Yolk-Shell, Hollow, and Single-Crystalline ZnCo2O4 Powders: Preparation Using a Simple One-Pot Process and Application in Lithium-Ion Batteries

被引：132

作者：

Choi, Seung Ho ^{[1
]}

Kang, Yun Chan ^{[1
]}

机构：

[1] Konkuk Univ, Dept Chem Engn, Seoul 143701, South Korea

来源：

CHEMSUSCHEM | 2013年 / 6卷 / 11期

基金：

新加坡国家研究基金会;

关键词：

anode materials; energy conversion; lithium ion batteries; nanoparticles; spray pyrolysis; HIGH-PERFORMANCE ANODE; ELECTROCHEMICAL PERFORMANCE; REVERSIBLE CAPACITY; ALLOY ANODES; LI; NANOPARTICLES; NANOMATERIALS; GRAPHENE; MICROSPHERES; COBALT;

D O I：

10.1002/cssc.201300300

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 ZnCo2O4 powders with uniform compositions are prepared by using simple gas-phase reaction methods. Double-shelled ZnCo2O4 yolk-shell powder is prepared directly from the spray solution by using spray pyrolysis. Single-crystalline ZnCo2O4 nanopowder is prepared by means of flame spray pyrolysis. The yolk-shell ZnCo2O4 powder shows higher charge and discharge capacities than the hollow and single-crystalline powders. The yolk-shell, hollow, and single-crystalline ZnCo2O4 powders deliver discharge capacities of 753, 586, and 206mAhg(-1), respectively, after 200 cycles at a charge/discharge rate of 3Ag(-1), and the corresponding capacity retentions measured after the first cycle are 99, 74, and 27%, respectively. The yolk-shell ZnCo2O4 powders are structurally stable during cycling and have good electrochemical properties even at high current densities.

引用

页码：2111 / 2116

页数：6

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