Yen-Ming Li, Mohammadjafar Momeni, Huy Nguyen Dang Duc, Suvi von Bahder, Friedrich Roth, Wolfram Münchgesang, Manfred Danziger, Winfried Voitus, Dominik Nuss, Cornelia Sennewald, Tilmann Leisegang
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引用次数: 0
摘要
本文介绍了一类新型的资源节约型锂离子电池用玻璃编织栅集流器(CC)。这些 CC 以超轻多丝玻璃丝为基础,通过卷对卷物理气相沉积工艺编织成栅格,并在其周围镀上一层薄金属(相当于 1 µm 厚的金属箔)。这样可以节省 > 90% 所需的铜和铝金属,并将 CC 的质量减少 > 80%。同时,使用石墨的阳极和使用钴酸锂活性材料的阴极的重力容量分别增加了 48% 和 14%,而完整电池的重力容量增加了 26%。因此,比能量可提高 25%。本文介绍了从制备 CC 和电极到电池的完整阳极和阴极制造工艺,并以纽扣电池的形式进行了演示。采用玻璃编织栅 CC 的纽扣电池在循环 300 次后,容量保持率达到 93%,库仑效率大于 99.9%,并具有更高的速率能力,直到 C 速率达到 3C。这项技术为设计具有锂电池和超锂电池专用表面特性的超轻 CC 提供了新的可能性。
Resource-efficient electrodes with metallized woven-glass-grid current collectors for lithium-ion batteries.
A novel class of resource-efficient, woven-glass-grid current collectors (CCs) for Li-ion batteries is introduced. These CCs are based on ultra-light multifilament glass threads, woven to a grid and surrounded with a thin metal layer (equivalent to a 1 µm-thick metal foil) in a roll-to-roll physical vapor deposition process. This saves > 90% of the required Cu and Al metals and reduces the mass of the CCs by > 80%. At the same time, the gravimetric capacity of anodes with graphite and cathodes with LiCoO2 active material increases by 48% and 14%, respectively, while full cells are characterized by an increase of 26%. Thus, the specific energy can be improved by 25%. A complete anode and cathode fabrication process from preparing the CCs and electrodes to cells is described and demonstrated in coin cell format. Coin cells with woven-glass-grid CCs achieved 300 cycles with a capacity retention of 93%, a Coulombic efficiency of > 99.9%, and a higher rate capability until a C-rate of 3C. This technology opens up new possibilities for designing ultralight CCs with dedicated surface properties for Li and beyond Li batteries.
期刊介绍:
ChemSusChem
Impact Factor (2016): 7.226
Scope:
Interdisciplinary journal
Focuses on research at the interface of chemistry and sustainability
Features the best research on sustainability and energy
Areas Covered:
Chemistry
Materials Science
Chemical Engineering
Biotechnology