A5006839795- Advancements in Battery Materials
- Advanced Battery Technologies Research
- Advanced Battery Materials and Technologies
- Extraction and Separation Processes
- Electron and X-Ray Spectroscopy Techniques
- Electrocatalysts for Energy Conversion
- Electrodeposition and Electroless Coatings
- Supercapacitor Materials and Fabrication
- Electrical and Bioimpedance Tomography
- Semiconductor materials and devices
- Recycling and Waste Management Techniques
- Catalysis for Biomass Conversion
- Advancements in Solid Oxide Fuel Cells
- Microfluidic and Bio-sensing Technologies
- Electric Vehicles and Infrastructure
- Semiconductor materials and interfaces
- Green IT and Sustainability
- Energy Harvesting in Wireless Networks
- solar cell performance optimization
- Electrochemical Analysis and Applications
- High-Temperature Coating Behaviors
- Ammonia Synthesis and Nitrogen Reduction
- Non-Destructive Testing Techniques
- Graphene research and applications
- VLSI and Analog Circuit Testing
University of Warwick
2015-2024
The Faraday Institution
2021-2023
Coventry (United Kingdom)
2016-2018
Culham Science Centre
2005
Ricardo AEA (United Kingdom)
2001-2005
Research Complex at Harwell
1990
University of Southampton
1987
Commercial lithium ion cells are now optimised for either high energy density or power density. There is a trade off in cell design between the and requirements. A tear down protocol has been developed, to investigate internal components engineering of nine cylindrical cells, with different power–energy ratios. The designed applications used smaller particles active material both anodes cathodes. cathodes had higher porosities, but similar trend was not observed anodes. In terms design, coat...
Commercial Li-ion batteries are typically cycled between 3.0 and 4.2 V. These voltages limits chosen based on the characteristics of cathode (e.g. lithium cobalt oxide) anode graphite). When alternative anode/cathode chemistries studied same cut-off often, mistakenly, used. Silicon (Si) anodes widely as a high capacity to graphite for Lithium-ion batteries. silicon-based paired with cathodes Lithium Nickel Cobalt Aluminium Oxide; NCA) cell suffers from rapid fade. The purpose this...
Commercial lithium ion cells with different power: energy ratios were disassembled, to allow the electrochemical performance of their electrodes be evaluated. Tests on coin cell half included rate tests (continuous and pulsed), resistance measurements, extended pulse tests. Pulse power at high rates typically showed three limiting processes within a 10 s pulse; an instantaneous increase, solid state diffusion limited stage, then electrolyte depletion/saturation. On anodes, third process can...
Battery manufacturing plays a direct and pivotal role in determining battery performance, which, turn, significantly affects the applications of battery-related energy storage systems. As complicated process that involves chemical, mechanical electrical operations, effective property predictions reliable analysis strongly-coupled parameters or variables become key but challenging issues for wider applications. In this paper, an interpretable machine learning framework could effectively...
Abstract Growth in the Li-ion battery market continues to accelerate, driven primarily by increasing need for economic energy storage electric vehicles. Electrode manufacture slurry casting is first main step cell production but much of manufacturing optimisation based on trial and error, know-how individual expertise. Advancing science that underpins electrode critical adding value chain. Overcoming current barriers requires advances materials, technology, in-line process metrology data...
Abstract Lithium iron phosphate, LiFePO 4 (LFP) has demonstrated promising performance as a cathode material in lithium ion batteries (LIBs), by overcoming the rate issues from limited electronic conductivity. Nano-sized vanadium-doped LFP (V-LFP) was synthesized using continuous hydrothermal process supercritical water reagent. The atomic % of dopant determined particle shape. 5 at. gave mixed plate and rod-like morphology, showing optimal electrochemical good properties vs. Li. Specific...
Li-ion battery is one of the key players in energy storage technology empowering electrified and clean transportation systems. However, it still associated with high costs due to expensive material as well fluctuations manufacturing process. Complicated production processes involving mechanical, chemical, electrical operations makes predictability process a challenge, hence optimised through trial error rather systematic simulation. To establish an in-depth understanding interconnected...
Silicon-Few Layer Graphene (Si-FLG) composite electrodes are investigated using a scalable electrode manufacturing method. A comprehensive study on the electrochemical performance and impedance response is measured spectroscopy. The demonstrates that incorporation of few-layer graphene (FLG) results in significant improvement terms cyclability, resistance diffusion properties. Additionally, responses occur during phase changes silicon elucidated through Staircase Potentio Electrochemical...
