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Additional resources for Elektor Electronics (April 2007)

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The 10 C (23 A) discharge test also went smoothly, with the cell temperature rising to 49 °C. 84 V per cell. The calculated energy density was 94 Wh/kg. 24 V at 10 C discharge. The energy density is slightly but measurably lower than the FePO4 cell at 89 Wh/kg. This difference can be ascribed to the lower cell weight. 5 V and above at 10 C. The energy density of high-current LiPo cells is typically between 120 Wh/kg and 170 Wh/kg. 3 A charge and discharge current; at 45 °C, 3 A charge and 5 A discharge current; at 60 °C, 3 A charge and 5 A discharge current) 95 % 88 % 77 % (Source: A123 Systems) Figure 1.

Includes plastic case 130x100x30mm. Supply: 12Vdc/500mA. 95 NEW! Bi-Polar Stepper Motor Driver Drive any bi-polar stepper motor using externally supplied 5V levels for stepping and direction control. These usually come from software running on a computer. Supply: 8-30Vdc. PCB: 75x85mm. 95 NEW! Bidirectional DC Motor Controller Controls the speed of most common DC motors (rated up to 16Vdc/5A) in both the forward and reverse direction. The range of control is from fully OFF to fully ON in both directions.

Although they offer an unsurpassed energy density they are difficult and expensive to manufacture and require careful handling and gentle charging. Things could be about to change with the introduction of nanotechnology into the manufacture of the cathode. The author tested some of the first examples of these new Li-ion units for Elektor Electronics, with results varying from the merely respectable to the sensational! LiPo (lithium polymer electrolyte) batteries have been used at high discharge currents by model aircraft builders for years [1].

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