The low-temperature performance of automotive lead–acid batteries is liable to decrease after service in a high-temperature environment such as the engine compartment. To improve the high-temperature durability of lead-acid batteries, a new organic expander is selected as an additive for negative electrodes. The presentation will describe the mechanism by which the new expander exhibits superior durability compared with conventional technology. The results indicate that the pore size of the negative active-material is due to the colloidal size of the organic expander in sulfuric acid solution. The small colloidal particles of the new material contribute to the formation and maintenance of narrow pores in the negative active-material, and this fine-grained structure results in the high discharge capacity at low temperature.


Yasuyuki Hamano
GS Yuasa International Ltd.

Ikumi Ban
GS Yuasa International Ltd.
Leader, Technical Development Division

Takao Tsutsumi
GS Yuasa International Ltd.
Group Manager, Technical Development Division

Yoshiaki Yamaguchi
GS Yuasa International Ltd.
General Manager, Technical Development Division

Biography: Yasuyuki Hamano received a master’s degree of agriculture from Kyoto University in March 2012. He then joined the Technical Development Division of GS Yuasa International Ltd. He has been researching high-performance electrodes for lead–acid batteries.


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