鋰離子電容器的表征和建模外文翻譯（英文）

1、 Abstract To develop electrical busses for applications with a fast recharge system in stations, PVI has been testing some electrical energy components like supercapacitors and batteries with high power density.

2、 Neverthless, supercapacitors limit average autonomy between two recharge points, due to their poor energy density. On the other side cycle life of batteries are very dependent on current. To surmount these problem

3、s, PVI in collaboration with the FCLAB laboratory and the AMPERE laboratory, are studying Lithium-ion capacitor (LIC) for applications with fast recharge. We take to assess how the storage system meets busses power

4、and energy requirements in heavy electric vehicles. We note that the advantage of LIC technology compared to conventional supercapacitor lies in the fact that the energy density and the nominal voltage are higher. In

5、this study, the Li-ion capacitor is characterized and modelled. The characterization and modelling methods are the same of supercapacitor with double layer activated carbon technology. The LIC efficiency will be

6、 discussed. I. INTRODUCTION Lithium Ion capacitor is a new storage device which combines high power density and high energy density compared to conventional supercapacitor of the market. It has four time higher energy

7、 density than conventional supercapacitor. The structure of the LIC is composed by two electrodes. The positive one is formed by activated carbon as in double layer capacitor. The negative electrode uses lithium ion

8、doped carbon. This new electrode technology boosts the capacity of the negative electrode and increases the electrical potential difference. The electrolyte is based on the Li Ion. Figure 1 shows the elementary stru

9、cture of EDLC and Li-ion capacitor structure. It can be seen that the negative LIC electrode is formed by Li doped Carbone. The equivalent capacitance is formed by the positive electrode capacitance Cdl in series with

10、 the negative one Cli. The equivalent capacitor can be expressed as following: Cli1Cdl1C1eq + =(1) where Cli >> Cdl ? dl eq C C ≈(2) Fig. 1: Elementary structure of EDLC and Li-ion capacitor (JM Energy [1]) The

11、Li Ion capacitor studied in this paper ( figure 2) is fabricated by JM Energy. Their parameters are: nominal capacitance: 2000F; volume 124ml; weight: 208g, ESSCAP’2008 – Lithium Ion capacitor characterization and mod

12、elling H. Gualous(1), G. Alcicek(1), Y. Diab(3), A. Hammar(2), P. Venet(3), K. Adams(4), M. Akiyama(4), C. Marumo(5) (1) FCLAB-SeT, UTBM-UFC, bat F, rue Thierry Mieg 90010 Belfort, (2) PVI, Rue de maison rouge - Zone i

13、ndustrielle Gretz Armainvilliers France (3) AMPERE UMR CNRS 5005, Université de Lyon, Université Lyon 1, 69622 Villeurbanne Cedex, France (4) JSR Micro NV Leuven, Belgium (5) JM Energy, Japan hamid.gualo

14、us@univ-fcomte.fr ESSCAP’08 – 3rd European Symposium on Supercapacitors and ApplicationsRoma (Italy) November 6-7, 2008hal-00373149, version 1 - 27 Aug 2009Author manuscript, published in “ESSCAP, Rome : Italie (200

15、8)“Fig. 5: Charge and discharge of Li Capacitor at constant current TABLE II. ESR OF 2000F LI-ION CAPACITOR Current (A) ESR (m?) 50 1.84 100 1.70 150 1.78 ESR variations with current for these three values can be

16、neglected. B. AC characterization The Li-ion capacitor AC characterization was realized using an Electrochemical Impedance Spectroscopy (EIS). To characterize the studied device, the sweep in frequency must be done fo

17、r various voltage levels. EIS allows the study of the influence of frequency on the Li Ion capacitor. Figure 6 presents the variation of the negative imaginary part as a function of the real part for different voltag

18、e values. It can be seen that the Li-ion capacitor equivalent capacitance C is not linear with voltage. -0.00200.0020.0040.0060.0080.010 0.0005 0.001 0.0015 0.002 0.0025 0.003 0.0035 0.004Re (Z)Im (Z )IM_3.8VIM_2.2VIM

19、_2.6VIM_3.0VIM_3.4VFig. 6: Li Ion capacitor imaginary part as a function of real part for 2.2V, 2.6V, 3V; 3.4V and 3.8V It assumed as a first approximation that Li-ion capacitor is modelled by a resistance in series w

20、ith capacitance. Using the EIS results we deduced the C evolutions as a function of DC voltage. Figure 7 represents the experimental results. It can be seen that Li- ion capacitor equivalent capacitance decreases with

21、 voltage when V<3V and the capacitance increases. 150017001900210023002500270029002 2.5 3 3.5 4Voltage (V)C (F)C(F)-capa4- 1mHzC(F)-capa4- 10mHzC(F)-Capa9- 10mHzC(F)-Capa3- 10mHzFig. 7: C variations with Li-ion capa

22、citor voltage The dc voltage dependency of ESR is depicted in figure 8. No as the classical double layer capacitor, an increase in voltage leads to decrease the ESR. This means in high voltage, we can obtain best dis

23、charging power. Fig. 8 : ESR v. frequency for different voltages Figure 9 shows the variation of capacitance versus the frequency for different voltage from this figure, it(s clear that the Li-ion capacitor equivalent

24、 capacitance C is not linear with voltage. Fig. 9: Capacitance v. frequency for different voltages III. LI-ON CAPACITOR MODELLING To model the LIC components, we have chosen a “multipenetrability” [2] model presented o

25、n figure 10. It is composed of four elements, inductance L, series resistance and complex parallel pore impedances described by the equation below. In the presented model only Zp1 and Zp2 are considered. The model pa