Wang Shuai, Huang Shuo, Yao Minjie, Zhang Yan, Niu Zhiqiang
Key Laboratory of Advanced Energy Materials Chemistry, (Ministry of Education), Renewable Energy Conversion and Storage Center, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China.
Angew Chem Int Ed Engl. 2020 Jul 13;59(29):11800-11807. doi: 10.1002/anie.202002132. Epub 2020 May 20.
The reversible capacity of AlCl intercalation/de-intercalation in conventional cathodes of aluminum-ion batteries (AIBs) is difficult to improve due to the large size of AlCl anions. Therefore, it is highly desirable to realize the intercalation/de-intercalation of smaller Al-based ions. Here, we fabricated polyaniline/single-walled carbon nanotubes (PANI/SWCNTs) composite films and protonated the PANI nanorods. The protonation endows PANI with more active sites and enhanced conductivity. Hyper self-protonated PANI (PANI(H )) exhibits reversible AlCl intercalation/de-intercalation during the discharge/charge process. As a result, the discharge capacity of the Al/PANI(H ) battery is twice as high as that of the initial composite films. PANI(H )@SWCNT electrodes also have a stable cycling life with only 0.003 % capacity decay per cycle over 8000 cycles. Owing to the excellent mechanical properties, PANI(H )@SWCNT composite films can act as the electrodes of flexible AIBs.
由于AlCl⁻阴离子尺寸较大，铝离子电池（AIBs）传统阴极中AlCl⁻嵌入/脱嵌的可逆容量难以提高。因此，非常希望实现较小铝基离子的嵌入/脱嵌。在此，我们制备了聚苯胺/单壁碳纳米管（PANI/SWCNTs）复合薄膜，并对PANI纳米棒进行了质子化处理。质子化赋予PANI更多活性位点并提高了导电性。超自质子化聚苯胺（PANI(H⁺)）在放电/充电过程中表现出可逆的AlCl⁻嵌入/脱嵌。结果，Al/PANI(H⁺)电池的放电容量是初始复合薄膜的两倍。PANI(H⁺)@SWCNT电极也具有稳定的循环寿命，在8000次循环中每循环容量衰减仅0.003%。由于具有优异的机械性能，PANI(H⁺)@SWCNT复合薄膜可作为柔性AIBs的电极。
