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- Title
One-Pot Method for Synthesizing Spherical-Like Metal Sulfide- Reduced Graphene Oxide Composite Powders with Superior Electrochemical Properties for Lithium-Ion Batteries.
- Authors
Park, Gi Dae; Choi, Seung Ho; Lee, Jung‐Kul; Kang, Yun Chan
- Abstract
A facile, one-pot method for synthesizing spherical- like metal sulfide-reduced graphene oxide (RGO) composite powders by spray pyrolysis is reported. The direct sulfidation of ZnO nanocrystals decorated on spherical-like RGO powders resulted in ZnS-RGO composite powders. ZnS nanocrystals with a size below 20 nm were uniformly dispersed on spherical-like RGO balls. The discharge capacities of the ZnS-RGO, ZnO-RGO, bare ZnS, and bare ZnO powders at a current density of 1000 mAg-1 after 300 cycles were 628, 476, 230, and 168 mAhg-1, respectively, and the corresponding capacity retentions measured after the first cycles were 93, 70, 40, and 21 %, respectively. The discharge capacity of the ZnS-RGO composite powders at a high current density of 4000 mAg-1 after 700 cycles was 437 mAhg-1. The structural stability of the highly conductive ZnS-RGO composite powders with ultrafine crystals during cycling resulted in excellent electrochemical properties.
- Subjects
LITHIUM-ion batteries; ENERGY conversion; GRAPHENE oxide; PYROLYSIS; ZINC oxide; NANOCRYSTALS; METAL sulfides; ELECTROCHEMISTRY
- Publication
Chemistry - A European Journal, 2014, Vol 20, Issue 38, p12183
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201403471