Discharge alkaline manganese cell

Figure 4. Comparison between the discharge characteristics of newly developed and conventional alkaline-manganese cells (load 7.5 Q temperature 20 °C)...

Fig. 4.24 Capacity of lithium-copper oxide button cells (LC 01) as a function of discharge current (solid lines). Dashed lines indicate the characteristics of alkaline manganese cells of similar dimensions. (By courtesy of SAFT Gipclec.)...

Fig. 4.30 Comparison of the discharge curves of AA-sizc lithium-iron sulphide and alkaline manganese cells 3,9 ft continuous load) at (a) 21°C and (b) — 20°C, (By permission of Evcready.)...

The construction of organic lithium cells is somewhat different from that of mercury and alkaline manganese cells. A lithium foil anode, a separator and a carbonaceous cathode are spirally wound together. This assembly is placed in a steel case, and the anode and eathode are eonnected with welded tabs to the case and top assembly. Since the electrolyte is non-aqueous, there is no hydrogen gas evolved during discharge. The... 

Fig. 9. Effect of time and storage temperatures. A, 40°C B, 20°C and C, 0°C, on relative discharge performance of fresh and aged "D"-si2e cells on simulated radio use, 25- Q 4-h/d test for (a) alkaline—manganese, and (b) carbon—2inc batteries (22).

The design of a AA-size alkaline manganese dioxide cell is shown in Fig. 1 (Sec. 3.1). Primary and secondary alkaline batteries are constructed in the same way and can be manufactured on essentially the same machinery. The separator material, electrode formulation, and the Mn02 Zn balance are different. Rechargeable cells are zinc-limited to prevent a discharge beyond the first electron-equivalent of the MnOz reduction. The electrolyte is 7-9 mol L KOH. The electrode reactions are ... 

Provided that the reduction does not exceed a level equivalent to Mn0li33 the reaction can be reversed and the cathode recharged. In practice this means limiting the discharge at 0.9 V. The rechargeable alkaline manganese (RAM) cell is discussed in Chapter 6. 

Fig, 3.21 Discharge curve of a D-size alkaline manganese primary cell with an initial currem drain of 500 mA... 

D-size cells on 2.25 O continuous test are reported. Cell (a) is a standard Leclanchd cell using a natural ore cell (b) is a HD Leclanche with electrolyte Mn02 cell (c) is a zinc chloride cell and cell (d) is an alkaline manganese primary unit. The differences at this current drain are striking the discharge capacities with a 0.9 V cut-off are in the ratio 0.12 0.24 0.55 1.00 for the four types. However, when less severe tests are considered, the disparities are less pronounced. Thus for the light industrial flashlight (LIF) test, the ratios are 0.40 0.61 0.96 1.00. 

Fig. 4. 25 Comparison of discharge curves at ambient temperature of voltage-compatible lithium-copper oxide button cells and conventional aqueous cells (a) lithium-copper oxide (b) alkaline manganese (c) zinc-silver oxide. Load = 75 k i...

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