Functionalized carbon nanotube doped gel electrolytes with enhanced mechanical and electrical properties for battery applications
Functionalized carbon nanotube doped gel electrolytes with enhanced mechanical and electrical properties for battery applications
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DOI：
10.1016/j.matchemphys.2021.124448
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发表时间：
2021-03-03
影响因子：
4.6
通讯作者：
Mitra, Somenath
中科院分区：
文献类型：
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作者：
Karaman, Emine S.;Wang, Zhiqian;Mitra, Somenath
我们报道了功能化碳纳米管（fCNTs）和氧化石墨烯（GO）掺杂聚乙烯醇（PVA）基凝胶电解质（GEs）。采用微波辐照处理多壁碳纳米管（CNTs），改变其羧基化程度。与纯GE和氧化石墨烯掺杂凝胶电解质（GOGE）相比，fCNT掺杂凝胶电解质（fCNTGE）的离子电导率、机械强度和电化学稳定性均有显著提高。fCNTs提供的均匀分布的离子通道起到了氧化还原穿梭的作用，促进了离子在凝胶中的迁移。当氧含量为12.8%时，fCNTGE表现出最好的性能。通过在PVA凝胶中引入fCNTs，离子电导率显著提高，达到6.9 x 10(-2) S cm(-1)，表明离子在电解质中的扩散和输运比GE和GOGE要好得多。fCNTGE的杨氏模量（E = 2.3）和抗拉强度（22.3 kPa）均高于GE和GOGE，凝胶力学性能显著增强。此外，在3d打印电池外壳中使用fCNTGE、GE和GOGE制作并测试了复合Zn-Ag2O电池。fCNTGE基电池具有良好的电化学稳定性，比容量达到204.3 mAh g(-1) （C/20）。
We report the functionalized carbon nanotubes (fCNTs) and graphene oxide (GO) doped polyvinyl alcohol (PVA) based gel electrolytes (GEs). The multiwalled carbon nanotubes (CNTs) were treated via microwave irradiation to alter the degree of carboxylation. The fCNT doped gel electrolyte (fCNTGE) showed significantly improved ionic conductivity, mechanical strength as well as electrochemical stability when compared to the pure GE and graphene oxide doped gel electrolyte (GOGE). The homogeneous distribution of ionic channels provided by fCNTs served as redox shuttle and facilitated the ion migration in the gel. The fCNTGE exhibited the best performance when the oxygen content was 12.8% by weight. The ionic conductivity was significantly improved by introducing fCNTs into the PVA gel and reached 6.9 x 10(-2) S cm(-1), revealing that the diffusion and transport of ions into electrolyte were much better than the GE and GOGE. A significant enhancement in the gel mechanical properties was observed as the Young's module (E = 2.3) and tensile strength (22.3 kPa) of fCNTGE was higher than that of GE and GOGE. Furthermore, the composite Zn-Ag2O batteries were made and tested using the fCNTGE, GE, and GOGE in the 3D-printed battery casings. The fCNTGE based batteries demonstrated good electrochemical stability with specific capacity reaching 204.3 mAh g(-1) (C/20).