A5084331268- Advancements in Battery Materials
- Advanced Battery Technologies Research
- Advanced Battery Materials and Technologies
- Supercapacitor Materials and Fabrication
- Advanced battery technologies research
- Conducting polymers and applications
- Electrocatalysts for Energy Conversion
- Reliability and Maintenance Optimization
- Fuel Cells and Related Materials
- Fault Detection and Control Systems
- Chalcogenide Semiconductor Thin Films
- Chemical Synthesis and Characterization
University of California, San Diego
2023-2025
Columbia University
2019-2023
Shanghai Jiao Tong University
2016-2019
Abstract The ever‐growing needs for renewable energy demand the pursuit of batteries with higher energy/power output. A thick electrode design is considered as a promising solution high‐energy due to minimized inactive material ratio at device level. Most current research focuses on pushing thickness maximum limit; however, very few them thoroughly analyze effect cell‐level densities well balance between and power density. Here, realistic assessment combined other key parameters provided,...
Thick electrodes, although promising toward high-energy battery systems, suffer from restricted lithium-ion transport kinetics due to prolonged diffusion lengths and tortuous pathways. Despite the emerging low-tortuosity designs, capacity retention under higher current densities is still limited. Herein, we employ a modified ice-templating method fabricate porous electrodes with tunable wall thickness channel width systematically investigate critical impacts of fine structural parameters on...
Because it has been demonstrated to be effective toward faster ion diffusion inside the pore space, low-tortuosity porous architecture become focus in thick electrode designs, and other possibilities are rarely investigated. To advance current understanding structure-affected electrochemistry broaden horizons for we present a gradient design, where channels vertically aligned with smaller openings on one end larger other. With its 3D morphology carefully visualized by Raman mapping,...
ConspectusThe demand for lithium ion batteries continues to expand powering applications such as portable electronics, grid-scale energy storage, and electric vehicles. As the application requirements advance, innovation of toward higher density power output is required. Along with investigation new materials, an important strategy increasing battery content design electrodes high areal loading minimize fraction nonactive materials current collectors, separators, packaging components,...
Abstract Structural batteries are attractive for weight reduction in vehicles, such as cars and airplanes, which requires to have both excellent mechanical properties electrochemical performance. This work develops a scalable feasible tree‐root‐like lamination at the electrode/separator interface, effectively transfers load between different layers of battery components thus dramatically enhances flexural modulus pouch cells from 0.28 3.1 GPa. The underlying mechanism is also analyzed by...
Abstract Construction of metal oxide nanoparticles as anodes is special interest for next-generation lithium-ion batteries. The main challenge lies in their rapid capacity fading caused by the structural degradation and instability solid-electrolyte interphase (SEI) layer during charge/discharge process. Herein, we address these problems constructing a novel-structured SnO 2 -based anode. novel structure consists mesoporous clusters quantum dots (SnO QDs), which are wrapped with reduced...
3D holey-graphene networks were constructed with a generalized <italic>ex situ</italic> method for various electroactive nanoparticles to expedite Li<sup>+</sup>/electron migration.
The future application of Li metal batteries (LMBs) at scale demands electrolytes that endow improved performance under fast-charging and low-temperature operating conditions. Recent works indicate desolvation kinetics + plays a crucial role in enabling such behavior. However, the modulation this process has typically been achieved through inducing qualitative degrees ion pairing into system. In work, we find more quantitative control is to minimizing penalty electrified interface thus...
Rechargeable metallic lithium batteries are considered as promising candidates for next-generation energy storage due to their high densities. However, safety concerns associated with electrolyte flammability and dendrite growth hinder practical applications. Nonflammable liquid electrolytes have attracted significant attention recently, but they mainly based on expensive ionic liquids, fluorinated solvents, or highly concentrated salt. Here we design a novel trisalt composed of...
Abstract In lithium metal batteries, non‐uniform stripping of results in pit formation, which promotes subsequent non‐uniform, dendritic deposition. This viscous cycle leads to pulverization cell shorting or capacity degradation, symptoms further exaggerated by high electrode areal loading and lean electrolytes. To address this challenge, a composite anode is engineered that contains uniformly distributed, nanometer‐sized carbon particles. shown strip more since the growth pits intercepted...
Measuring tortuosity in porous electrodes is important for understanding rate capability and optimizing design. Here, we describe an approach to determine electrode tortuosities quantify the associated uncertainties by fitting a P2D model discharge profiles from standard test. A dimensionless current identified as design-of-experiment parameter that can be used identify experiments return confident estimates of tortuosity, even when other parameters are not known with certainty. This applied...
Battery cathodes are complex multiscale, multifunctional materials. The length scale at which the dominant impedance arises may be difficult to determine even with most advanced experimental characterization efforts, and thus modeling can play an important role in analysis. Discharge voltage relaxation curves, interrogated theory, used distinguish between transport that arise on of active crystal agglomerates (secondary particles) comprised nanoscale crystals. Model-selection algorithms...
While deeply charged high-voltage cathodes can improve battery energy density, understanding and preventing any accelerated cell degradation is crucial to practical success. To analyze the of LiNixMnyCo1–x–yO2 (NMC) type material 4.3 4.5 V, a physics-based model applied cycling data obtain parameter estimates indicative modes, which are validated by simple electrochemical measurements further interpreted materials characterization. Growth rates interfacial impedance active loss greater at as...
Advanced electrode architectures utilizing aligned channels show promise in improving rate performance. However, the relationship between channel structure and electrode-scale ion transport must be understood to enable optimization of designs. Using a physics-based P2D model for experimental analysis, impact structures on cell capability is quantified. Results are used aligned-channel volume fraction mass loading. Anticipated improvements volumetric energy density over optimal conventional,...
Unlike Li-ion transport in the bulk of carbonaceous materials, little is known about diffusion on their surface. In this study, we have discovered an ultra-fast phenomenon surface particularly when they limited Li insertion capacity along with a high area. This exemplified by carbon black, Ketjen Black (KB). An ionic conductivity 18.1 mS cm-1 at room temperature observed, far exceeding most solid-state ion conductors. Theoretical calculations reveal low barrier for species. The species also...
Sulfide solid state electrolytes are promising candidates to realize all batteries due their superior ionic conductivity and excellent ductility. However, hypersensitivity moisture requires processing environments that not compatible with todays lithium ion battery manufacturing infrastructure. Herein, we present a reversible surface modification strategy enables the processability of sulfide SSEs under humid ambient air. We demonstrate long chain alkyl thiol, undecanethiol, is chemically...
Rechargeable Li-SO
Lithium-sulfur (Li-S) batteries are recognized as a promising candidate for next-generation energy storage systems due to their high theoretical density and the abundance of sulfur. However, achieving long-cycling Li-S battery with specific capacity more than 300 Wh kg −1 presents several challenges, notably lithium metal pulverization induced by non-uniform stripping leading pit formation subsequent dendritic deposition. This detrimental cycle exacerbates cell shorting degradation,...
Battery research and development efforts necessarily involve large-scale experimental studies where cells are cycled under different conditions. Physics based models (PBM) of the type pioneered by John Newman, Ralph White, others can play a key role in interpreting resulting cycling data, course be used to improve performance modifications cell design optimize for specific application. Long-term that characterize degradation an important experiment estimate useful battery life real-world The...