Effects of charging rates on LiNi0.6Mn0.2Co0.2O2 (NMC622)/graphite Li-ion cells

Wu, Xianyang; Bai, Yaocai; Li, Zhenglong; Liu, Jue; Zhao, Kejie; Du, Zhijia

doi:10.1016/j.jechem.2020.08.008

Effects of charging rates on LiNi_0.6Mn_0.2Co_0.2O₂ (NMC622)/graphite Li-ion cells

Journal Article · Mon Aug 17 00:00:00 EDT 2020 · Journal of Energy Chemistry

DOI:https://doi.org/10.1016/j.jechem.2020.08.008· OSTI ID:1659609

Wu, Xianyang ^[1]; ^[2]; ^[2]; ^[3]; Zhao, Kejie ^[4]; ^[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

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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1659609

Alternate ID(s):: OSTI ID: 1811139

Journal Information:: Journal of Energy Chemistry, Journal Name: Journal of Energy Chemistry Vol. 56; ISSN 2095-4956

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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