Gallium sulfide-single-walled carbon nanotube composites : High-performance anodes for lithium-ion batteries

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Xiangbo Meng
  • Kai He
  • Dong Su
  • Xiaofeng Zhang
  • Chengjun Sun
  • Hsien-Hau Wang
  • Wei Weng
  • Lynn Trahey
  • Christian P. Canlas
  • Jeffrey W. Elam

Detail(s)

Original languageEnglish
Pages (from-to)5435-5442
Journal / PublicationAdvanced Functional Materials
Volume24
Issue number34
Publication statusPublished - 10 Sep 2014
Externally publishedYes

Abstract

Metal sulfides are an important class of functional materials possessing exceptional electrochemical performance and thus hold great promise for rechargeable secondary batteries. In this work, we deposited gallium sulfide (GaSx, x = 1.2) thin films by atomic layer deposition (ALD) onto single-walled carbon nanotube (SWCNT) powders. The ALD GaSx was performed at 150 °C, and produced uniform and conformal amorphous films. The resulting core-shell, nanostructured SWCNT-GaSx composite exhibited excellent electrochemical performance as an anode material for lithium-ion batteries (LIBs), yielding a stable capacity of ≈575 mA g-1 at a current density of 120 mA g-1 in the voltage window of 0.01-2 V, and an exceptional columbic efficiency of >99.7%. The GaSx component of the composite produced a specific capacity of 766 mA g-1, a value two times that of conventional graphite anodes. We attribute the excellent electrochemical performance of the composite to four synergistic effects: 1) the uniform and conformal ALD GaSx coating offers short electronic and Li-ion pathways during cycling; 2) the amorphous structure of the ALD GaSx accommodates stress during lithiation-delithiation processes; 3) the mechanically robust SWCNT framework also accommodates stress from cycling; 4) the SWCNT matrix provides a continuous, high conductivity network. Single-walled carbon nanotubes (SWCNTs) are uniformly infiltrated and coated with amorphous GaSx using atomic layer deposition (ALD). The resulting SWCNT-GaSx, core-shell nanocomposites exhibit reliable cycling and sustained high capacity as lithium-ion battery anodes compared to pure SWCNTs and commercial microsized Ga2S3. This work demonstrates a general strategy for the design and synthesis of functional nanomaterials.

Research Area(s)

  • anode, atomic layer deposition, carbon nanotube, composite, gallium sulfide, high performance, lithium-ion battery

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

Gallium sulfide-single-walled carbon nanotube composites : High-performance anodes for lithium-ion batteries. / Meng, Xiangbo; He, Kai; Su, Dong; Zhang, Xiaofeng; Sun, Chengjun; Ren, Yang; Wang, Hsien-Hau; Weng, Wei; Trahey, Lynn; Canlas, Christian P.; Elam, Jeffrey W.

In: Advanced Functional Materials, Vol. 24, No. 34, 10.09.2014, p. 5435-5442.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review