High-Safety and Long-Life Silicon-Based Lithium-Ion Batteries via a Multifunctional Binder

• DOI: 10.1021/acsami.0c17563
• Publication Date: 2020-11-20T20:40:58Z
• Authors: Hua Liu; Tongqing Chen; Zhixin Xu; Zuozhen Liu; Jun Yang; Jianding Chen
• Keywords: Current collector; Polyacrylic acid

Lithium-ion batteries with high energy density and good safety are in urgent demand nowadays. Silicon has the advantages of theoretical capacity, low cost, vast reserves. It is regarded as an ideal anode material for high-energy lithium-ion batteries. Unfortunately, its huge volume change during cycling results unstable cycle behavior limits application. To develop a robust electrode by employing effective binders still big challenge. Furthermore, both conventional organic liquid electrolytes bring serious risks due to their flammability. Herein, flame-retardant binder designed prepared cross-linking polyacrylic acid (PAA) epoxy resin (FREP) containing phosphorus nitrogen elements. Compared PAA, it better wettability electrolytes. Moreover, three-dimensional PAA-FREP polymer not only provides sufficient mechanical strength buffer Si powders but also enhances interfacial adhesion between active film Cu current collector via groups. Most importantly, FREP component leads admirable flame retardance. In these ways, multifunctional exhibits excellent mechanical, electrochemical, performances.