Development of advanced coating process on NMC with Li-ionic conductive materials
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Date
2020-05
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Publisher
The Ohio State University
Abstract
As the hybrid electric vehicles (HEV) and electric vehicles (EV) occupies more in the automobile market, the battery industry faces enormous challenge since the demands for high-performance batteries increase fast by time. The currently used batteries are typically lithium-ion batteries due to its high energy density. There are still significant needs to improve the cycle lives and abuse tolerance of Li-ion batteries, especially for EV applications. In this regard, protecting the surface of cathode, which is the most expensive components in Li-ion batteries, will be an effective approach to extend the life of battery cells. This research aims to improve battery performances by implementing Li1.4Al0.4Ti1.6(PO4)3 (LATP), Li-ionic conductive material, in the cathode by using different methods: powder mixing and electrode plating methods. For the powder mixing method, LATP and LiNi0.6Mn0.2Co0.2O2 (NMC) powder were mixed with two compositions: NMC: LATP = 1:1 or 3:1 wt. ratio. For the electrode plating method, the LATP slurry was coated on the pre-coated NMC cathode. Here, thickness of the plated LATP layer on top of the NMC cathode was controlled to investigate its impact on the Li-ion battery performance. The results showed that both methods offer the improved cycle-ability and/or rate-capability.
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Keywords
Lithium-ion battery, coating, LATP, NMC