Synthesis of nanoparticles-assembled Co₃O₄ microspheres as anodes for Li-ion batteries by spray pyrolysis of CoCl₂ solution

详细信息    查看全文

• 作者：Tao Li ; Xinhai Li ; ^{xinhaili_csu@126.com" class="auth_mail" title="E-mail the corresponding author} ; ^{xinhai-li@csu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Zhixing Wang ; Huajun Guo ; Qiyang Hu ; Wenjie Peng
• 关键词：Spray pyrolysis ; Primary particle size ; Metal oxide ; Anode ; Lithium ion batteries
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：10 August 2016
• 年：2016
• 卷：209
• 期：Complete
• 页码：456-463
• 全文大小：4819 K

文摘

Nanoparticles-assembled Co₃O₄ microspheres with different primary particle size are synthesized via a facile one-step ultrasonic spray pyrolysis process, using CoCl₂·6H₂O as precursor. The as-synthesized Co₃O₄ powders are directly used as anode material for Li-ion batteries without further calcinations. The primary particle size is tuned by controlling the spray pyrolysis temperature and its effects on the electrochemical performance of the prepared samples are systemically investigated. The results reveal that primary particles size exerts significant effect on the initial coulombic efficiency, specific capacity and rate performance. In addition, we find that the temperature of powder collector strongly influences the chlorine content in the products, which is resulted from the chloridization of Co₃O₄ by gaseous HCl from the off-gas. A simple and effective strategy is proposed to prevent the chloridization reaction. The sample with the smallest primary particle size and low Cl content shows the highest initial coulombic efficiency of 73% and a high reversible capacity of 1340 mA h g⁻¹ after 50 cycles at a current density of 200 mA g⁻¹.