Charge/discharge characteristics charging

Fig. 13. Charge—discharge characteristics of a nominal 140-A-h silver—iron cell where the charge (-) is at 25 A for 8 h, A represents a 0.25 A float...

Figure 20 shows the charge-discharge characteristics of the AA-size nickel-metal hydride battery in comparison with the nickel-cadmium battery produced by Sanyo Electric. Its capacity density is 1.5 to 1.8 higher than that of nickel-cadmium batteries. 

Charge-discharge capacity/mAh Figure 20. Charge-discharge characteristics of an Ni—MH battery (cell type AA). 

Figure 59. Charge-discharge characteristics of some graphite material electrodes (1st cycle current density 0.2 raA cm 2).

Figure 4. Discharge characteristics of RAM AA cells when cycled at 20 °C. The cells are discharged for 4 h per day at 4 Q, and charged overnight with a constant voltage charger at 1.7 V.

Figure 3. Galvanostatic charge/discharge characteristics of a capacitor built from KOH activated carbon A-PM (mass of electrodes 12.2 mg/12.8 mg) 1=2 mA. Electrolytic solution ...

Nickel-melal hydride cells can be discharged at the 2 C rate (and in some cases at 4 C) and charged at 1 C. An AA-sized cell with a nominal capacity of over 1 Ah can thus be discharged at over 2 A and with a peak current of over 10 A. The energy density is highly dependent on rate, but for comparable conditions is 25% higher than an equivalent nickel-cadmium cell. Fig. 6.12 shows a comparison of the discharge characteristics of these two systems. 

Fig. 6.12 Comparison of discharge characteristics for Ni-Cd and Ni-MH cylindrical cells at 20°C. Cell height = 42 mm, cell diameter = 16.5 mm, Charge = 1 C. discharge = 0.2 C. (By permission of National/Panasonic.)...

Fig. 8.5 Typical charge-discharge characteristics of a lithium-silicon electrode in a LiCl-KCl euiectic at 680 K. Current density = 40 mA/cm2. (By permission of the Journal of the Electrochemical Society as Fig 8,3.)...

Fig. 8.10 Charge-discharge characteristics for a Li-FeS cell aL 450°C. BaUery assembled in uncharged state, Current = 5A, (By permission of Academic Press W.J, Walsh and H. Shimotake, Power Sources 6, ed, D.H, Collins, 1977, London,)...

FIGURE 12.20 Charge/discharge characteristics of purified SWCNTs after ball milling. (Reproduced from Gao, B., et al., Chem. Phys. Lett., 307, 153, 1997. With permission.)... 

Mabuchi A, Tokumitsu K, Fujimoto H, Kasuh T. Charge-discharge characteristics of the mesocarbon miocrobeads heat-treated at different temperatures. J Electrochem Soc 1995 142 1041-1046. 

Yang Z, Wu HQ, Simard B. Charge-discharge characteristics of raw acid-oxidized carbon nanotubes. Electrochem Commun 2002 4 574-578. 

Figure 2. Charge-discharge characteristics of the electrode at 1C rate.

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