高体积比容量二氧化锰半固态液流电池的研究

二氧化锰(MnO_(2))具有储量丰富、成本低廉等优点,被广泛应用于水系锌锰电池中。液流电池可以实现能量组件与功率组件的解耦,在长时规模储能领域受到研究者们的广泛关注。研究以MnO_(2)为活性物质设计了半固态电极,实现了高体积比容量的液流电池。首先以黄原胶为悬浮介质、科琴黑为导电剂制备了半固态电极,并通过表征电极的电化学性能与流变性能来确定MnO_(2)半固态电极的最佳配比。科琴黑导电渗透的临界浓度为9 g/L,以此浓度制备的半固态电极具有良好的倍率性能和循环稳定性,MnO_(2)添加浓度为300 g/L时,半固态电极体积比容量达到32.5 Ah/L。半固态电极表现出非牛顿流变性,屈服应力约为2 Pa,保证悬浮液具有机械稳定性的同时降低了泵送的机械能损失。应用了半固态电极的锌锰液流电池体积比容量可达22.3 Ah/L,具有良好的发展前景。

半固态储能电池的研究进展

半固态储能电池结合了可充电电池的高能量密度和液流电池设计灵活的优点,是一种新型电化学储能技术,近年来受到人们的广泛关注。通过综述半固态电池在锂离子电池、锂硫电池、锌电池、空气电池、有机电池及其他不同类型的储能电池领域的研究进展,并探究了半固态电极中的活性材料、导电剂、电解液及电池结构对半固态电池性能的影响,进而对半固态电极发展中存在的问题进行了分析和总结,发现通过开发新材料与新化学体系,可有效提高半固态电池的性能。最后提出展望,今后半固态电池的研究重点为提高电池能量密度、循环稳定性以及降低浆料黏度等。

Recycling of minute metal scraps by semisolid processing:Manufacturing of design materials

As a new attempt to recycle minute metal scraps, the possibility of manufacturing design materials by semisolid extrusion processing was shown.A design material with an intended shape, such as a character or petal shape, was manufactured using minute metal scraps.Similarly, a design material with an intended color pattern for each metal, such as red copper in a white aluminum matrix, resembling grainlike wood, was manufactured by mixing two or more types of minute metal scrap.In addition, secondary design materials, which have engraved patterns on the surface of the target metal made by an electric discharge machine using the above primary design material as an electrode, were manufactured.