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石墨烯改性LiFePO4/C正极材料低温电化学性能研究
作者:江虹1 蔡光兰2 郭瑞松2 韩跃武1 
单位:1. 贵州广播电视大学 贵阳 550004 2. 天津大学材料学院 天津 300072 
关键词:锂离子电池 正极材料 磷酸铁锂 石墨烯 低温性能 
分类号:TM911
出版年,卷(期):页码:2016,44(7):925-930
DOI:
摘要:

采用悬浮液混合法在热处理温度为400 ℃的条件下制备了石墨烯改性LiFePO4/C复合正极材料。利用X射线衍射分析、扫描电子显微镜、透射电子显微镜等对石墨烯改性LiFePO4/C正极材料的组成、结构和形貌进行了表征,并组装扣式电池,在2.0~4.2 V电压范围下测试了其–10 ℃时的电化学性能。结果表明,5%(质量分数,下同)石墨烯改性的正极粉未样品G5颗粒分布均匀,石墨烯构成了三维导电网络;相比其它组分,样品G5在1C倍率下具有最高的放电容量(115.4 mA·h/g),循环200次后容量保持率为93.6%;同时,样品G5具有最低的电荷转移阻抗(106.9 ?)和最高的锂离子扩散系数(7.12×10–11 cm2/s)。
 

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Graphene modified LiFePO4/C cathode material was prepared via a suspension mixing method followed by heat–treatment at 400 ℃. Composition, structure and morphology of graphene modified LiFePO4/C powder were characterized by X–ray diffraction, scanning electron microscope, and transmission electron microscope, respectively. Coin type battery were assembled using graphene modified LiFePO4/C powders in an argon–filled glove box. The electrochemical properties of the batteries were measured at –10 ℃ in the voltage range of 2.0~4.2 V. It is shown that the 5%(mass fraction) graphene modified cathode powder (sample G5) exhibits the best homogeneous particle size distribution among all the samples and presents a 3D conducting network i by graphene. The results also indicate that, compared with other samples, the sample G5 delivers the highest initial discharge capacity (115.4 mA·h/g at 1C) and shows the best cycle performance with 93.6% capacity retention after 200 cycles at 1C. Meanwhile, the battery using cathode powder G5 has the low charge–transfer resistance (106.9 ?) and the high diffusion coefficient of lithium ion (7.12×10–11 cm2/s).
 

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基金项目:
贵州省省校科技合作计划项目([2014]7003)。
作者简介:
江 虹(1960—),女,教授
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