当前位置: X-MOL 学术Adv. Mater. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Brushed Metals for Rechargeable Metal Batteries
Advanced Materials ( IF 29.4 ) Pub Date : 2022-06-16 , DOI: 10.1002/adma.202202668
Weiyin Chen 1 , Rodrigo V Salvatierra 1 , John T Li 1 , Duy X Luong 1, 2 , Jacob L Beckham 1 , Victor D Li 1 , Nghi La 1 , Jianan Xu 3 , James M Tour 1, 3, 4
Affiliation  

Battery designs are swiftly changing from metal-ion to rechargeable metal batteries. Theoretically, metals can deliver maximum anode capacity and enable cells with improved energy density. In practice, these advantages are only possible if the parasitic surface reactions associated with metal anodes are controlled. These undesirable surface reactions are responsible for many troublesome issues, like dendrite formation and accelerated consumption of active materials, which leads to anodes with low cycle life or even battery runaway. Here, a facile and solvent-free brushing method is reported to convert powders into films atop Li and Na metal foils. Benefiting from the reactivity of Li metal with these powder films, surface energy can be effectively tuned, thereby preventing parasitic reaction. In-operando study of P2S5-modified Li anodes in liquid electrolyte cells reveals a smoother electrode contour and more uniform metal electrodeposition and dissolution behavior. The P2S5-modified Li anodes sustain ultralow polarization in symmetric cell for >4000 h, 8× longer than bare Li anodes. The capacity retention is 70% higher when P2S5-modified Li anodes are paired with a practical LiFePO4 cathode (3.2 mAh cm−2) after 340 cycles. Brush coating opens a promising avenue to fabricate large-scale artificial solid-electrolyte-interphase directly on metals without the need for organic solvent.

中文翻译:

用于可充电金属电池的拉丝金属

电池设计正在迅速从金属离子电池转变为可充电金属电池。从理论上讲,金属可以提供最大的阳极容量并使电池具有更高的能量密度。在实践中,这些优势只有在与金属阳极相关的寄生表面反应得到控制时才有可能。这些不良的表面反应会导致许多麻烦的问题,例如枝晶的形成和活性材料的加速消耗,从而导致负极循环寿命低甚至电池失控。在这里,据报道,一种简便且无溶剂的刷涂方法可将粉末转化为锂和钠金属箔上的薄膜。受益于锂金属与这些粉末薄膜的反应性,可以有效地调节表面能,从而防止寄生反应。P 2的操作中研究液体电解质电池中的S 5改性锂负极显示出更平滑的电极轮廓和更均匀的金属电沉积和溶解行为。P 2 S 5修饰的锂负极在对称电池中维持超低极化> 4000 小时,比裸锂负极长约8倍。当 P 2 S 5改性的 Li 负极与实用的 LiFePO 4正极配对时,容量保持率提高了 70% ( 3.2 mAh cm -2) 340 次循环后。刷涂为直接在金属上制造大规模人造固体电解质界面开辟了一条有前途的途径,而无需有机溶剂。
更新日期:2022-06-16
down
wechat
bug