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Title: A Comprehensive Understanding of the Aging Effects of Extreme Fast Charging on High Ni NMC Cathode

Abstract

Extreme fast charging (XFC, =10-15 min charging) is expected to increase the adoption of electric vehicles (EVs), but currently accelerates degradation in Li ion cells. As the battery industry shifts toward high Ni content cathodes, such as LiNi0.8Mn0.1Co0.1O2 [NMC811] -- due to its higher specific capacity, better transport properties, and lower Co content -- a complete understanding of the degradation mechanisms of NMC811 under XFC conditions, and how those compare to lower Ni content cathodes, like LiNi0.5Mn0.3Co0.2O2 [NMC532], is needed. Such comprehensive understanding would identify the most critical materials gaps that need to be addressed for enabling XFC long-life cells for EVs. Using well-defined cells and charging protocols, this study maps out the key aging mechanisms for NMC811 cycled at different XFC conditions [at 1C-9C to 4.1V (~100% state-of-charge [SOC]) and at 9C to 3.63V (~35% SOC), 3.77V (~60% SOC), and 3.94V (~80% SOC)] for up to 1000 cycles. To acquire a fundamental understanding of utilization and degradation, cells were evaluated using a range of electrochemical techniques, and a suite of multimodal and multiscale microscopy techniques to quantify chemical, structural, and crystallographic degradation as a function of cycling conditions for the NMC cathode. When comparing NMC532 to NMC811, it ismore » observed that NMC811 has a greater subsurface crystallographic degradation from layered to rock salt structures and displays a similar magnitude of sub particle cracking. However, the NMC811 maintains superior performance despite those advanced degradations. The superior cycle life performance is attributed to the NMC811 particles having radially oriented grains and improved transport properties. NMC811 showed between 4.6× to 3.15× reduction in capacity fade than NMC532 for charging rates between 4C (e.g., 15-minute charging) and 6C (10-minute charging).« less

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1];  [2];  [2];  [1]; ORCiD logo [3];  [3]; ORCiD logo [1]; ORCiD logo [4]; ORCiD logo [2]; ORCiD logo [2];  [2]
  1. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States)
  3. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States); Idaho National Lab. (INL), Idaho Falls, ID (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office, Advanced Battery Cell Research Program (eXtreme Fast-Charge Cell Evaluation of Lithium-ion batteries [XCEL])
OSTI Identifier:
1867583
Alternate Identifier(s):
OSTI ID: 1871302; OSTI ID: 1878612
Report Number(s):
NREL/JA-5700-81576; INL/JOU-21-64400-Rev000
Journal ID: ISSN 1614-6832; MainId:82349;UUID:a9a5ddf6-3e40-4580-9827-088031702116;MainAdminID:64326
Grant/Contract Number:  
AC36-08GO28308; AC07-05ID14517; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Advanced Energy Materials
Additional Journal Information:
Journal Volume: 12; Journal Issue: 22; Journal ID: ISSN 1614-6832
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; 25 ENERGY STORAGE; cathode; cracking; fast charge; high nickel; Li-ion battery; NMC 811; lithium-ion battery

