Silicon (Si), a high-capacity lithium-ion battery anode material, has aroused wide attention. Its further practical application has been limited by its huge volume change during the cycle. To reduce this defect, the double cross-linked product of glycinamide hydrochloride modified poly(acrylic acid) (PAG) and epoxidized natural rubber (ENR) was developed as a water-based binder to obtain sufficient elasticity and a sufficiently strong adhesive force. Due to the double crosslinked structures in the system, the binder was enabled to effectively disperse and transfer the stress generated by the volume expansion of the Si particles and keep the integrity of the electrode during the cycle, thus obtaining excellent cycle performance. When the current density was 1 A g −1 , PE55 (PAG: ENR = 1:1 cross-linked polymer) electrode still achieved a specific capacity of 2322.2 mAh g −1 after 100 cycles of constant current charge and discharge, and PE55 binder exhibited excellent bonding properties (4.45 N) and mechanical properties (stress: 5.51 MPa, strain: 87.4%). The comparison of poly(acrylic acid) (PAA) electrodes suggests that the introduction of elastic polymer and the construction of double cross-linked structures can increase the stability of Si anodes.
A flame retardant thermoplastic polyurethane (TPU) was prepared using the silicon based (Si)-intumescent (IFR) synergistic flame-retardant system, which combined the advantages of additive and reactive types. Silicone rubber was introduced into the matrix of hydroxybutanyl terminated polydimethylsiloxane (PDMS) block TPU via dynamic vulcanization, which enabled the combination of silicon based material and TPU. Then, the IFR system was used to supplement the defects of single Si based flame retardancy, which realized the synergistic flame retardancy of Si-IFR. Under the Si-IFR system, when IFR uses 15%, the TPU reached the V-0 flame retardant level and the limiting oxygen index was 29.6. Moreover, the toughness of the Si-IFR flame-retardant TPU was better than PDMS block TPU. The silicon based material improved the matrix and cooperated with IFR to form a composite carbon layer, which protected the inner material, enhanced the strength of the carbon layer and eliminated dropping.
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