Corrosion Mitigation and Increased Discharge Capacity in Aqueous Processed Thick Cathodes using Phosphoric Acid Additives

Conference · Fri May 01 00:00:00 EDT 2020

OSTI ID:1763449

Kukay, Alexander  ^[1]; Sahore, Ritu  ^[1]; Parejiya, Anand Vasudevbhai ^[1]; Hawley, William ^[1]; Li, Jianlin  ^[1]; Wood III, David  ^[1]

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1. ORNL

Aqueous processed cathodes for lithium-ion batteries are favorable for both cost and environmental reasons; however, these electrodes still face significant problems with increasing areal capacities (i.e. thickness). Highly basic slurry conditions (pH in excess of 12) corrode the current collector surface and evolve hydrogen gas. Consequently, bubbling at the electrode interface causes substantial damage to the dried electrode. As the loading of these electrodes is increased, damage becomes severe and results in lack of adhesion and cohesion. Here introduction of phosphoric acid to combat the rise in pH and suppress the corrosion at the current collector surface is investigated. Phosphoric acid was added in increments of 0.5, 1.0, and 1.5 wt% and the subsequent effects on slurry rheology, particle size, adhesion, and electrochemical cycling were investigated. A technique is reported for obtaining thick (6-8 mAh/cm2) cathodes that exhibit reduced surface cracking and improved rate performance as compared to control samples.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1763449
• Resource Relation: Conference: 237th Meeting of the Electrochemical Society (ECS) - Montreal, , Canada - 5/10/2020 4:00:00 AM-5/14/2020 4:00:00 AM
• Country of Publication: United States
• Language: English