Tianjin Key Laboratory of Advanced Functional Porous Materials, New-Energy Materials and Low-Carbon Technologies, School of Materials Science and Engineering, Tianjin 300384, China.
Molecules. 2023 Feb 21;28(5):2024. doi: 10.3390/molecules28052024.
Lithium-air batteries (LABs) have attracted extensive attention due to their ultra-high energy density. At present, most LABs are operated in pure oxygen (O) since carbon dioxide (CO) under ambient air will participate in the battery reaction and generate an irreversible by-product of lithium carbonate (LiCO), which will seriously affect the performance of the battery. Here, to solve this problem, we propose to prepare a CO capture membrane (CCM) by loading activated carbon encapsulated with lithium hydroxide (LiOH@AC) onto activated carbon fiber felt (ACFF). The effect of the LiOH@AC loading amount on ACFF has been carefully investigated, and CCM has an ultra-high CO adsorption performance (137 cm g) and excellent O transmission performance by loading 80 wt% LiOH@AC onto ACFF. The optimized CCM is further applied as a paster on the outside of the LAB. As a result, the specific capacity performance of LAB displays a sharp increase from 27,948 to 36,252 mAh g, and the cycle time is extended from 220 h to 310 h operating in a 4% CO concentration environment. The concept of carbon capture paster opens a simple and direct way for LABs operating in the atmosphere.
锂空气电池（LAB）因其超高的能量密度而受到广泛关注。目前，大多数 LAB 都在纯氧（O）中运行，因为大气中的二氧化碳（CO）会参与电池反应并生成不可逆的碳酸锂（LiCO）副产物，这会严重影响电池的性能。在这里，为了解决这个问题，我们提出通过将负载有氢氧化锂（LiOH@AC）的活性炭封装在活性炭纤维毡（ACFF）上来制备 CO 捕获膜（CCM）。仔细研究了 LiOH@AC 负载量对 ACFF 的影响，并通过在 ACFF 上负载 80wt%的 LiOH@AC，CCM 具有超高的 CO 吸附性能（137cmg）和优异的 O 传输性能。优化后的 CCM 进一步作为贴纸应用于 LAB 的外部。结果，LAB 的比容量性能从 27948mAhg 急剧增加到 36252mAhg，循环时间从在 4%CO 浓度环境中运行的 220h 延长至 310h。碳捕获贴纸的概念为在大气中运行的 LAB 开辟了一种简单直接的方法。
