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Batteries 2016, 2(4), 35; doi:10.3390/batteries2040035

Effect of Porosity on the Thick Electrodes for High Energy Density Lithium Ion Batteries for Stationary Applications

1,* , 2,†
and
1,3,†
1
Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
2
Project Competence-E, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
3
Helmholtz Institute Ulm for Electrochemical Energy Storage (HIU), Albert-Einstein-Allee 11, 89081 Ulm, Germany
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Maciej Swierczynski
Received: 21 September 2016 / Revised: 23 October 2016 / Accepted: 11 November 2016 / Published: 22 November 2016
(This article belongs to the Special Issue Lithium Ion Batteries)
View Full-Text   |   Download PDF [4241 KB, uploaded 22 November 2016]   |  

Abstract

A series of 250–350 μ m-thick single-sided lithium ion cell graphite anodes and lithium nickel manganese cobalt oxide (NMC) cathodes with constant area weight, but varying porosity were prepared. Over this wide thickness range, micron-sized carbon fibers were used to stabilize the electrode structure and to improve electrode kinetics. By choosing the proper porosities for the anode and cathode, kinetic limitations and aging losses during cell cycling could be minimized and energy density improved. The cell (C38%-A48%) exhibits the highest energy density, 441 Wh/L at the C/10 rate, upon cycling at elevated temperature and different C-rates. The cell (C38%-A48%) showed 9% higher gravimetric energy density at C/10 in comparison to the cell with as-coated electrodes. View Full-Text
Keywords: lithium ion battery; thick electrodes; porosity; carbon fibers lithium ion battery; thick electrodes; porosity; carbon fibers
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Singh, M.; Kaiser, J.; Hahn, H. Effect of Porosity on the Thick Electrodes for High Energy Density Lithium Ion Batteries for Stationary Applications. Batteries 2016, 2, 35.

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