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One‐Pot Method for Synthesizing Spherical‐Like Metal Sulfide–Reduced Graphene Oxide Composite Powders with Superior Electrochemical Properties for Lithium‐Ion Batteries
Author(s) -
Park Gi Dae,
Choi Seung Ho,
Lee JungKul,
Kang Yun Chan
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201403471
Subject(s) - sulfidation , materials science , graphene , composite number , oxide , electrochemistry , chemical engineering , lithium (medication) , sulfide , nanocrystal , current density , spray pyrolysis , metal , nanotechnology , composite material , electrode , metallurgy , sulfur , chemistry , medicine , physics , quantum mechanics , endocrinology , engineering , thin film
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 mA g −1 after 300 cycles were 628, 476, 230, and 168 mA h g −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 mA g −1 after 700 cycles was 437 mA h g −1 . The structural stability of the highly conductive ZnS–RGO composite powders with ultrafine crystals during cycling resulted in excellent electrochemical properties.