Citation Formats

Tanim, Tanvir R., Yang, Zhenzhen, Finegan, Donal P., Chinnam, Parameswara R., Lin, Yulin, Weddle, Peter J., Bloom, Ira, Colclasure, Andrew M., Dufek, Eric J., Wen, Jianguo, Tsai, Yifen, Evans, Michael C., Smith, Kandler, Allen, Jeffery M., Dickerson, Charles C., Quinn, Alexander H., Dunlop, Alison R., Trask, Stephen E., and Jansen, Andrew N. A Comprehensive Understanding of the Aging Effects of Extreme Fast Charging on High Ni NMC Cathode. United States: N. p., 2022. Web. doi:10.1002/aenm.202103712.
Tanim, Tanvir R., Yang, Zhenzhen, Finegan, Donal P., Chinnam, Parameswara R., Lin, Yulin, Weddle, Peter J., Bloom, Ira, Colclasure, Andrew M., Dufek, Eric J., Wen, Jianguo, Tsai, Yifen, Evans, Michael C., Smith, Kandler, Allen, Jeffery M., Dickerson, Charles C., Quinn, Alexander H., Dunlop, Alison R., Trask, Stephen E., & Jansen, Andrew N. A Comprehensive Understanding of the Aging Effects of Extreme Fast Charging on High Ni NMC Cathode. United States. https://doi.org/10.1002/aenm.202103712
Tanim, Tanvir R., Yang, Zhenzhen, Finegan, Donal P., Chinnam, Parameswara R., Lin, Yulin, Weddle, Peter J., Bloom, Ira, Colclasure, Andrew M., Dufek, Eric J., Wen, Jianguo, Tsai, Yifen, Evans, Michael C., Smith, Kandler, Allen, Jeffery M., Dickerson, Charles C., Quinn, Alexander H., Dunlop, Alison R., Trask, Stephen E., and Jansen, Andrew N. Fri . "A Comprehensive Understanding of the Aging Effects of Extreme Fast Charging on High Ni NMC Cathode". United States. https://doi.org/10.1002/aenm.202103712. https://www.osti.gov/servlets/purl/1867583.
@article{osti_1867583,
title = {A Comprehensive Understanding of the Aging Effects of Extreme Fast Charging on High Ni NMC Cathode},
author = {Tanim, Tanvir R. and Yang, Zhenzhen and Finegan, Donal P. and Chinnam, Parameswara R. and Lin, Yulin and Weddle, Peter J. and Bloom, Ira and Colclasure, Andrew M. and Dufek, Eric J. and Wen, Jianguo and Tsai, Yifen and Evans, Michael C. and Smith, Kandler and Allen, Jeffery M. and Dickerson, Charles C. and Quinn, Alexander H. and Dunlop, Alison R. and Trask, Stephen E. and Jansen, Andrew N.},
abstractNote = {Extreme fast charging (XFC, =10-15 min charging) is expected to increase the adoption of electric vehicles (EVs), but currently accelerates degradation in Li ion cells. As the battery industry shifts toward high Ni content cathodes, such as LiNi0.8Mn0.1Co0.1O2 [NMC811] -- due to its higher specific capacity, better transport properties, and lower Co content -- a complete understanding of the degradation mechanisms of NMC811 under XFC conditions, and how those compare to lower Ni content cathodes, like LiNi0.5Mn0.3Co0.2O2 [NMC532], is needed. Such comprehensive understanding would identify the most critical materials gaps that need to be addressed for enabling XFC long-life cells for EVs. Using well-defined cells and charging protocols, this study maps out the key aging mechanisms for NMC811 cycled at different XFC conditions [at 1C-9C to 4.1V (~100% state-of-charge [SOC]) and at 9C to 3.63V (~35% SOC), 3.77V (~60% SOC), and 3.94V (~80% SOC)] for up to 1000 cycles. To acquire a fundamental understanding of utilization and degradation, cells were evaluated using a range of electrochemical techniques, and a suite of multimodal and multiscale microscopy techniques to quantify chemical, structural, and crystallographic degradation as a function of cycling conditions for the NMC cathode. When comparing NMC532 to NMC811, it is observed that NMC811 has a greater subsurface crystallographic degradation from layered to rock salt structures and displays a similar magnitude of sub particle cracking. However, the NMC811 maintains superior performance despite those advanced degradations. The superior cycle life performance is attributed to the NMC811 particles having radially oriented grains and improved transport properties. NMC811 showed between 4.6× to 3.15× reduction in capacity fade than NMC532 for charging rates between 4C (e.g., 15-minute charging) and 6C (10-minute charging).},
doi = {10.1002/aenm.202103712},
journal = {Advanced Energy Materials},
number = 22,
volume = 12,
place = {United States},
year = {Fri Apr 22 00:00:00 EDT 2022},
month = {Fri Apr 22 00:00:00 EDT 2022}
}

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