Electrochemical Performance of Nickel Hydroxide/Activated Carbon Supercapacitors Using a Modified Polyvinyl Alcohol Based Alkaline Polymer Electrolyte

Polyvinyl alcohol （PVA）-sodium polyacrylate （PAAS）-KOH-H2O alkaline polymer electrolyte film with high ionic conductivity was prepared by a solution-casting method. Polymer Ni（OH）2/activated carbon （AC） hybrid supercapacitors with different electrode active material mass ratios （positive to negative） were fabricated using this alkaline polymer electrolyte, nickel hydroxide positive electrodes, and AC negative electrodes. Galvanostatic charge/ discharge and electrochemical impedance spectroscopy （EIS） methods were used to study the electrochemical performance of the capacitors, such as charge/discharge specific capacitance, rate charge/discharge ability, and charge/discharge cyclic stability. Experimental results showed that with the decreasing of active material mass ratio m（Ni（OH）2）/m（AC）, the charge/discharge specific capacitance increases, but the rate charge/discharge ability and the charge/discharge cyclic stability decrease.

高利用率活性物质配方研究

介绍了特殊用途动力型铅酸蓄电池高利用率活性物质配方的研究,使用单片极板对正、负极活性物质添加剂进行了筛选,对正、负极板制造工艺进行了试验,在单片极板试验基础上确定了活性物质配方,通过样品电池对活性物质利用率进行了考核。活性物质利用率除了与其配方有关外,还受极板的高度、厚度的影响,所研究的活性物质配方,在极板高度达到一般牵引用铅酸蓄电池极板两倍的情况下,活性物质利用率仍高于一般的牵引用铅酸蓄电池。

通信用阀控式铅酸蓄电池供电可靠性的讨论

阀控式铅酸蓄电池(VRLA)是目前支持通信系统工作的主要备用电源。VRLA电池在浮充条件下的缺点已在国际会议上经过多次专题讨论。国内用户的反映是,当市电发生故障时,电池单体放电容量往往达不到设计要求。本文分析了一些影响电池可靠性的重要因素,提议在使用维护过程中改变充电方式,并在选购产品时要注重电池的基本性质。