Atomic Layer Deposition of Al2O3-Ga2O3 Alloy Coatings for Li[Ni0.5Mn0.3Co0.2]O2 Cathode to Improve Rate Performance in Li-Ion Battery.

Autor:	Laskar MR; Department of Chemical and Biological Engineering, University of Wisconsin Madison , 1415 Engineering Drive, Madison, Wisconsin 53706, United States., Jackson DH; Department of Chemical and Biological Engineering, University of Wisconsin Madison , 1415 Engineering Drive, Madison, Wisconsin 53706, United States., Guan Y; Department of Material Science and Engineering, University of Wisconsin Madison , 1509 University Avenue, Madison, Wisconsin 53706, United States., Xu S; Department of Material Science and Engineering, University of Wisconsin Madison , 1509 University Avenue, Madison, Wisconsin 53706, United States., Fang S; Department of Chemistry, University of Wisconsin Madison , 1101 University Avenue, Madison, Wisconsin 53706, United States., Dreibelbis M; The Dow Chemical Company , 1776 building, Midland, Michigan 48674, United States., Mahanthappa MK; Department of Chemistry, University of Wisconsin Madison , 1101 University Avenue, Madison, Wisconsin 53706, United States., Morgan D; Department of Material Science and Engineering, University of Wisconsin Madison , 1509 University Avenue, Madison, Wisconsin 53706, United States., Hamers RJ; Department of Chemistry, University of Wisconsin Madison , 1101 University Avenue, Madison, Wisconsin 53706, United States., Kuech TF; Department of Chemical and Biological Engineering, University of Wisconsin Madison , 1415 Engineering Drive, Madison, Wisconsin 53706, United States.
Jazyk:	angličtina
Zdroj:	ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2016 Apr 27; Vol. 8 (16), pp. 10572-80. Date of Electronic Publication: 2016 Apr 13.
DOI:	10.1021/acsami.5b11878
Abstrakt:	Metal oxide coatings can improve the electrochemical stability of cathodes and hence, their cycle-life in rechargeable batteries. However, such coatings often impose an additional electrical and ionic transport resistance to cathode surfaces leading to poor charge-discharge capacity at high C-rates. Here, a mixed oxide (Al2O3)1-x(Ga2O3)x alloy coating, prepared via atomic layer deposition (ALD), on Li[Ni0.5Mn0.3Co0.2]O2 (NMC) cathodes is developed that has increased electron conductivity and demonstrated an improved rate performance in comparison to uncoated NMC. A "co-pulsing" ALD technique was used which allows intimate and controlled ternary mixing of deposited film to obtain nanometer-thick mixed oxide coatings. Co-pulsing allows for independent control over film composition and thickness in contrast to separate sequential pulsing of the metal sources. (Al2O3)1-x(Ga2O3)x alloy coatings were demonstrated to improve the cycle life of the battery. Cycle tests show that increasing Al-content in alloy coatings increases capacity retention; whereas a mixture of compositions near (Al2O3)0.5(Ga2O3)0.5 was found to produce the optimal rate performance.
Databáze:	MEDLINE
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