Facile Synthesis for LiFePO4 Nanospheres in Tridimensional Porous Carbon Framework for Lithium Ion Batteries

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• 作者：Jianqing Zhao ; Jianping He ; Jianhua Zhou ; Yunxia Guo ; Tao Wang ; Shicao Wu ; Xiaochun Ding ; Ruiming Huang ; Hairong Xue
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：February 17, 2011
• 年：2011
• 卷：115
• 期：6
• 页码：2888-2894
• 全文大小：893K
• 年卷期：v.115,no.6(February 17, 2011)
• ISSN：1932-7455

文摘

The excellent electronic conductivity and high surface area are two crucial factors for electrode materials to achieve high energy and power capabilities in lithium ion batteries. This article presents a feasible method to obtain nanospherical electrode materials in the versatile carbon framework. A facile synthesis has been developed to prepare LiFePO₄ nanospheres with an average diameter of 300 nm lodged in the tridimensional (3D) porous carbon structure. This LiFePO₄/C composite possesses the considerably enhanced electronic conductivity of 10^鈭? Scm^鈭? and amazing high surface area of 200.5 m²g^鈭?, and the lithium ion diffusion coefficient of 10^鈭?5鈭?0^鈭?4 cm²s^鈭? is calculated. The LiFePO₄/C cathode material delivers discharge capacities of 155.0 mAhg^鈭? at 0.1 C and 69.5 mAhg^鈭? at 20 C. Furthermore, the pristine LiFePO₄/C entity has exhibited discharge capacity of 127.8 mAhg^鈭? at 0.1 C without conductive carbon additives.