Ultrathin surface coatings for enhanced cycleability of li-ion battery electrodes at elevated temperature

Document Type

Conference Proceeding

Publication Date

4-25-2013

Abstract

To enhance cycleability of LiMn2O4 at elevated temperature, we use atomic layer deposition (ALD) method to deposit a variety of ultrathin oxide (ZnO, ZrO2, Al2O3) coatings for surface modification of LiMn2O4 electrodes. These ALD coatings are highly-conformal, uniform, and homogeneous, and their thickness can be accurately tuned at atomic scale by varying number of ALD growth cycles. Six oxide ALD layers (as thin as ∼1 nm) demonstrate to have optimal coating thickness for maximized performance of lithium ion batteries. All LiMn 2O4 electrodes modified with 6 oxide ALD layers exhibit significantly enhanced electrochemical performances than bare electrodes at both 25°C and 55°C. In addition, ZnO ALD coating is the most effective protective film for improved electrochemical performance of LiMn 2O4, followed by ZrO2 and Al2O 3. It is also found that the effect of ALD coating on improving cycleability and capacity of LiMn2O4 is more phenomenal at elevated temperature than at room temperature.

Publication Source (Journal or Book title)

TMS Annual Meeting

First Page

789

Last Page

796

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