【摘要】 采用水热法制备了球形氧化锌/石墨烯(S-ZnO/rGO)复合材料,首先采用水热法制备S-Zn O,再将氧化石墨(GO)和S-Zn O的混合水溶液在180℃下水热反应12 h,最终得到S-ZnO/rGO复合材料.以S-ZnO/rGO复合材料为铅酸蓄电池负极添加剂,探究了0.5%、1.0%、1.5%、2.0%这4种添加质量分数对铅酸电池电化学性能的影响.电化学测试结果表明:电池在高倍率部分荷电状态(HRPSoC)下的循环寿命随着复合材料添加质量分数的增加先增大后减小,其中掺入1.0%S-ZnO/rGO复合材料的电池在HRPSoC下循环性能最好,寿命可达19 158次,比普通铅酸蓄电池的寿命(7 210次)延长了165.7%.由此表明添加S-ZnO/rGO复合材料能够改善负极板的硫酸盐化现象,从而提高电池的循环稳定性.更多还原

【Abstract】 A simple and effective method was developed for preparing spherical zinc oxide/graphene( S-ZnO/rGO) composite material. In the synthesis process,GO prepared with the modified Humm3’ method was dissolved in deionized water and mixed with S-ZnO powder. Then,the homogeneous solution was transferred to 100 m L PTFE lined stainless-steel autoclave and put into an oven at 180 ℃ for 12 h. The product was obtained with freezedrying for 48 h. Subsequently,it was incorporated into the negative active materials at different dosages( 0.5%,1.0%,1.5% and 2.0%) to prepare lead-acid batteries. The electrochemical properties of the batteries were studied. According to the results,the cycle life of the battery under the high-rate partial-state-of-charge( HRPSoC)condition showed the trend of first increasing and then decreasing with the doping amount of the S-ZnO/rGO composites increasing. The battery with 1.0% S-ZnO/rGO composite exhibited the best performance of HRPSoC cycle life,reaching 19 158 cycles,and it was improved by more than 165% compared with that of the ordinary lead-acid battery( 7 210 cycles).更多还原