Praveen Kumar
University of Grenoble
21 Papers
34 Citations
Praveen Kumar is an academic researcher from University of Grenoble. The author has contributed to research in topics: Contact resistance & Microstructure. The author has an hindex of 11, co-authored 21 publications. Previous affiliations of Praveen Kumar include Commissariat à l'énergie atomique et aux énergies alternatives & University of Tübingen.
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Papers
A Scalable Silicon Nanowires-Grown-On-Graphite Composite for High-Energy Lithium Batteries.
Saravanan Karuppiah,Caroline Keller,Praveen Kumar,Pierre-Henri Jouneau,Dmitry Aldakov,Jean-Baptiste Ducros,Gérard Lapertot,Pascale Chenevier,Cédric Haon +8 more
TL;DR: This work provides insights into the fruitful engineering of active composites at the nano- and microscales to design efficient Si-rich anodes for lithium-ion batteries.
Multiscale Multiphase Lithiation and Delithiation Mechanisms in a Composite Electrode Unraveled by Simultaneous Operando Small-Angle and Wide-Angle X-Ray Scattering.
Christopher L. Berhaut,Diana Zapata Dominguez,Praveen Kumar,Pierre-Henri Jouneau,Willy Porcher,David Aradilla,Samuel Tardif,Stéphanie Pouget,Sandrine Lyonnard +8 more
TL;DR: The results indicate that, within the composite electrode, the active silicon volume does not increase linearly with lithium insertion and point toward the important role of the electrode morphology to accommodate the nanoscale silicon expansion, an effect that remains beneficial after cell ageing and most probably explains the excellent performance of the composite material.
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Nano‐architectured composite anode enabling long‐term cycling stability for high‐capacity lithium‐ion batteries
Praveen Kumar,Christopher L. Berhaut,Diana Zapata Dominguez,Eric De Vito,Samuel Tardif,Stéphanie Pouget,Sandrine Lyonnard,Pierre-Henri Jouneau +7 more
TL;DR: The root cause of electrode polarization, initial capacity fading, and electrode swelling is discussed and has profound implications for the development of stable lithium-ion batteries.
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Multi-scale quantification and modeling of aged nanostructured silicon-based composite anodes
Thomas Vorauer,Praveen Kumar,Christopher L. Berhaut,Fereshteh Falah Chamasemani,Pierre-Henri Jouneau,David Aradilla,Samuel Tardif,Stéphanie Pouget,Bernd Fuchsbichler,Lukas Helfen,Selcuk Atalay,Widanalage Dhammika Widanage,Stefan Koller,Sandrine Lyonnard,Roland Brunner +14 more
- 16 Oct 2020
TL;DR: In this article, a multi-scale characterization approach is presented to understand the de-lithiation and irreversible volumetric changes of amorphous silicon (a-Si)/crystalline iron-silicide (c-FeSi2) nanoscale phase and its evolution due to cycling, as well as their impact on the proximate pore network.
Contact formation of front side metallization in p-type, single crystalline Si solar cells: Microstructure, temperature dependent series resistance and percolation model
TL;DR: In this article, screen printed front side contacts were investigated in single-crystalline (planar and textured) Si solar cells with n-type emitters, yielding maximum efficiencies of 18.0%.
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