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Influence of the Electrolyte Salt Concentration on the Rate Capability of Ultra‐Thick NCM 622 Electrodes

Kremer, Lea and Danner, Timo and Hein, Simon and Hoffmann, Alice and Prifling, Benedikt and Schmidt, Volker and Latz, Arnulf and Wohlfahrt-Mehrens, Marget (2020) Influence of the Electrolyte Salt Concentration on the Rate Capability of Ultra‐Thick NCM 622 Electrodes. Batteries, 3 (11), pp. 1172-1182. MDPI (Multidisciplinary Digital Publishing Institute). doi: 10.1002/batt.202000098. ISSN 2313-0105.

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Official URL: https://chemistry-europe.onlinelibrary.wiley.com/doi/full/10.1002/batt.202000098


In traditional Li‐ion batteries, the electrolyte consists of a Li‐conducting salt dissolved in organic solvents at a concentration of 1 mol L−1 (1 M). In this work, we use increased LiPF6 concentrations between 1 and 2.3 M to investigate the influence of the electrolyte salt concentration on the rate capability of ultra‐thick (49.5 mg cm−2) and thin (5.6 mg cm−2) NCM 622 electrodes, respectively. At higher electrolyte salt concentrations than 1 M, thin electrodes suffer from increased polarization, due to a higher viscosity and a reduced ionic conductivity. In contrast, by raising the salt concentration from 1 to 1.9 M the discharge capacity of ultra‐thick electrodes is increased by more than 50 % for current densities above 3 mA cm−2, which significantly improves their rate capability. 3D microstructure resolved simulations revealed that this effect results from the mitigation of Li‐ion depletion in the electrolyte filled pore space of ultra‐thick electrodes.

Item URL in elib:https://elib.dlr.de/139588/
Document Type:Article
Title:Influence of the Electrolyte Salt Concentration on the Rate Capability of Ultra‐Thick NCM 622 Electrodes
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kremer, LeaZSW Ulmhttps://orcid.org/0000-0002-2411-3785
Danner, TimoTimo.Danner (at) dlr.dehttps://orcid.org/0000-0003-2336-6059
Hein, SimonSimon.Hein (at) dlr.dehttps://orcid.org/0000-0002-6728-9983
Prifling, BenediktUniversity of Ulmhttps://orcid.org/0000-0002-2952-0208
Schmidt, VolkerUniversity of UlmUNSPECIFIED
Latz, ArnulfArnulf.Latz (at) dlr.dehttps://orcid.org/0000-0003-1449-8172
Wohlfahrt-Mehrens, MargetZSWhttps://orcid.org/0000-0002-5118-5215
Date:7 July 2020
Journal or Publication Title:Batteries
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.1002/batt.202000098
Page Range:pp. 1172-1182
Publisher:MDPI (Multidisciplinary Digital Publishing Institute)
Keywords:high-energy Li-ion battery; concentrated electrolyte; Li-ion concentration gradient; ultra-thick NCM 622 electrode; 3D-microstructure modelling and simulation
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrochemical Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Prcesses (Batteries) (old)
Location: Ulm
Institutes and Institutions:Institute of Engineering Thermodynamics > Computational Electrochemistry
Deposited By: Danner, Timo
Deposited On:16 Dec 2020 21:03
Last Modified:22 Dec 2020 12:34

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