Methanothermal treatment of carbonated mixtures of PbSO₄ and PbO₂ to聽synthesize 伪-PbO for lead acid batteries

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• 作者：Pengran Gao ; Weixin Lv ; Rui Zhang ; Yi Liu ; Guanghua Li ; Xianfu Bu ; Lixu Lei
• 关键词：Lead monoxide ; Lead dioxide ; Lead sulphate ; Methanothermal reaction ; Lead acid battery ; Positive material
• 刊名：Journal of Power Sources
• 出版年：15 February, 2014
• 年：2014
• 卷：248
• 期：Complete
• 页码：363-369
• 全文大小：3032 K

文摘

We have developed a novel route to make new batteries from spent ones, in which we obtain and regenerate the active materials of positive electrode and negative electrode respectively. For the spent lead acid batteries, the positive electrode active materials contain both PbSO₄ and PbO₂. To make full use of them, we have to investigate the treatment of the mixtures rather than only PbO₂, which we have reported previously. Here we report our investigation on three mixtures of PbSO₄ and PbO₂ in different mole ratios, as well as the electrode materials directly from the spent batteries. The mixtures are firstly desulphated, and then solvothermally processed in methanol at 140聽掳C for 24聽h. The as-obtained solids contain both PbO路PbCO₃ and PbCO₃, which have been calcined to form 伪-PbO. The 伪-PbO powders are similar irregular particles and highly electrochemically active, which discharge around 170聽mAh聽g^鈭? at 5聽mA聽g^鈭?, 80聽mAh聽g^鈭? at 200聽mA聽g^鈭? and 60聽mAh聽g^鈭? at 400聽mA聽g^鈭? with excellent cyclic stability in 50聽cycles.