硅被认为是最有前景的锂离子电池负极材料之一。目前技术问题主要是硅在嵌锂时体积膨胀高达300%，反复充放电循环后，硅易碎裂和粉化，从集流体上脱落，从而导致电池容量衰减快、寿命短等问题。设计聚合物黏结剂是处理该问题的有效手段之一。黏结剂对于保持电极和导电网络的机械完整性十分重要。

本文提出将2-二甲基氨基甲基丙烯酸乙酯与不同比例甲基丙烯酸自由基聚合得到PD_mM_n，一种含有丰富羧基基团的链状结构聚合物，并将其用作硅电极的黏结材料，从而改善硅负极的循环性能。在此基础上，通过Ritter反应将其与聚乙烯醇进行交联，生成酰胺，进而对其进行表面修饰，获得高弹性、高附着力和高耐热的黏结材料，通过化学键与其它聚合物交联构建的网络化复合黏结剂具有更好的机械性能，有效提升电化学性能。

使用红外光谱、核磁氢谱、X射线光电子能谱技术等测试证明了交联之后聚合物中强极性基团酰胺结构的存在，再通过热重、差示扫描量热、剥离测试和恒电流充放电验证其黏结性能及电化学性能。结果表明，通过掺入不同比例的甲基丙烯酸，更有利于交联网络的设计和硅表面稳定的固体电解质界面膜的形成，可明显改善电池的循环性能。在该系列黏结剂中，高密度羧基基团对硅颗粒及铜的集流体都有很好的附着力。

Silicon is considered to be one of the most promising anode materials for lithium-ion batteries. The main technical problem at present is that silicon expands by up to 300% in volume when embedded in lithium, and after repeated charge and discharge cycles, silicon tends to fragment and pulverise and fall off the collector, leading to problems such as rapid battery capacity decay and short life. Designing polymer binders is one effective means of dealing with this problem. Binders are important to maintain the mechanical integrity of the electrodes and conductive network.

In this paper, we propose to polymerize 2-dimethylaminoethyl methacrylate with different ratios of methacrylic acid radicals to obtain PDmMn, a chain-like polymer rich in carboxyl groups, and use it as a binder material for silicon electrodes to improve the cycling performance of silicon anodes. On this basis, it was cross-linked with polyvinyl alcohol through the Ritter reaction to produce amides, which were then surface modified to obtain highly elastic, highly adhesive and heat resistant binder materials. The networked composite binder constructed by cross-linking with other polymers through chemical bonding has better mechanical properties and effectively improves electrochemical performance.

The presence of strong polar group amide structures in the polymer after cross-linking was demonstrated using Fourier transform infrared (FTIR) spectroscopies, 1H Nuclear magnet resonance (NMR) spectroscopies and X-ray photoelectron spectroscopies (XPS), followed by thermogravimetry analysis, differential scanning calorimetry, 180° peeling test and  galvanostatic charge/discharge to verify the adhesion performance and electrochemical properties. The results show that the design of the crosslinking network and the formation of a stable solid electrolyte interfacial film on the silicon surface are better facilitated by incorporating different proportions of methacrylic acid, which can significantly improve the cycling performance of the battery. In this series of binders, the high density carboxyl group has good adhesion to both silicon particles and copper collectors.