A Facile 3D Binding Approach for High Si Loading Anodes

作者：Bie, Yitian; Yang, Jun^*; Lu, Wei; Lei, Zhihong; Nuli, Yanna; Wang, Jiulin

来源：Electrochimica Acta, 2016, 212: 141-146.

DOI：10.1016/j.electacta.2016.06.152

• Silicon
• Binder
• Silane coupling agent
• Crosslinking
• Lithium-ion battery

Silicon is regarded as one of the most promising anode materials for Li-ion batteries owing to its high theoretical capacity (4200mA h g(-1), Li22Si5), but the short cycle life mainly caused by the dramatic volume effect has hindered its practical application. To address this major issue, we report here an effective and scalable approach to fabricate a novel Si electrode via the addition of silane coupling agent, which not only connects silicon and polyacrylic acid (PAA) covalently but also crosslinks PAA, thus forming an entire 3D binding network. The dual functions of 3-amino-propyltriethoxysilane (APTES) in an electrode with 80% Si nanoparticles greatly improves the structural stability during the charge/discharge process, leading to excellent electrochemical performances, such as 1000mAh g(-1) over 1200 cycles and high silicon loading of ca. 4.2mAh cm(-2). Moreover, this binder system is also effective for the thick silicon/graphite electrodes towards practical application.

• 出版日期2016-9-10
• 单位上海交通大学