Calendering is a key yet complex manufacturing process that has varied effects on the Li-ion battery cell performance. Finding optimal compaction can require many experiments if using traditional one-factor-at-a-time method, which would be both and resource intensive. Design of Experiments (DoE) coupled with modeling via multiple linear regression (MLR) are used in this study to better understand electrode calendering. The factors studied report rolling temperature, post-calendered porosity,...
Long term ageing experimental results show that degradation resulting from coupled DC and AC current waveforms lead to additional of lithium-ion batteries above experienced through pure cycling. More profoundly, such experiments a dependency battery on the frequency perturbation. This paper addresses underlying causality this dependent degradation. Cell autopsy techniques, namely X-ray photoelectron spectroscopy (XPS) negative electrode surface film, growth film components with...
To investigate the influence of cell formats during a development programme, lithium-ion cells have been prepared in three different formats. Coin cells, single layer pouch and stacked gave range scales almost orders magnitude. The used same electrode coatings, electrolyte separator. performance was compared long term cycling tests measurements resistance discharge capacities at rates. Some test results were common to all However, had higher During tests, there indications differences...
The electrode formulation has a significant effect on the performance of lithium ion cells. active material, binder, and conductive carbon all have different roles, finding optimum composition can be difficult using an iterative approach. In this study, design experiment (DoE) methodology is applied to optimisation cathode based iron phosphate (LFP). minimum LFP content in electrodes 94 wt%. Seventeen mixes are used evaluate adhesion, resistivity, electrochemical performance. coating...
Abstract The effect of coating parameters NMC622 cathodes and graphite anodes on their physical structure half-cell electrochemical performance is evaluated by design experiments. Coating include the coater comma bar gap, ratio web speed. properties studied are gravimetric volumetric capacity, rate performance, areal specific impedance (ASI) C-rate. Differences in manufacturing effects electrode observed between electrodes modelled linear regression. cell weight porosity half-coin also...
Abstract Solid-state lithium metal batteries show substantial promise for overcoming theoretical limitations of Li-ion to enable gravimetric and volumetric energy densities upwards 500 Wh kg −1 1,000 l , respectively. While zero-lithium-excess configurations are particularly attractive, inhomogeneous plating on charge results in active loss a subsequent coulombic efficiency penalty. Excess is therefore currently needed; however, this negatively impacts density thus limiting its thickness...
Hybrid anode materials consisting of micro-sized silicon (Si) particles interconnected with few-layer graphene (FLG) nanoplatelets and sodium-neutralized poly(acrylic acid) as a binder were evaluated for Li-ion batteries. The hybrid film has demonstrated reversible discharge capacity ∼1800 mA h g-1 retention 97% after 200 cycles. superior electrochemical properties the anodes are attributed to durable, hierarchical conductive network formed between Si multi-scale carbon additives, enhanced...
This work studies the impact of ratio between areal capacity Graphite anode to NMC622 cathode for Lithium-ion batteries compared electrode characteristics thickness, mass loading and capacity, on their electrochemical properties. The influence factors energy gravimetric at various Crates starting from C/20 up 10C is quantified by combining experiments obtained via design experiment techniques, machine learning modelling explanation techniques. results highlight that performance all highly...
Abstract The formation process and subsequent conditioning (cell ageing) protocols for a commercial EV lithium‐ion cell chemistry have been studied to understand their effect on the electrochemical performance chemical interface. temperature duration were varied both steps, state of charge was investigated step. optimum shown be dependent previous conditions. After at room temperature, longer cycle life observed when performed 5 °C. °C, 45 °C gave best life. These results show that is...
This work introduces a new method for inserting Lithium reference electrode into commercially available 18650-type cells in order to obtain potentials during cell operation. The proposed is simple and requires limited equipment. Furthermore, electrical performance significantly better the capacity resistance can be recorded longer durations when compared some of previously used methods. Electrical this third characterized 18650 with no inserted. retention modified more than 98% first 20...
Abstract While silicon-based negative electrode materials have been extensively studied, to develop high capacity lithium-ion batteries (LIBs), implementing a large-scale production method that can be easily transferred industry, has crucial challenge. Here, scalable wet-jet milling was developed prepare silicon-graphene hybrid material used as in LIBs. This synthesized composite, when an anode lithium cells, demonstrated Li ion storage capacity, long cycling stability and high-rate...
Determining the calendering process variables during electrode manufacturing is critical to guarantee lithium‐ion battery cell's performance; however, it challenging due strong and unknown interdependencies. Herein, explainable machine learning (ML) techniques are used uncover impact of on cells’ performance in terms impedance capacity fade. The study based experimental data from pilot‐scale line considering factors gap, temperature, electrodes’ coating weight, target porosity. It offers a...