Lead Acid Battery Expander: II . Expander Activity Correlation Between Microelectrode and Pasted Electrode

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Abstract
The efficacy of the microelectrode cycle life index in predicting the influence of expander on the pasted electrode performance was carried out from the simultaneous testing of four lignosulfonate expanders by the microelectrode and pasted electrode. Expander was included in the test solution for the microelectrode and in the paste for the pasted electrode. The studies of the effect of expander concentration on both the microelectrode cycle life index and 90% DOD cycle life of negative limited 98 A‐hr test cells were identical, showing an optimum expander concentration for a maximum cyclic performance. Testing of three expander materials obtained from the process variations of the same source material also showed a correlation between the microelectrode cycle life index and the specific capacity of the pasted electrode. Expander activity on the lead electrode performance was observed to vary with the quality and concentration of expander. The application of the microelectrode technique as a quality control tool of the expander material was established.

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