A Flexible and Boron-Doped Carbon Nanotube Film for High-Performance Li Storage

Abstract

Boron-doped carbon nanotubes are a promising candidate for Li storage due to the unique electronic structure and high crystallinity brought by the boron dopants. However, the relatively low Li storage capacity has limited its application in the electrochemical energy storage field, which is mainly caused by the predominantly intact graphitic structure on their surface with limited access points for Li ion entering. Herein, we report a novel B-doped CNTs (py-B-CNTs) film, in which the CNTs possess intrinsically rough surface but flat internal graphitic structure. When used as a flexible anode material for LIBs, this py-B-CNTs film delivers significantly enhanced capacity than the conventional B-doped CNTs or the pristine CNTs films, with good rate capability and excellent cycling performance as well. Moreover, this flexible film also possesses excellent mechanical flexibility, making it capable of being used in a prototype flexible LIB with stable power output upon various bending states.

Review on carbonaceous materials and metal composites in deformable electrodes for flexible lithium-ion batteries

“…Thus, this process can be used for the measurement of R due to the bending condition is controlled by an automated machine with uniform distribution of stress and variation speed of bending angle that can be Fig. 8 Highest initial capacity at the certain current density of (a) CNT, [24][25][26]30,31,33,36,39,40,[42][43][44]48 (b) CNFs, 52,[55][56][57][58][59][60][62][63][64][65][66][67][68][69][70][71][72][73][74][75]77,78 (c) graphene, [85][86][87][90][91][92][93][94][95][96][97][98]…”

“…Light-weight and self-standing pyridine modified boron-doped CNT (Py-B-CNT) film anode materials for flexible LIBs are synthesized through the floating catalyst chemical vapor deposition (FCCVD) method. 30 The film can tolerate up to 50% strain without any fracture and can recover its initial state. Moreover, the anode exhibited a high initial discharge capacity (1182 mA h g −1 at 100 mA g −1 ), good rate performance (167 mA h g −1 at 2 A g −1 ), and excellent cyclic stability (548 mA h g −1 at 100 mA g −1 after 300 cycles).…”

Carbon Nanotubes: Applications to Energy Storage Devices

“…Brian et al, obtained highest capacity for SWCNT electrodes with using 1 M LiPF 6 in Ethylene carbonate: Propylene carbonate: Dimethyl carbonate (EC:PC:DMC) as the electrolyte and capacity retention is more than 95% after 10 cycles [55]. Researchers have using different surface functionalization and doping (N, B) processes for getting efficient Li ion storage in CNTs [56] and highly concentrated N doped CNTs was developed and presented reversible capacity of 494 mAh g −1 which is almost double conventional CNTs capacity [57]. On the other hand, when flexible and free-standing pyridin-B-CNTs film was prepared using one-step floating catalyst chemical vapor deposition method, it delivers high specific capacity with excellent cycle stability of 548 mAh g −1 after 300 cycles at 0.1 A g −1 [56].…”

Recent Developments of Two-Dimensional Anode Materials and Their Composites in Lithium-Ion Batteries

“…The diffusion of ions and electrons in 2D materials is almost independent of other conditions, which can transport rapidly in the channel. Therefore, 2D nanomaterials have gradually become promising candidates for LIBs. − …”