Minimized Metal Dissolution from High-Energy Nickel Cobalt Manganese Oxide Cathodes with Al2O3 Coating and Its Effects on Electrolyte Decomposition on Graphite Anodes

Authors

Sunhyung Jurng
Satu Kriistina Heiskanen
KWD Kaveendi Chandrasiri
Maheeka Yapa Abeywardana
Brett L. Lucht, University of Rhode IslandFollow

Document Type

Article

Date of Original Version

8-7-2019

Department

Chemistry

Abstract

High-energy nickel cobalt manganese oxides have been studied intensively as cathode materials for lithium-ion batteries. However, several hurdles need to be overcome to adopt these cathodes in commercial lithium-ion batteries. Herein, aluminum oxide (Al₂O₃) coating was applied to high-energy nickel cobalt manganese oxides (HE-NCM, Li_1.33Ni_0.27Co_0.13Mn_0.60O_2+d) by atomic layer deposition (ALD) and its effects on HE-NCM/graphite full cells were investigated. HE-NCM/graphite full cells have better cycling performance and efficiency when HE-NCM is coated with Al₂O₃. ICP-MS measurements show that the Al₂O₃ coating can effectively prevent transition metal dissolution from HE-NCM. XPS and FT-IR analysis suggests that the surface film on HE-NCM cathodes does not change significantly with the Al₂O₃ coating even after 50 cycles, however the surface film on graphite anodes shows a significant change. The resistance of graphite electrodes cycled with the uncoated HE-NCM is higher than that of graphite electrodes cycled with the Al₂O₃-coated HE-NCM due to the increased SEI thickness. The improved cycling performance of HE-NCM/graphite cells with Al₂O₃ coating can be attributed to the minimized resistance increase on graphite as well as the suppression of cathode active material loss.

Citation/Publisher Attribution

Sunhyung Jurng et al 2019 J. Electrochem. Soc. 166 A2721. https://doi-org.uri.idm.oclc.org/10.1149/2.0101913jes

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 License.