Although tribasic lead sulphate (3BS) has been chemically prepared and found in the cured negative plates of lead-acid batteries (LABs), little was known about its behaviour if it is used directly as their negative active material (NAM). Here, we report a much more facile and energy-saving route to prepare phase pure 3BS powders: after β-PbO is reacted with PbSO4 at 30 °C, elongated 3BS plates of 4~8 μm in length, 1~3 μm in width and 0.1~0.2 μm in thickness are obtained in 4 h. Compared with electrodes prepared from β-PbO, α-PbO and leady oxide, the as-prepared 3BS electrode shows much better performance, which discharges more than 90 at 120 mA g−1 within 100 cycles of 100% DOD (depth of discharge) in a flooded cell. Therefore, 3BS can be used directly as NAM of LABs. It is also worth to notice that using 3BS can reduce the curing/drying time of the plates, thus save energy and produce uniformity in LAB production.
Lead-acid battery Tribasic lead sulphate Negative active material Spent lead-acid battery Recycle
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This work is supported by the Fundamental Research Funds for the Central Universities (3207047452), the Priority Academic Program Development of Jiangsu Higher Education Institutions.
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