热电池MgO改性石棉纤维隔膜的研究  

Study on MgO modified asbestos paper separator for thermal batteries

作　　者：沈冬艳 杨少华[1] 骆柬氽 赵彦龙 余福山 

机构地区：[1]沈阳理工大学环境与化学工程学院,沈阳110159 [2]北方特种能源集团西安庆华公司,西安710025

出　　处：《功能材料》2015年第22期22054-22057,共4页Journal of Functional Materials

摘　　要：通过高温分解乙酸镁前驱体,制备了MgO改性的石棉纤维隔膜。将NiCl2薄膜正极、载有LiClLiBr-KBr的石棉隔膜和LiB负极组装成单体电池,研究了隔膜中MgO和电解质的载量及放电温度对单体电池放电性能的影响,并与传统粉末压片工艺制备的电解质片进行性能比较。实验结果表明,以MgO载量5.2mg/cm2、电解质载量53mg/cm2为隔膜的单体电池放电性能较好,其单体电池以50,100和200 mA/cm2恒流放电,放电起始电压分别为2.4557,2.4375和2.3285V,与粉末压片工艺制备的电解质片相比,电化学性能无明显差异。5个单体电池组装的热电池样机在100mA/cm2恒流放电下,最高电压为12.75V,对应最高电压80%的激活时间为0.26s,工作时间为110.0s,单体电池平均最高电压为2.55V。MgO modified asbestos paper was prepared by high temperature decomposition of magnesium acetate precursor and used as separator for thermal battery.A sing cell was fabricated with a NiCl2 film cathode,the modified asbestos paper loaded with an eutectic moten electrolyte LiCl-LiBr-KBr and a LiB anode.The influences of the loadings of MgO and electrolyte in the separator and operating temperature on the discharge performances of the single cells were studied.The results indicates that the single cell employing the separator with a MgO loading of 5.2mg/cm2 and an electrolyte loading of 53mg/cm2 shows the best discharge performance.And at current densities of 50,100 and 200mA/cm2,the respective cell voltage can reach 2.4557,2.4375and2.3285 V.The performance was comparable with that of the cell using the cold pressed electrolyte pellet.A thermal battery prototype with 5single cells was fabricated and at a discharge current density of 100mA/cm2,the obtained voltage rise-time was 0.26 sand working time was 110.0swith a cut-off voltage of its 80% peak voltage.

关 键 词：热电池 石棉纤维 电解质隔膜 MGO 

分 类 号：TM911[电气工程—电力电子与电力传动]