Water-soluble binders for electrode preparation offer advantages over traditional PVDF, including environmental benefits, improved electrochemical performance, and improved mechanical properties. The trend is to find environmentally friendly binders that are compatible with water-based processes. In this context, we designed and synthesized aqueous binders with three-dimensional crosslinked structures. These structures are based on highly branched, hydrophilic polyvinyl alcohol and lithium carboxymethyl cellulose, which facilitates Li+ transport. Furthermore, LiMn2O4/C/PVA-c-CMCLi film electrodes were prepared through covalent crosslinking. The film electrode was superior to the LiMn2O4/C/PVDF film electrode in terms of adsorption capacity (25.53 mg·g−1), but comparable to the LiMn2O4/C/PVDF film electrode in terms of cyclic stability (96.38 % capacity retention after 50 CV cycles). They also showed a shorter time to reach the adsorption equilibrium (2 h) and high selectivity for Li+ in simulated brine with a high Mg2+/Li+ ratio (40) from East Taijiner. This is attributed to the synergistic effects of the improved electrolyte wettability, enhanced adhesion strength through covalent crosslinking, and increased Li+ transport rate facilitated by -COOLi in CMCLi. These results indicate that this binder has the potential to replace PVDF in the preparation of film electrodes for extracting Li+ from brine with high Mg2+/Li+ ratios.

中文翻译：

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通过原位交联稳定的三维网络薄膜电极从盐湖盐水中选择性提取锂


与传统的 PVDF 相比，用于电极制备的水溶性粘合剂具有优势，包括环境效益、改进的电化学性能和改进的机械性能。趋势是寻找与水性工艺兼容的环保粘合剂。在此背景下，我们设计并合成了具有三维交联结构的水性粘合剂。这些结构基于高度支化的亲水性聚乙烯醇和羧甲基锂纤维素，可促进 Li+ 转运。此外，通过共价交联制备了 LiMn2O4/C/PVA-c-CMCLi 薄膜电极。薄膜电极在吸附容量 （25.53 mg·g-1） 方面优于 LiMn2O4/C/PVDF 薄膜电极，但在循环稳定性方面与 LiMn2O4/C/PVDF 薄膜电极相当（50 CV 循环后容量保持 96.38%）。他们还显示，在东台津尔高 Mg2+/Li+ 比率 （40） 的模拟盐水中，达到吸附平衡的时间更短 （2 h） 和对 Li+ 的高选择性。这归因于电解质润湿性改善、共价交联增强粘附强度以及 CMCLi 中 -COOLi 促进的 Li+ 转运速率增加的协同效应。这些结果表明，这种粘合剂有可能在制备薄膜电极时替代 PVDF，用于从高 Mg2+/Li+ 比率的盐水中提取 Li+。