A Comprehensive Understanding on How Ultrathin Coating Layers on Active Particles Enhance Battery Performance Significantly
Although atomic layer deposition (ALD) coating strategies for active materials in lithium ion batteries are more effective than other coating techniques to improve battery performance, there is substantial uncertainty as to how such coatings are a source of improved performance. A comprehensive model has been developed based on experimental measurements and theoretical analysis to study the effects of various coating strategies on the mechanical and electrochemical reactions of battery systems. Thicker coatings can help provide higher capacity and cycle life improvements, but too thick layers can act as a migration barrier, causing much slower lithium transport, resulting in reduced capacity. In addition, the developed model quantitatively predicts the capacity retention of coated particles by mitigating the dissolution of transition metal ions, which is one important capacity of the metal oxide cathode materials. Experimental observation of coated and uncoated LiMn2O4-Li foil cells supports our framework for modeling and understanding the contribution of thin coatings to the improved behavior of cathode particles.
S. Sarkar et al., "A Comprehensive Understanding on How Ultrathin Coating Layers on Active Particles Enhance Battery Performance Significantly," ECS Transactions, vol. 77, no. 11, pp. 425-436, Electrochemical Society, Jun 2017.
The definitive version is available at https://doi.org/10.1149/07711.0425ecst
231st ECS Meeting (2017: May 28-Jun. 1, New Orleans, LA)
Chemical and Biochemical Engineering
Mechanical and Aerospace Engineering
Keywords and Phrases
Atomic Layer Deposition; Cathodes; Coated Materials; Coating Techniques; Coatings; Electric Batteries; Electrodes; Lithium; Metal Ions; Metals; Secondary Batteries; Transition Metal Compounds; Transition Metals; Atomic Layer Deposition Coatings; Battery Performance; Capacity Retention; Comprehensive Model; Electrochemical Reactions; Metal Oxide Cathodes; Migration Barriers; Ultrathin Coatings; Lithium-Ion Batteries
International Standard Serial Number (ISSN)
Article - Conference proceedings
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