Effects of charging rates on LiNi0.6Mn0.2Co0.2O2 (NMC622)/graphite Li-ion cells
Abstract
Enabling fast charging capability of lithium-ion battery is of great importance to widespread adoption of electric vehicles. Increasing the charging rates from state-of-the-art 2C (30 min) to 6C (10 min) requires deep understanding on the cell aging mechanism. Here, 400 mAh pouch cells are cycled at 1C, 4C and 6C charging rates with 1C discharging rate. Capacity fading, cathode structural changes, Li inventory loss, electrolyte composition changes and Li plating on graphite electrodes are thoroughly studied by various characterization techniques. The rapid capacity fading in cells at 6C charging rate is mainly due to Li inventory loss from cathode structure and metallic Li plating on graphite electrode at higher charging rate. Post-mortem analysis also revealed changes in electrolyte such as increased salt molarity and transesterification during fast charging.
- Authors:
-
[2];
[2];
[3];
[2]
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Energy and Transportation Science Division; Purdue Univ., West Lafayette, IN (United States). School of Mechanical Engineering
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Energy and Transportation Science Division
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
- Purdue Univ., West Lafayette, IN (United States). School of Mechanical Engineering
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office; USDOE
- OSTI Identifier:
- 1659609
- Alternate Identifier(s):
- OSTI ID: 1811139
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Energy Chemistry
- Additional Journal Information:
- Journal Volume: 56; Journal ID: ISSN 2095-4956
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; fast charging; Li-ion cells; neutron powder diffraction; post-test analysis
Citation Formats
Wu, Xianyang, Bai, Yaocai, Li, Zhenglong, Liu, Jue, Zhao, Kejie, and Du, Zhijia. Effects of charging rates on LiNi0.6Mn0.2Co0.2O2 (NMC622)/graphite Li-ion cells. United States: N. p., 2020.
Web. doi:10.1016/j.jechem.2020.08.008.
Wu, Xianyang, Bai, Yaocai, Li, Zhenglong, Liu, Jue, Zhao, Kejie, & Du, Zhijia. Effects of charging rates on LiNi0.6Mn0.2Co0.2O2 (NMC622)/graphite Li-ion cells. United States. https://doi.org/10.1016/j.jechem.2020.08.008
Wu, Xianyang, Bai, Yaocai, Li, Zhenglong, Liu, Jue, Zhao, Kejie, and Du, Zhijia. Mon .
"Effects of charging rates on LiNi0.6Mn0.2Co0.2O2 (NMC622)/graphite Li-ion cells". United States. https://doi.org/10.1016/j.jechem.2020.08.008. https://www.osti.gov/servlets/purl/1659609.
@article{osti_1659609,
title = {Effects of charging rates on LiNi0.6Mn0.2Co0.2O2 (NMC622)/graphite Li-ion cells},
author = {Wu, Xianyang and Bai, Yaocai and Li, Zhenglong and Liu, Jue and Zhao, Kejie and Du, Zhijia},
abstractNote = {Enabling fast charging capability of lithium-ion battery is of great importance to widespread adoption of electric vehicles. Increasing the charging rates from state-of-the-art 2C (30 min) to 6C (10 min) requires deep understanding on the cell aging mechanism. Here, 400 mAh pouch cells are cycled at 1C, 4C and 6C charging rates with 1C discharging rate. Capacity fading, cathode structural changes, Li inventory loss, electrolyte composition changes and Li plating on graphite electrodes are thoroughly studied by various characterization techniques. The rapid capacity fading in cells at 6C charging rate is mainly due to Li inventory loss from cathode structure and metallic Li plating on graphite electrode at higher charging rate. Post-mortem analysis also revealed changes in electrolyte such as increased salt molarity and transesterification during fast charging.},
doi = {10.1016/j.jechem.2020.08.008},
journal = {Journal of Energy Chemistry},
number = ,
volume = 56,
place = {United States},
year = {Mon Aug 17 00:00:00 EDT 2020},
month = {Mon Aug 17 00:00:00 EDT 2020}
}
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