A Web?like Three?dimensional Binder for Silicon Anode in Lithium?ion Batteries

Si anode is of paramount importance for advanced energy-dense lithium-ion batteries (LIBs). However, the large volume change as well stress generates during its lithiation-delithiation process poses a great challenge to long-term cycling and hindering application. Herein this work, composite binder prepared with soft component, guar gum (GG), rigid linear polymer, anionic polyacrylamide (APAM). Rich hydroxy, carboxyl, amide groups on polymer chains not only enable intermolecular crosslinking form web-like binder, A2G1, but also realize strong chemical binding physical encapsulating particles. The resultant electrode shows limited thickness merely 9% lithiation almost recovers original delithiation. It demonstrates high reversible capacity 2104.3 mAh g?1 after 100 cycles at current density 1800 mA g?1, in constant (1000 g?1) test, it long life 392 cycles. Therefore, soft-hard combining illustrates potential future applications.