Univ. Grenoble Alpes, Saint Martin d'Hères, France, CEA, LITEN, Grenoble, France, CEA, LETI, Grenoble, France

Major advances in Li-ion battery technology rely on the nanostructuration of active materials to overcome the severe kinetics limitations of new – cheaper and safer – chemistries. However, opening porosities results in the decrease of volumetric performances, closing the door to significant applications such as portable electronics, electromobility, and grid storage. In this study, we analyze the link between morphologies and performances of model LiNi1/3Mn1/3Co1/3O2materials. By quantifying exhaustively their microstructures using nitrogen adsorption, mercury intrusion porosimetry, and helium pycnometry, we can discuss how porosities and surface areas are linked to the electrochemical behavior. There is no geometrical parameters that can predict the performances of all our materials. The shape of agglomeration dictates the electrochemical behavior. A huge drop in volumetric performances is measured when microstructure is considered. We show that gravimetric and volumetric power performances are contrary to each other. Highly dense materials exhibit, by far, the best power performances in terms of volumetric figures, so that opening porosities might not be the best strategy, even in non-nanosized materials, for Li-ion battery technology. © 2017 Elsevier B.V.

Coprecipitation, Layered oxide, Lithium batteries, Spherical particles, Volumetric energy density

Coprecipitation, Electric batteries, Gas adsorption, Geometry, Ions, Lithium, Lithium alloys, Lithium batteries, Lithium compounds, Manganese, Mercury (metal), Microstructure, Porosity, Electrochemical behaviors, Layered oxides, Mercury intrusion porosimetry, Morphological changes, Nanosized materials, Portable electronics, Spherical particle, Volumetric energy densities, Lithium-ion batteries