Hunter O. Ford, Brian L. Chaloux, Nishani K. Jayakody, Christopher A. Klug, Eric G. Ruzicka, Meghanne Tighe, Ryan H. DeBlock, Jeffrey W. Long, Debra R. Rolison and Megan Bourg Sassin*,
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引用次数: 0
摘要
本文报道了一种基于季铵化聚二甲氨基甲基苯乙烯(pDMAMS+)的交联单阴离子导电固态电解质(SSE)的合成及其性能。在基于pDMAMS+的均聚物SSE中,交联发生在带正电荷的铵离子位点,阻碍了离子的传输和电导率。为了提高离子导电性,我们现在报道了一种由DMAMS和二乙烯基苯(DVB)组成的共聚物体系。加入DVB将交联键移动到聚合物主链上,留下季铵离子及其配对阴离子,具有最大的动态自由度。我们利用电化学阻抗谱、核磁共振谱和小角和广角x射线散射来评估一系列具有不同DVB含量的p[DVB- dams]共聚物的结构-输运关系。我们的最佳组合物含有2.5 wt % DVB,在水合条件下提供1 mS cm-1的单离子OH -电导率,比水合均聚物pDMAMS+ SSE的0.01 mS cm-1有显著改善。所有共聚物组成均支持Zn-ZnO和Ag-Zn电化学还原氧化(氧化还原)化学反应,这证明了使用碱性单离子导电SSE制备Ag-Zn电池的可行性。恒流循环表明银在聚合物电解质中有一定的迁移,然而,通过从二维平面电极过渡到三维海绵电极,可以部分减轻银迁移的有害影响。这些有希望的结果为在碱性锌电池中使用单阴离子导电的ssi奠定了基础。
Single-Ion-Conducting Polymer Electrolytes for Rechargeable Alkaline Ag–Zn Batteries
Recently, we reported on the synthesis and performance of a cross-linked single-anion-conducting solid-state electrolyte (SSE) based on quaternized poly(dimethylaminomethylstyrene) (pDMAMS+) via initiated chemical vapor deposition (iCVD). In the homopolymer pDMAMS+-based SSE, the cross-linking occurs at the positively charged ammonium cation sites, hindering ion transport and conductivity. To improve ionic conductivity, we now report on a copolymer system, comprising DMAMS and divinylbenzene (DVB). Incorporating DVB moves the cross-links to the polymer backbone leaving the quaternary ammonium cation and its paired anion with maximal dynamic freedom. We evaluate the structure–transport relationships of a series of p[DVB-DMAMS] copolymers with varying DVB content using electrochemical impedance spectroscopy, nuclear magnetic resonance spectroscopy, and small- and wide-angle X-ray scattering. Our best composition containing 2.5 wt % DVB provides 1 mS cm–1 single-ion OH– conductivity under hydrated conditions, a significant improvement over the 0.01 mS cm–1 of the hydrated homopolymer pDMAMS+ SSE. All copolymer compositions support Zn–ZnO and Ag–Zn electrochemical reduction–oxidation (redox) chemistry, which demonstrates the feasibility of a Ag–Zn battery using an alkaline single-ion-conducting SSE. Galvanostatic cycling shows some transport of Ag through the polymer electrolyte, however the deleterious effects of Ag migration can be partially mitigated by transitioning from a two-dimensional (2D) planar electrode to a 3D sponge electrode. With these promising results, the foundation is laid for using single-anion-conducting SSEs within alkaline Zn batteries.
期刊介绍:
ACS Organic & Inorganic Au is an open access journal that publishes original experimental and theoretical/computational studies on organic organometallic inorganic crystal growth and engineering and organic process chemistry. Short letters comprehensive articles reviews and perspectives are welcome on topics that include:Organic chemistry Organometallic chemistry Inorganic Chemistry and Organic Process Chemistry.