs)....
Complex chemomechanical interplay exists over a wide range of length scales within the hierarchically structured lithium-ion battery. At mesoscale, interdependent structural complexity and chemical heterogeneity collectively govern local chemistry and, as result, critically influence cell level performance. Here we investigate morphology state charge (SOC) inhomogeneity secondary NCA particles that were cycled in solid polymer batteries. We observe substantial nickel oxidation (a proxy for...
This is a techno-economic analysis of intercalative water deionization (IDI), novel battery-inspired concept for brackish desalination with lower module cost, volume, and energy consumption than competing technologies.
A simple solvothermal method was used to synthesize nanoplates of LiMnPO4 (LMP) with a thickness ∼60 80 nm. The LMP were well characterized by PXRD, SEM and HRTEM techniques. reaction conditions for the found be crucial control morphology LMP. Carbon, silver, gold copper have been coated on surfaces improve electronic conductivity. Despite such coating, electrochemical activity metal-decorated minimal due discontinuous wiring limiting conduction. Therefore, Mn2+ in partially substituted Fe2+...
Surface properties of cathode particles play important roles in the transport ions and electrons they may ultimately dominate cathode's performance stability lithium‐ion batteries. Through use carefully prepared Li 1.2 Ni 0.13 Mn 0.54 Co O 2 crystal samples with six distinct morphologies, surface transition‐metal redox activities structural transformation are investigated as a function area crystalline orientation. Complementary depth‐profiled core‐level spectroscopy, namely, X‐ray...
Abstract The heterogeneity of polymer electrolyte fuel cell catalyst degradation is studied under varied relative humidity and types feed gas. Accelerated stress tests (ASTs) are performed on four membrane electrode assemblies (MEAs) wet dry conditions in an air or nitrogen environment for 30 000 square voltage cycles. largest electrochemically active area loss observed MEA a gas AST due to constant upper potential limit 0.95 V significant water content. mean Pt particle size larger the ASTs...
The structural integrity of layered Ni-rich oxide cathode materials is one the most essential factors that critically affect performance and reliability lithium-ion batteries.
Utilization of a novel two-dimensional coordination polymer generated from trinuclear building block [Cu3(HSser)3(H2O)2]·2H2O (1) as precursor in the synthesis copper sulfide serendipitously resulted CuS nanospheres with hollow interiors. The formation nanocrystals three-dimensional hierarchical flower-like morphology hydrogen-bonded metal complex [Cu(H2Sser)2]·H2O (2) may be understood spatial arrangement atom and organic ligand crystal lattice plays major role determining shape...
Hollow spheres of electroactive α-LiVOPO4 were synthesized via a simple one step solvothermal method. A powder X-ray diffraction study revealed that the obtained product crystallized in triclinic phase. The morphology was largely influenced by reaction conditions such as time, temperature, etc., and easily fine tuned from hollow to hard upon changing time. Without any post-heat treatment or milling with conductive additives, these exhibited comparatively large reversible Li storage 130 61 mA...
Understanding the kinetic implication of solid-solution vs. biphasic reaction pathways is critical for development advanced intercalation electrode materials. Yet this has been a long-standing challenge in materials science due to elusive metastable nature solid solution phases. The present study reports synthesis, isolation and characterization room-temperature LixMn1.5Ni0.5O4 solutions. In situ XRD studies performed on pristine chemically-delithiated, micron-sized single crystals reveal...
A P2-layered oxide using copper as the active redox metal has been discovered. It a composition of Na⅔Cu⅓Mn⅔O2, and can withstand thousand cycles, maintaining 61% its original capacity. We demonstrate that enable not only high voltage, but also excellent stability. This work opens up new avenue design for energy, cost effective battery systems.
Abstract Pt catalysts in polymer electrolyte fuel cells degrade heterogeneously as the catalyst particles are exposed to local variations throughout layer during operation. State‐of‐the‐art analytical techniques for studying degradation of do not possess fine spatial resolution elucidate such non‐uniform behavior at a large electrode level. A new methodology is developed spatially resolve and quantify heterogeneous over area (several cm 2 ) aged MEAs based on synchrotron X‐ray...