Mechanistic Insight into the Stability of HfO2-Coated MoS2 Nanosheet Anodes for Sodium Ion Batteries
KAUST DepartmentMaterials Science and Engineering Program
MetadataShow full item record
AbstractIt is demonstrated for the first time that surface passivation of 2D nanosheets of MoS2 by an ultrathin and uniform layer of HfO2 can significantly improve the cyclic performance of sodium ion batteries. After 50 charge/discharge cycles, bare MoS2 and HfO2 coated MoS2 electrodes deliver the specific capacity of 435 and 636 mAh g-1, respectively, at current density of 100 mA g-1. These results imply that batteries using HfO2 coated MoS2 anodes retain 91% of the initial capacity; in contrast, bare MoS2 anodes retain only 63%. Also, HfO2 coated MoS2 anodes show one of the highest reported capacity values for MoS2. Cyclic voltammetry and X-ray photoelectron spectroscopy results suggest that HfO2 does not take part in electrochemical reaction. The mechanism of capacity retention with HfO2 coating is explained by ex situ transmission electron microscope imaging and electrical impedance spectroscopy. It is illustrated that HfO2 acts as a passivation layer at the anode/electrolyte interface and prevents structural degradation during charge/discharge process. Moreover, the amorphous nature of HfO2 allows facile diffusion of Na ions. These results clearly show the potential of HfO2 coated MoS2 anodes, which performance is significantly higher than previous reports where bulk MoS2 or composites of MoS2 with carbonaceous materials are used. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
- Surface Passivation of MoO₃ Nanorods by Atomic Layer Deposition toward High Rate Durable Li Ion Battery Anodes.
- Authors: Ahmed B, Shahid M, Nagaraju DH, Anjum DH, Hedhili MN, Alshareef HN
- Issue date: 2015 Jun 24
- SnO2 anode surface passivation by atomic layer deposited HfO2 improves Li-ion battery performance.
- Authors: Yesibolati N, Shahid M, Chen W, Hedhili MN, Reuter MC, Ross FM, Alshareef HN
- Issue date: 2014 Jul 23
- An advanced MoS2 /carbon anode for high-performance sodium-ion batteries.
- Authors: Wang J, Luo C, Gao T, Langrock A, Mignerey AC, Wang C
- Issue date: 2015 Jan 27
- ALD TiO<sub>2</sub>-Coated Flower-like MoS<sub>2</sub> Nanosheets on Carbon Cloth as Sodium Ion Battery Anode with Enhanced Cycling Stability and Rate Capability.
- Authors: Ren W, Zhou W, Zhang H, Cheng C
- Issue date: 2017 Jan 11
- Ultrathin sandwich-like MoS2@N-doped carbon nanosheets for anodes of lithium ion batteries.
- Authors: Jeong JM, Lee KG, Chang SJ, Kim JW, Han YK, Lee SJ, Choi BG
- Issue date: 2015 Jan 7