Cooperating Effects of Conformal Iron Oxide (FeOₓ) ALD Coating and Post-Annealing on Li-Rich Layered Cathode Materials

Abstract

Li-rich layered cathode materials have received wide attention due to their superior Li-storage capability. However, their applications are still limited by capacity degradation and voltage decay, which is caused by the phase transition and metal dissolution during repeated cycling. In this work, iron oxide (FeOx) atomic layer deposition (ALD) was performed on Li-rich layered cathode powders in a fluidized bed reactor, followed by an annealing process to further improve their electrochemical performance. After 100 cycles of charge-discharge at 55 °C and 1C (1C = 250 mA g-1), the cathode made from particles with 40 cycles of FeOx ALD and annealing showed a 73% retention of the initial capacity (221 mAh g-1), while the electrode made from the pristine powders showed only 26% retention of the initial capacity (197 mAh g-1) at the same conditions. The enhancement of Li+ transport and cyclic stability stemmed from a stable Fe-doped spinel phase on the surface of cathode particles after ALD coating followed by annealing. A detailed post-test analysis demonstrated that the modification limited impedance growth and suppressed electrolyte degradation and metal dissolution.

Department(s)

Mechanical and Aerospace Engineering

Second Department

Chemical and Biochemical Engineering

Research Center/Lab(s)

Intelligent Systems Center

Second Research Center/Lab

Center for Research in Energy and Environment (CREE)

Third Research Center/Lab

Center for High Performance Computing Research

Comments

This work was supported by the National Science Foundation [NSF DMR 1464111 and NSF CBET 1510085].

Keywords and Phrases

Annealing; Atomic layer deposition; Iron oxide; Li-rich layered cathode

International Standard Serial Number (ISSN)

0013-4686

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2019 Elsevier Ltd, All rights reserved.

Publication Date

01 Sep 2019

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