Multiple hydrogel alginate binders for Si anodes of lithium-ion battery

• Published in: Electrochimica acta Vol. 245; pp. 371 - 378
• Main Authors: Wu, Zhan-Yu, Deng, Li, Li, Jun-Tao, Huang, Qi-Sen, Lu, Yan-Qiu, Liu, Jie, Zhang, Tao, Huang, Ling, Sun, Shi-Gang
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 10.08.2017; Elsevier BV
• Subjects: Acetylene; Aluminum; Anodes; Batteries; Binder; Chemical synthesis; Diamond pyramid hardness; Electrodes; Hydrogel alginate; Hydrogels; Ions; Lithium; Lithium-ion batteries; Lithium-ion battery; Manganese; Rechargeable batteries; Si anode; Viscosity; Lithium-ion battery; Binder; Hydrogel alginate; Si anode
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2017.05.094

[Display omitted] •A series of hydrogel alginate binder are synthesized and applied firstly on Si anode.•Al-alg and Ba-alg binders exhibit superior mechanical properties.•The electrodes with Al-alg and Ba-alg deliver capacities near 2100mAhg−1 after 300 cycles at 420mAg−1.•The electrode with Ba-alg shows superior cycle performance even at a low binder ratio of 10wt%. A series of hydrogel alginate binders (M-alg, M=Al, Ba, Mn, Zn) for Si anode of lithium ion battery are synthesized by coordinating alginate molecule chains with different cations respectively. Among these binders, Al-alg and Ba-alg both present their Vickers hardness higher than 32.0HV while other M-alg binders show Vickers hardness less than 25.5HV. The Ba-alg binder exhibits a viscosity of 30270 mPa s while other M-alg binders only show their viscosities less than 1700mPa s. The Si anodes with Al-alg or Ba-alg both deliver their capacities near 2100mAhg−1 after 300 cycles at 420mAg−1, while the electrodes with other M-alg binders show capacities less than 1500mAhg−1. When the current density is increased to 2100mAg−1 or the Si loading mass is increased to 1.0–1.2mgcm−2, the electrodes with Al-alg or Ba-alg still have remarkable advantages. Moreover, the ultrahigh viscosity makes Ba-alg strongly adhere with both Si and current collector, so when the electrodes are fabricated with a material mass ratio of 8:1:1 (Si: acetylene black: binder), the electrode with Ba-alg still delivers an outstanding capacity retention of 49.1% after 200 cycles at 840mAg−1.