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Title: Understanding limiting factors in thick electrode performance as applied to high energy density Li-ion batteries

Abstract

We present that increasing electrode thickness, thus increasing the volume ratio of active materials, is one effective method to enable the development of high energy density Li-ion batteries. In this study, an energy density versus power density optimization of LiNi0.8Co0.15Al0.05O2 (NCA)/graphite cell stack was conducted via mathematical modeling. The energy density was found to have a maximum point versus electrode thickness (critical thickness) at given discharging C rates. The physics-based factors that limit the energy/power density of thick electrodes were found to be increased cell polarization and underutilization of active materials. The latter is affected by Li-ion diffusion in active materials and Li-ion depletion in the electrolyte phase. Based on those findings, possible approaches were derived to surmount the limiting factors. Finally, the improvement of the energy–power relationship in an 18,650 cell was used to demonstrate how to optimize the thick electrode parameters in cell engineering.

Authors:
ORCiD logo [1];  [1];  [1];  [2];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Energy and Transportation Science Division
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computer Science and Mathematics Division
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), Vehicle Technologies Office (EE-3V)
OSTI Identifier:
1346648
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Electrochemistry
Additional Journal Information:
Journal Volume: 47; Journal Issue: 3; Journal ID: ISSN 0021-891X
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 25 ENERGY STORAGE; Thick electrodes; Numerical modeling; Energy/power density; Li-ion depletion

Citation Formats

Du, Zhijia, Wood, David L., Daniel, Claus, Kalnaus, Sergiy, and Li, Jianlin. Understanding limiting factors in thick electrode performance as applied to high energy density Li-ion batteries. United States: N. p., 2017. Web. https://doi.org/10.1007/s10800-017-1047-4.
Du, Zhijia, Wood, David L., Daniel, Claus, Kalnaus, Sergiy, & Li, Jianlin. Understanding limiting factors in thick electrode performance as applied to high energy density Li-ion batteries. United States. https://doi.org/10.1007/s10800-017-1047-4
Du, Zhijia, Wood, David L., Daniel, Claus, Kalnaus, Sergiy, and Li, Jianlin. Thu . "Understanding limiting factors in thick electrode performance as applied to high energy density Li-ion batteries". United States. https://doi.org/10.1007/s10800-017-1047-4. https://www.osti.gov/servlets/purl/1346648.
@article{osti_1346648,
title = {Understanding limiting factors in thick electrode performance as applied to high energy density Li-ion batteries},
author = {Du, Zhijia and Wood, David L. and Daniel, Claus and Kalnaus, Sergiy and Li, Jianlin},
abstractNote = {We present that increasing electrode thickness, thus increasing the volume ratio of active materials, is one effective method to enable the development of high energy density Li-ion batteries. In this study, an energy density versus power density optimization of LiNi0.8Co0.15Al0.05O2 (NCA)/graphite cell stack was conducted via mathematical modeling. The energy density was found to have a maximum point versus electrode thickness (critical thickness) at given discharging C rates. The physics-based factors that limit the energy/power density of thick electrodes were found to be increased cell polarization and underutilization of active materials. The latter is affected by Li-ion diffusion in active materials and Li-ion depletion in the electrolyte phase. Based on those findings, possible approaches were derived to surmount the limiting factors. Finally, the improvement of the energy–power relationship in an 18,650 cell was used to demonstrate how to optimize the thick electrode parameters in cell engineering.},
doi = {10.1007/s10800-017-1047-4},
journal = {Journal of Applied Electrochemistry},
number = 3,
volume = 47,
place = {United States},
year = {2017},
month = {2}
}

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