A5046685662- Advanced Battery Materials and Technologies
- Advanced Battery Technologies Research
- Advancements in Battery Materials
- Thermal and Kinetic Analysis
- Transition Metal Oxide Nanomaterials
- Extraction and Separation Processes
- Fuel Cells and Related Materials
- Risk and Safety Analysis
- Solid-state spectroscopy and crystallography
- Catalytic Processes in Materials Science
- Polysaccharides and Plant Cell Walls
- Gas Sensing Nanomaterials and Sensors
- Polysaccharides Composition and Applications
- Thermal Expansion and Ionic Conductivity
- Proteins in Food Systems
- Recycling and Waste Management Techniques
- Machine Learning in Materials Science
- Inorganic Chemistry and Materials
- Advanced Thermoelectric Materials and Devices
University of Maryland, College Park
2022-2025
LixCoO2 (LCO) is a common battery cathode material that has recently emerged as promising for other applications including electrocatalysis and electrochemical random access memory (ECRAM). During charge-discharge cycling LCO exhibits phase transformations are significantly complicated by electron correlation. While the bulk diagram an ensemble of particles been studied extensively, it remains unclear how these phases scale to nanometer dimensions effects strain diffusional anisotropy at...
At the earliest stage of battery development, differential scanning calorimetry (DSC) a sample with all cell stack materials can provide quantitative data on reaction thermochemistry. The resulting thermochemical map expected reactions upon heating then guide chemistry and component development toward improved safety. In this work, we construct Li0.43CoO2 + C PVDF|Li6.4La3Zr1.4Ta0.6O12|Li microcell DSC samples capacity-matched electrodes test to 500 °C. Notable observations are: (1) ∼74% O2...
Batteries are the cornerstone of global shift toward electrification, powering applications from passenger transportation, like electric vehicles (EVs), to load shifting renewable energy generation at grid level. The demand for batteries is accelerating, and projected nearly quadruple by 2030. In response increasing battery demands, in particular longer range EVs, higher density specific alternatives conventional Li-ion technologies being researched. However, directly correlates with an...
The use of differential scanning calorimetry (DSC) to measure the thermal behavior individual components and electrolyte/electrode combinations is common. However, here we focus on DSC tests an anode, cathode, electrolyte (ACE) component combination over a temperature range that includes many phase transitions key reactions (i.e., 500 °C) contribute runaway. This method can help quantify complex reaction network in full cell, thereby informing potential safety issues. Here, used heat flow...
The interaction of mechanical and electrochemical effects in the areas thermodynamics, kinetics, transport are known, but accurately measuring those couplings can be complicated by difficulty getting a uniform stress at solid-solid interface where surface roughness, voids inclusion result inhomogeneous contacts. 1 This is particular challenge for solid-state batteries both active material electrolyte solid phase. In addition, cycling metal anodes (e.g., Na Li) results processes such as...
There are numerous “beyond lithium ion” battery chemistries under development at universities, national labs, companies, and other organizations. Early-stage chemistry work typically focuses on demonstrating performance the materials, coin, pouch cell level, with evaluation design for safety left later stages. 1 In this talk, we will describe opportunities assessing of a earliest stages its development, as soon active materials electrolyte have been identified. 2 With carefully designed...
With the growing concern over Li-ion battery safety, particularly with cells that utilize lithium metal anodes, differential scanning calorimetry (DSC) has emerged as a promising technique for safety analysis of prospective chemistries on materials scale. DSC is generally used single materials, cell layers, and combinations layers to assess thermal stability well interactions between materials. Despite common use in literature, there no standardization sample preparation or reporting...
Controlled stress is critical to both fabrication and operation of solid-state batteries ensure pristine, low-impedance interfaces. The effects externally applied stresses on overall cell performance degradation due altered thermodynamics, interfacial kinetics, bulk transport the active species have been studied in several prior works. In addition stack pressure which can vary up 100s MPa, internal localized a few ~1 GPa be generated from volume changes during charge discharge. Electrode...
It is a general understanding that removal of combustible organic solvent with the introduction solid-state electrolytes would make battery safer. However, safety in solid state batteries multifaceted and involves analysis self-heating rates, total generated energy, thermal runaway onset temperature, maximum prevention mechanisms 1,2 . The use reactive lithium metal as anode, cathode material such LiCoO 2 releases O when heated its delithiated state, results conditions which exothermic...
The safety of solid-state battery is multifaceted and requires analysis the thermal runaway onset temperature, total heat released, maximum release rate, amount toxicity any gases other factors 1 . temperature strong self-heating particularly important, hence quantitative exothermic reactions as a function required. We use differential scanning calorimetry to measure flow for cells with Li metal anode, an LLZO separator, both LiCoO2 NMC cathode sheets (which also contain conductive additive...
Research efforts in developing solid-state batteries with lithium metal anode have been on the rise owing to high specific energy density cells using metal. An all battery is often assumed be safer compared a Li-ion an organic liquid electrolyte. If of cell increased through introduction Li metal, potential temperature also increases, leading reduction safety. In particular, during self-heating has react cathode itself and/or oxygen released from upon heating, as well solid The rate and...
The application of a solid-electrolyte may enable the use certain high energy density anodes like Li and Si also circumvents flammable liquid-electrolyte. However, all solid components introduce multiple solid-solid interfaces whose responses are strongly affected by mechanical state region on both sides, which can be combination applied stack pressure cycling induced volumetric change 1 . Electrochemo-mechanical coupling (ECM) studies 2 relatively new area for this society, especially with...
It is commonly assumed that the introduction of solid-state electrolytes implies improved safety high-energy batteries due to removal combustible organic solvents in present Li-ion cells. However, a multifaceted issue involves thermal runaway onset temperature, self-heating rates, total generated energy, maximum gas or other material releases from cell, prevention mechanisms, etc. 1 In addition, use lithium metal anodes (which melt at 180°C) for high energy density cells may introduce...
Using Li and Na metal with a solid electrolyte in high-energy safe batteries for consumer applications is of great interest, but our understanding the behavior this interface, as well expected safety cells built or electrolyte, requires improvement. In talk I will describe (1) work both modeling measuring electrochemical-mechanical coupling at / (2) experimental on state battery safety. The topic focus influence current distribution mechanical loadings metal/solid influence, taking into...