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Yolk–Shell, Hollow, and Single‐Crystalline ZnCo 2 O 4 Powders: Preparation Using a Simple One‐Pot Process and Application in Lithium‐Ion Batteries
Author(s) -
Choi Seung Ho,
Kang Yun Chan
Publication year - 2013
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201300300
Subject(s) - materials science , chemical engineering , lithium (medication) , electrochemistry , pyrolysis , phase (matter) , shell (structure) , spray pyrolysis , nanotechnology , electrode , composite material , chemistry , organic chemistry , thin film , medicine , engineering , endocrinology
The electrochemical properties of yolk–shell‐structured, multi‐component, transition‐metal oxides have not yet been properly compared to those of hollow‐structured or nanoscale powders. In this study, yolk–shell, hollow, and single‐crystalline ZnCo 2 O 4 powders with uniform compositions are prepared by using simple gas‐phase reaction methods. Double‐shelled ZnCo 2 O 4 yolk–shell powder is prepared directly from the spray solution by using spray pyrolysis. Single‐crystalline ZnCo 2 O 4 nanopowder is prepared by means of flame spray pyrolysis. The yolk–shell ZnCo 2 O 4 powder shows higher charge and discharge capacities than the hollow and single‐crystalline powders. The yolk–shell, hollow, and single‐crystalline ZnCo 2 O 4 powders deliver discharge capacities of 753, 586, and 206 mAh g −1 , respectively, after 200 cycles at a charge/discharge rate of 3 A g −1 , and the corresponding capacity retentions measured after the first cycle are 99, 74, and 27 %, respectively. The yolk–shell ZnCo 2 O 4 powders are structurally stable during cycling and have good electrochemical properties even at high current densities.