CuCo₂O₄ nanoparticles encapsulated by onion-like carbon layers: A promising solution for high-performance lithium ion battery

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• 作者：Dandan Han^a ; ^{loveh_andan@163.com" class="auth_mail" title="E-mail the corresponding author} ; He Hu^b ; Bao Liu^a ; Gengxin Song^a ; He Yan^a ; Juan Di^c ; ^{dingjuan1983@gmail.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：CuCo2O4 ; Onion-like carbon ; Nanocapsules ; Lithium ion battery ; Anode
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：1 August 2016
• 年：2016
• 卷：42
• 期：10
• 页码：12460-12466
• 全文大小：2196 K

文摘

We report an approach of preparing dispersive CuCo₂O₄ nanoparticles completely encapsulated by onion-like carbon (OLC) layers. The CuCo₂O₄/OLC nanocapsules are prepared by the arc discharge method and the following air annealed process. As an anode for lithium ion batteries (LIBs), the discharge capacity of this nanocapsules is 743.2 mA h g⁻¹ at a current of 0.2 A g⁻¹ after 300 cycles. The discharge can also retain 539.6 mA h g⁻¹ at a high current of 5.0 A g⁻¹. The high cycling stability and rate capability result from the nanocapsules combining the advantages of CuCo₂O₄ nanoparticles and OLC shells. The CuCo₂O₄ nanoparticles provide sufficient contact with the electrolyte and rapid three-dimensional Li⁺ diffusion channels; OLC improves the conductivity and the structural stability of CuCo₂O₄ nanoparticles. The CuCo₂O₄/OLC nanocapsules with the high electrochemical performance would have the potential for applications in LIBs with long cycling life and high power density.