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.
参考文献
| [1] | 徐艳辉.锂离子电池正极材料电化学[J].稀有金属材料与工程,2003(11):875-879. |
| [2] | Hisayuki Yamane et al.[J].Journal of the Electrochemical Society,2002,149(12):A1514. |
| [3] | Padhi AK.;Goodenough JB.;Nanjundaswamy KS. .PHOSPHO-OLIVINES AS POSITIVE-ELECTRODE MATERIALS FOR RECHARGEABLE LITHIUM BATTERIES[J].Journal of the Electrochemical Society,1997(4):1188-1194. |
| [4] | 卢俊彪,张中太,唐子龙,郑子山.一种新型的锂离子电池正极材料--LiFePO4[J].稀有金属材料与工程,2004(07):679-683. |
| [5] | Masaya Takahashi;Shinichi Tobishima;Koji Takei .Characteriazation of LiFePO_4 as the cathode material for rechargeable lithium batteries[J].Journal of Power Sources,2001(0):508-511. |
| [6] | Anna Andersson S et al.[J].Electrochemical and Solid-State Letters,2000,3(02):66. |
| [7] | Masaya Takahashi et al.[J].Solid State Ionics,2002,148:283. |
| [8] | 罗绍华.[A].上海:上海师范大学,2005:9. |
| [9] | Morgan D et al.[J].Electrochemical and Solid-State Letters,2004,7(02):A30. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%