Facile Synthesis for LiFePO4 Nanospheres in Tridimensional Porous Carbon Framework for Lithium Ion Batteries
Facile Synthesis for LiFePO4 Nanospheres in Tridimensional Porous Carbon Framework for Lithium Ion Batteries
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DOI：
10.1021/jp108363y
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发表时间：
2011-01
影响因子：
3.7
通讯作者：
Jianqing Zhao;Jianping He;Jianhua Zhou;Yunxia Guo;Tao Wang;Shi-Jie Wu;Xiaochu Ding;Ruiming Huang-Ruiming-Hu
中科院分区：
文献类型：
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作者：
Jianqing Zhao;Jianping He;Jianhua Zhou;Yunxia Guo;Tao Wang;Shi-Jie Wu;Xiaochu Ding;Ruiming Huang-Ruiming-Hu
良好的电子导电性和高比表面积是锂离子电池电极材料获得高能量和高功率性能的两个关键因素。本文提出了一种在多功能碳骨架中获得纳米球电极材料的可行方法。用一种简便的合成方法制备了平均直径为∼300 nm的LiFePO4纳米球，并将其包裹在三维多孔碳结构中。这种LiFePO4/C复合材料具有∼10−2SCM−1的显著提高的电子电导率和200.5 m2g−1的惊人的高比表面积，并计算了∼10−15−10−14 cm2s−1的锂离子扩散系数。正极材料LiFePO4/C的0.1C放电容量为155.0 mAhg−1，20℃放电容量为69.5mAhg−1。此外，未添加导电碳添加剂的纯LiFePO4/C实体在0.1C放电容量为127.8 mAhg−1。
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 ∼10−2 Scm−1 and amazing high surface area of 200.5 m2g−1, and the lithium ion diffusion coefficient of ∼10−15−10−14 cm2s−1 is calculated. The LiFePO4/C cathode material delivers discharge capacities of 155.0 mAhg−1 at 0.1 C and 69.5 mAhg−1 at 20 C. Furthermore, the pristine LiFePO4/C entity has exhibited discharge capacity of 127.8 mAhg−1 at 0.1 C without conductive carbon additives.