| LiFePO4基正极材料容量的温度敏感特性及交流阻抗谱研究 |
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| 引用本文： | 罗绍华,唐子龙,卢俊彪,张中太,闫俊萍.LiFePO4基正极材料容量的温度敏感特性及交流阻抗谱研究[J].稀有金属材料与工程,2007,36(5):835-837. |
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| 作者姓名： | 罗绍华 唐子龙 卢俊彪 张中太 闫俊萍 |
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| 作者单位： | 1. 清华大学,北京,100084;清华大学深圳研究生院,深圳,518055
2. 清华大学,北京,100084 |
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| 基金项目： | 国家自然科学基金;清华大学校科研和教改项目 |
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| 摘 要： | 采用原位碳包覆法制备了锂离子二次电池用LiFePO4／C复合正极材料。考察了环境温度对LiFePO4/C电池容量的影响，得到容量与绝对温度之间符合Arrhenius关系。运用交流阻抗谱分析了温度与电池电化学特性的关系，并对电极基于电荷和质量传递控制过程给出了一种新的模拟等效电路，通过Zview拟合软件得到了各个模拟元件的数值及变化趋势，从而定量地解释LiFePO4／C复合电极容量与温度的关系。
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| 关 键 词： | 正极材料 容量-温度敏感 交流阻抗谱 锂离子电池 |
| 文章编号： | 1002-185X(2007)05-0835-03 |
| 修稿时间： | 2006-04-27 |
Temperature Sensitivity to Capacity of LiFePO4-Based Cathode Materials and AC Impedance Analysis |
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| Luo Shaohu,Tang Zilong,Lu Junbiao,Zhang Zhongtai,Yan Junping.Temperature Sensitivity to Capacity of LiFePO4-Based Cathode Materials and AC Impedance Analysis[J].Rare Metal Materials and Engineering,2007,36(5):835-837. |
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| Authors: | Luo Shaohu Tang Zilong Lu Junbiao Zhang Zhongtai Yan Junping |
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| Affiliation: | 1. Tsinghua University, Beijing 100084, China; 2. Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China |
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| Abstract: | LiFePO4/C composition cathode was synthesized by a method of in-situ carbon coating. The influence of ambient temperature on the capacity of LiFePO4/C was investigated. The Arrhenius relationship between capacity and temperature was observed by linear fit and deduced. Temperature dependence of its electrochemical characteristic was evaluated by using AC impedance spectroscopy. A new equivalent circuit based on the charge and mass transfer control process in electrode was suggested to fit the obtained AC impedance spectra. The tendency of every element in equivalent circuit obtained by Zview fitting system was used to interpret the temperature dependence of capacity for LiFePO4/C composition cathode. |
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| Keywords: | LiFePO4 LiFePO4 cathode material temperature-capacity sensitivity AC impedance lithium-ion battery |
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