Jun 2 2020
华盛顿州立大学(WSU)和太平洋西北国家实验室(PNNL)研究人员创建了一种钠离子电池,可容纳尽可能多的能量和工作以及一些商业锂离子电池化学化学,从而使潜在可行的电池技术具有丰富的电池技术和便宜的材料。欧洲杯足球竞彩
该团队报告了钠离子电池迄今为止最好的结果之一。它能够提供类似于某些锂离子电池的容量,并成功充电,在1000个周期后保持其80%以上的充电。这项由WSU机械与材料工程学院教授Yuehe Lin领导的研究,PNNL的高级研究科学家小姐LI发表在《杂志》上,欧洲杯足球竞彩ACS能量信。
“这是钠离子电池的重大发展,”能源部电力办公室储能总监Imre Gyuk博士说,他在PNNL支持这项工作。“在许多应用中,用Na-ion替换锂离子电池的潜力引起了极大的兴趣。”
Lithium-ion batteries are ubiquitous, used in numerous applications such as cell phones, laptops, and electric vehicles. But they are made from materials, such as cobalt and lithium, that are rare, expensive, and found mostly outside the US. As demand for electric vehicles and electricity storage rises, these materials will become harder to get and possibly more expensive. Lithium-based batteries would also be problematic in meeting the tremendous growing demand for power grid energy storage.
另一方面,由廉价,丰富和可持续的钠制成的钠离子电池可以从地球的海洋或外壳中进行可持续的钠制成,可以成为大规模储能的好候选者。不幸的是,它们的能量不如锂电池。
They also have trouble being recharged as would be required for effective energy storage. A key problem for some of the most promising cathode materials is that a layer of inactive sodium crystals builds up at the surface of the cathode, stopping the flow of sodium ions and, consequently, killing the battery.
“关键的挑战是电池既具有高能量密度又具有良好的循环寿命”said Junhua Song, lead author on the paper and a WSU PhD graduate who is now at Lawrence Berkeley National Laboratory.
作为工作的一部分,研究团队创建了一个分层的金属氧化物阴极和一个液体电解质,其中包括额外的钠离子,从而产生了与阴极相互作用更好的盐汤。它们的阴极设计和电解质系统允许钠离子继续移动,防止表面晶体堆积不足并允许产生无动力。
“我们的研究揭示了阴极结构演化与与电解质的表面相互作用之间的基本相关性,”林说。“这些是用分层阴极的钠离子电池报道的最好的结果,这表明这是一种可与锂离子电池相媲美的可行技术。”
研究人员现在正在努力更好地了解其电解质和阴极之间的重要相互作用,因此他们可以使用不同的材料来改善电池设计。欧洲杯足球竞彩他们还想设计不使用钴的电池,这是另一种相对昂贵且稀有金属的电池。
"This work paves the way toward practical sodium-ion batteries, and the fundamental insights we gained about the cathode-electrolyte interaction shed light on how we might develop future cobalt-free or low cobalt cathode materials in sodium-ion batteries as well as in other types of battery chemistries,"宋说。“如果我们能找到可行的锂和钴替代品,那么钠离子电池可能确实与锂离子电池具有竞争力。
"And, that would be a game changer,"他加了。
Source:https://wsu.edu/