Zeng Xiangyu, Shi Yongji, Zhang Yu, Tang Ruixian, Wei Liangming
Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, Department of Microelectronics and Nanoscience, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China
RSC Adv. 2018 Aug 17;8(51):29230-29236. doi: 10.1039/c8ra04967j. eCollection 2018 Aug 14.
In order to effectively relieve the large volume changes of silicon anodes during the cycling process in lithium ion batteries (LIBs), we developed a vinyltriethoxysilane crosslinked poly(acrylic acid sodium) polymeric binder (PVTES-NaPAA) for the Si anodes. The PVTES-NaPAA binder was synthesized by using a free radical co-polymerization method with VTES and NaPAA as precursors. In this binder, NaPAA with carboxyl groups can provide strong adhesion between Si particles and the current collector. Furthermore, VTES can be hydrolyzed and condense with each other to form a three-dimensional crosslinked network; the special network makes it possible to improve the Si electrode stability, resulting in an excellent cycling performance (78.2% capacity retention after 100 cycles) and high coulombic efficiency (99.9% after 100 cycles).
为了有效缓解锂离子电池（LIBs）循环过程中硅阳极的大量体积变化，我们开发了一种用于硅阳极的乙烯基三乙氧基硅烷交联聚（丙烯酸钠）聚合物粘结剂（PVTES-NaPAA）。PVTES-NaPAA粘结剂是采用自由基共聚法，以VTES和NaPAA为前体合成的。在这种粘结剂中，含羧基的NaPAA可在硅颗粒与集流体之间提供强附着力。此外，VTES可相互水解并缩合形成三维交联网络；这种特殊网络使得提高硅电极稳定性成为可能，从而实现优异的循环性能（100次循环后容量保持率为78.2%）和高库仑效率（100次循环后为99.9%）。
