非阻塞I/O
材料科学
法拉第效率
阳极
电解质
化学工程
色散(光学)
电化学
粒子(生态学)
电极
透射电子显微镜
纳米技术
化学
物理
地质学
工程类
光学
物理化学
催化作用
海洋学
生物化学
作者
Guolin Hou,Yu Du,Benli Cheng,Yijun Yang,Daliang Fang,Xiangpeng Kong,Baoqiang Li,Jiaping He,Jianguo Yang,Xi Wu,Fangli Yuan
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2018-11-08
卷期号:1 (11): 5981-5988
被引量:12
标识
DOI:10.1021/acsanm.8b01398
摘要
Structure architectonics have a great effect on the electrochemical performance for conversion mechanism materials because they face inevitable big volume changes and serious agglomeration during the lithiation/delithiation process, subsequent to particle cracking and electrode pulverization. Here, we report a simple method for the scalable preparation of ultrafine NiO nanocubes (∼500 g h–1) with high dispersion and exposed crystal facets reinforced by thermal plasma. In situ transmission electron microscopy observation and density functional theory calculation reveal that NiO nanocubes could not only enable stable morphology and small volume expansion (56%) at full lithiation but also facilitate Li-ion transportation. These characteristics result in improved cycling performance and enhanced rate capability. More importantly, during the lithiation process, ultrafine Ni particles were formed. The Ni particles may catalyze the decomposition of the irreversible Li ion in the solid electrolyte interlayer and lead to increased capacity. Using as Li-ion-battery anodes, the as-synthesized NiO nanocubes show an impressive electrochemical performance: high capacity for long cycles (>1000 mAh g–1; 600 cycles), improved Coulombic efficiency (>99%), and superior rate properties. This work provides a visualized result for exploring the atomic-scale structure evolution of NiO during the lithiation process and is hoped to be a guide for the development of advanced conversion mechanism materials with higher performance.
科研通智能强力驱动
Strongly Powered by AbleSci AI