Reducing Water Exchange by Polyacrylic Acid Based Water‐Vapor‐Resistant Membrane in Zinc/Air Battery
Reducing Water Exchange by Polyacrylic Acid Based Water‐Vapor‐Resistant Membrane in Zinc/Air Battery
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DOI：
10.1002/slct.202203470
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发表时间：
2022-11
期刊：
影响因子：
2.1
通讯作者：
Ziheng Jing;Zhao Yan;Xueliang Wang;R. Che;E. Wang
中科院分区：
文献类型：
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作者：
Ziheng Jing;Zhao Yan;Xueliang Wang;R. Che;E. Wang
锌/空气电池因其低成本、高安全性和高能量密度等优点而受到广泛关注。但锌/空气电池在实际环境中运行时，会发生电池与环境之间的水交换，影响电池的比容量和使用寿命。本文以吸水性聚丙烯酸为基材，制备了高相对湿度的抗水蒸气膜。利用该膜，通过气体扩散电极降低了湿度梯度，有效地减少了水的交换。当PAA湿膜厚度为150 μm时，水蒸气透过率（WVTR）降至空白的51%。在电流密度为20 mA cm−2时，锌/空气电池的放电电压平台为1.10 V，比容量为612.5 mAh g−1，比未使用PAA膜的电池放电性能提高了33.8%。
Zinc/air batteries have received extensive attention due to their low cost, high safety, and high energy density. However, as the zinc/air battery is operated in the practical environment, water exchange between the battery and the environment occurs and affects the specific capacity and service life of the battery. In this paper, high relative‐humidity water‐vapor‐resistant membrane is prepared based on water‐absorbent polyacrylic acid. Using this membrane, water exchange is effectively reduced due to the decreased humidity gradient through gas diffusion electrode. When the thickness of the PAA wet film is 150 μm, the water vapor transmission rate (WVTR) reduced to 51 % of the blank. The excellent discharge performance of zinc/air battery is also achieved with the discharge voltage plateau of 1.10 V and the specific capacity of 612.5 mAh g−1under the current density of 20 mA cm−2, which is 33.8 % higher than that without PAA membrane.