Bio‐Inspired Rose‐Like Bi@Nitrogen‐Enriched Carbon towards High‐Performance Lithium‐Ion Batteries

Abstract

Rose‐like Bi@N‐doped carbon nanocomposite was fabricate by a facile hydrothermal method, followed by polydopamine coating for different time and subsequent carbonization for the first time. Structural and morphological characterization shows that Bi@N‐doped carbon nanocomposite have a homogeneous rose‐like structure, with crystallized Bi nanoparticles embedded homogeneously in the carbon matrix. The optimal Bi@N‐doped carbon nanocomposite used as anode for rechargeable lithium‐ion batteries (LIBs) presents a reversible capacity of 712 mAh g−1 for initial cycle at a current density of 200 mA g−1 and exhibits outstanding cyclability with a capacity of 535 mAh g−1 after 450 cycles at 200 mA g−1. The outstanding electrochemical performance of the Bi@N‐doped carbon nanocomposite can be ascribed to the synergetic effects of various factors including the unique rose‐like structure, nano‐sized Bi particles and nitrogen doping carbon matrices.

Bi Dots Confined by Functional Carbon as High‐Performance Anode for Lithium Ion Batteries

“…Figure 6d is the comparison histogram between porous Bi@P‐1/6 in this work and other reported Bi‐based anodes for LIBs, including BiPO 4 @G, rose‐like Bi@NC, egg‐carton Bi/C sheets, Bi@C core–shell NWs, and so on. [ 8–10,12,13,27,28,30,35,50 ] The specific comparison is shown in Table S1 (Supporting Information). Distinctly, porous Bi@PC‐1/6 composite presents great advantages in terms of high specific capacity and steady cyclic performance compared with most other Bi‐based composites.…”

“…Aim at overcoming these problems hereinbefore, the main two solutions reported are nanoarchitecture and bismuth/carbon composite construction. [ 9,14,20–26 ] And up to now different composites have been designed, such as core–shell Bi@C nanowires, [ 10 ] yolk–shell Bi@C‐N nanorods, [ 8 ] Bi/CNFs, [ 27 ] Bi@C spheres, [ 13 ] Bi nanosheet/CFC, [ 20 ] rose‐liked Bi/C composite [ 28 ] and so on. Although the reported materials are mainly in well‐designed structures, the complex and tedious preparation process and the low yield are impeditive for further practical application.…”

Bi‐Based Electrode Materials for Alkali Metal‐Ion Batteries

“…In regard to the Li-ion storage mechanism of metallic Bi, the detailed alloying reactions are unanimously considered as follows [48][49][50][51][52] Discharge:…”

“…To the best of our knowledge, polydopamine (PDA) is a common precursor of N-doped carbon. Lan et al [48] synthesized Roselike Bi@N-doped carbon nanocomposite for the first time. By optimizing PDA coating times, Bi@N-C48 demonstrated a superior specific capacity of 535 mAh g −1 at 200 mA g −1 after 450 cycles, which can be ascribed to the synergetic effects including flower-like structure with a large specific surface area, nanosized Bi particles with shortened Li + diffusion path and N-doped carbon matrix with higher electrical conductivity.…”

“…In regard to the Li‐ion storage mechanism of metallic Bi, the detailed alloying reactions are unanimously considered as follows [ 48–52 ] …”