Details

Autor(en) / Beteiligte

• Cao, Peng-Fei
• Yang, Guang
• Li, Bingrui
• Zhang, Yiman
• Zhao, Sheng
• Zhang, Shuo
• Erwin, Andrew
• Zhang, Zhengcheng
• Sokolov, Alexei P
• Nanda, Jagjit
• Saito, Tomonori

Titel

Rational Design of a Multifunctional Binder for High-Capacity Silicon-Based Anodes

Ist Teil von

• ACS energy letters, 2019-05, Vol.4 (5), p.1171-1180

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Although several principles have been recognized to fabricate a nominal “better” binder, there continues to be a lack of a rational design and synthesis approach that would meet the robust criteria required for silicon (Si) anodes. Herein, we report a synthetic polymer binder, i.e., catechol-functionalized chitosan cross-linked by glutaraldehyde (CS-CG+GA), that serves dual functionalities: (a) wetness-resistant adhesion capability via catechol grafting and (b) mechanical robustness via in situ formation of a three-dimensional (3D) network. A SiNP-based anode with a designed functional polymer network (CS-CG10%+6%GA) exhibits a capacity retention of 91.5% after 100 cycles (2144 ± 14 mAh/g). Properties that are traditionally considered to be advantageous, including stronger adhesion strength and higher mechanical robustness, do not always improve the binder performance. A clear relationship between these properties and ultimate electrochemical performance is established by assessing the rheological behavior, mechanical property, adhesion force, peel stress, morphology evolution, and semiquantitative evaluation. This study provides a clear path for the rational design of high-performance functional polymer binders for not only Si-based electrodes but also other types of alloy and conversion-based electrodes.