Aqueous Ni-rich-cathode dispersions processed with phosphoric acid for lithium-ion batteries with ultra-thick electrodes
Abstract
Lithium-ion battery (LIB) production can benefit both economically and environmentally from aqueous processing. Although these electrodes have the potential to surpass electrodes conventionally processed with N-methyl-2-pyrrolidone (NMP) in terms of performance, significant issues still exist with respect to ultra-thick cathodes ($$\gg$$4 mAh/cm2 areal capacities). A major concern for these types of electrodes with high-nickel active material stems from lithium leaching from active material, which drives the pH of the dispersion in excess of 12 and subsequently corrodes the current collector interface. As this corrosion reaction proceeds, hydrogen generation at the interface creates bubbles which cause severe cracking in the dried electrode surface. When areal loadings are increased, this effect becomes more pronounced and is detrimental to both mechanical and electrochemical properties of these electrodes. In this work, a technique for mitigating corrosion at the current collector by adjusting the pH of the dispersion with the addition of phosphoric acid is investigated. Phosphoric acid was added in 0.5 wt% increments between 0.0 and 1.5 wt%, and effects on rheology, adhesion, corrosion, and electrochemical performance were investigated. A technique is reported for producing aqueous processed cathodes with areal loadings of 6–8 mAh/cm2 with reduced surface cracking and superior high-rate discharge capacity (i.e. high-power performance) for this class of cathode loadings.
- Authors:
-
[1];
[1];
[1];
[1];
[1]
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office; USDOE Office of Science (SC)
- OSTI Identifier:
- 1649163
- Alternate Identifier(s):
- OSTI ID: 1647693
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Colloid and Interface Science
- Additional Journal Information:
- Journal Volume: 581; Journal Issue: B; Journal ID: ISSN 0021-9797
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; Aqueous cathode dispersions; Thick lithium-ion battery coatings; High-areal-capacity cathodes; High-power performance; pH stabilization; Phosphoric acid addition; Lithium leaching; Current collector corrosion; Electrode dispersion rheology
Citation Formats
Kukay, Alexander, Sahore, Ritu, Parejiya, Anand Vasudevbhai, Hawley, William Blake, Li, Jianlin, and Wood III, David L. Aqueous Ni-rich-cathode dispersions processed with phosphoric acid for lithium-ion batteries with ultra-thick electrodes. United States: N. p., 2020.
Web. doi:10.1016/j.jcis.2020.07.144.
Kukay, Alexander, Sahore, Ritu, Parejiya, Anand Vasudevbhai, Hawley, William Blake, Li, Jianlin, & Wood III, David L. Aqueous Ni-rich-cathode dispersions processed with phosphoric acid for lithium-ion batteries with ultra-thick electrodes. United States. https://doi.org/10.1016/j.jcis.2020.07.144
Kukay, Alexander, Sahore, Ritu, Parejiya, Anand Vasudevbhai, Hawley, William Blake, Li, Jianlin, and Wood III, David L. Wed .
"Aqueous Ni-rich-cathode dispersions processed with phosphoric acid for lithium-ion batteries with ultra-thick electrodes". United States. https://doi.org/10.1016/j.jcis.2020.07.144. https://www.osti.gov/servlets/purl/1649163.
@article{osti_1649163,
title = {Aqueous Ni-rich-cathode dispersions processed with phosphoric acid for lithium-ion batteries with ultra-thick electrodes},
author = {Kukay, Alexander and Sahore, Ritu and Parejiya, Anand Vasudevbhai and Hawley, William Blake and Li, Jianlin and Wood III, David L.},
abstractNote = {Lithium-ion battery (LIB) production can benefit both economically and environmentally from aqueous processing. Although these electrodes have the potential to surpass electrodes conventionally processed with N-methyl-2-pyrrolidone (NMP) in terms of performance, significant issues still exist with respect to ultra-thick cathodes ($\gg$4 mAh/cm2 areal capacities). A major concern for these types of electrodes with high-nickel active material stems from lithium leaching from active material, which drives the pH of the dispersion in excess of 12 and subsequently corrodes the current collector interface. As this corrosion reaction proceeds, hydrogen generation at the interface creates bubbles which cause severe cracking in the dried electrode surface. When areal loadings are increased, this effect becomes more pronounced and is detrimental to both mechanical and electrochemical properties of these electrodes. In this work, a technique for mitigating corrosion at the current collector by adjusting the pH of the dispersion with the addition of phosphoric acid is investigated. Phosphoric acid was added in 0.5 wt% increments between 0.0 and 1.5 wt%, and effects on rheology, adhesion, corrosion, and electrochemical performance were investigated. A technique is reported for producing aqueous processed cathodes with areal loadings of 6–8 mAh/cm2 with reduced surface cracking and superior high-rate discharge capacity (i.e. high-power performance) for this class of cathode loadings.},
doi = {10.1016/j.jcis.2020.07.144},
journal = {Journal of Colloid and Interface Science},
number = B,
volume = 581,
place = {United States},
year = {Wed Aug 05 00:00:00 EDT 2020},
month = {Wed Aug 05 00:00:00 EDT 2020}
}
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