Selecting the Best Graphite for Long-Life, High-Energy Li-Ion Batteries
Abstract
Here, most lithium-ion batteries still rely on intercalation-type graphite materials for anodes, so it is important to consider their role in full cells for applications in electric vehicles. Here, we systematically evaluate the chemical and physical properties of six commercially-available natural and synthetic graphites to establish which factors have the greatest impact on the cycling stability of full cells with nickel-rich LiNi0.8Mn0.1Co0.1O2 (NMC811) cathodes. Electrochemical data and post-mortem characterization explain the origin of capacity fade. The NMC811 cathode shows large irreversible capacity loss and impedance growth, accounting for much of full cell degradation. However, six graphite anodes demonstrate significant differences with respect to structural change, surface area, impedance growth, and SEI chemistry, which impact overall capacity retention. We found long cycle life correlated most strongly with stable graphite crystallite size. In addition, graphites with lower surface area generally had higher coulombic efficiencies during formation cycles, which led to more stable long-term cycling. The best graphite screened here enables a capacity retention around 90% in full pouch cells over extensive long-term cycling compared to only 82% for cells with the lowest performing graphite. The results show that optimal graphite selection improves cycling stability of high energy lithium-ion cells.
- Authors:
-
[1];
[1];
[1];
[1];
[1];
[1];
[1];
[2]
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
- 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)
- OSTI Identifier:
- 1456808
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the Electrochemical Society
- Additional Journal Information:
- Journal Volume: 165; Journal Issue: 9; Journal ID: ISSN 0013-4651
- Publisher:
- The Electrochemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; cycling stability; graphite anode; Ni-rich cathode
Citation Formats
Mao, Chengyu, Wood, Marissa, David, Lamuel Abraham, An, Seong Jin, Sheng, Yangping, Du, Zhijia, Meyer, III, Harry M., Ruther, Rose E., and Wood, III, David L. Selecting the Best Graphite for Long-Life, High-Energy Li-Ion Batteries. United States: N. p., 2018.
Web. https://doi.org/10.1149/2.1111809jes.
Mao, Chengyu, Wood, Marissa, David, Lamuel Abraham, An, Seong Jin, Sheng, Yangping, Du, Zhijia, Meyer, III, Harry M., Ruther, Rose E., & Wood, III, David L. Selecting the Best Graphite for Long-Life, High-Energy Li-Ion Batteries. United States. https://doi.org/10.1149/2.1111809jes
Mao, Chengyu, Wood, Marissa, David, Lamuel Abraham, An, Seong Jin, Sheng, Yangping, Du, Zhijia, Meyer, III, Harry M., Ruther, Rose E., and Wood, III, David L. Sat .
"Selecting the Best Graphite for Long-Life, High-Energy Li-Ion Batteries". United States. https://doi.org/10.1149/2.1111809jes. https://www.osti.gov/servlets/purl/1456808.
@article{osti_1456808,
title = {Selecting the Best Graphite for Long-Life, High-Energy Li-Ion Batteries},
author = {Mao, Chengyu and Wood, Marissa and David, Lamuel Abraham and An, Seong Jin and Sheng, Yangping and Du, Zhijia and Meyer, III, Harry M. and Ruther, Rose E. and Wood, III, David L.},
abstractNote = {Here, most lithium-ion batteries still rely on intercalation-type graphite materials for anodes, so it is important to consider their role in full cells for applications in electric vehicles. Here, we systematically evaluate the chemical and physical properties of six commercially-available natural and synthetic graphites to establish which factors have the greatest impact on the cycling stability of full cells with nickel-rich LiNi0.8Mn0.1Co0.1O2 (NMC811) cathodes. Electrochemical data and post-mortem characterization explain the origin of capacity fade. The NMC811 cathode shows large irreversible capacity loss and impedance growth, accounting for much of full cell degradation. However, six graphite anodes demonstrate significant differences with respect to structural change, surface area, impedance growth, and SEI chemistry, which impact overall capacity retention. We found long cycle life correlated most strongly with stable graphite crystallite size. In addition, graphites with lower surface area generally had higher coulombic efficiencies during formation cycles, which led to more stable long-term cycling. The best graphite screened here enables a capacity retention around 90% in full pouch cells over extensive long-term cycling compared to only 82% for cells with the lowest performing graphite. The results show that optimal graphite selection improves cycling stability of high energy lithium-ion cells.},
doi = {10.1149/2.1111809jes},
journal = {Journal of the Electrochemical Society},
number = 9,
volume = 165,
place = {United States},
year = {2018},
month = {6}
}
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