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LiFePO_4 基正极材料容量的温度敏感特性及交流阻抗谱研究(英文) 被引量：8

Temperature Sensitivity to Capacity of LiFePO_4-Based Cathode Materials and AC Impedance Analysis
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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。 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.
作者 罗绍华 唐子龙 卢俊彪 张中太 闫俊萍
机构地区 清华大学
出处 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2007年第5期835-837,共3页 Rare Metal Materials and Engineering
基金 Supported by the National Nature Science Foundation of China (50372003, 50472005) Tsinghua University Fundamental Research Fund (Project No. JC2003040)
关键词 LIFEPO4 正极材料 容量-温度敏感 交流阻抗谱 锂离子电池 LiFePO4. cathode materiah temperature-capacitysensitivity AC impedance lithium-ionbattery
分类号 TM912.9 [电气工程—电力电子与电力传动]
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参考文献9

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二级参考文献17

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共引文献35

同被引文献51

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引证文献8

二级引证文献60

稀有金属材料与工程
2007年 第5期

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