A like-bulletproof glass structure flexibility-rigidity coating layer strategy for high-performance Li ion batteries Si anodes

In order to overcome the problems about the volume expansion and poor electronic conductivity of Si , a flexibility and rigidity double coating layer CNTs-rGO- PAIN was constructed. The CNTs-rGO-PANI network with porous structure and high electronic conductivity provides sufficient space to accommodate the volume change of Si, and abundant transmission path for electron and Li ion . Moreover, the coating network with flexibility and rigidity characteristic could absorb the expansion stress of Si, maintain electrode structural integrity, promote the growth of stable SEI . The polymer-nanocarbon network dual coating layer effectively safeguards the electrochemical-mechanical interplay within the electrode. The 20Si-CNTs-rGO-PANI exhibits a reversible capacity as high as 1856 mAh g −1 after 400 cycles at 0.2 A g −1 and a remarkable rate capacity of 570 and 459 mAh g −1 , at 5 and 10 A g −1 , respectively. The outstanding Li ion storage performance of 20Si-CNTs-rGO-PANI anode, suggests the flexibility-rigidity dual coating layer strategy is a potential way to improve the performance of alloy type anode .