Core–Shell Structure of a Polypyrrole-Coated Phosphorus/Carbon Nanotube Anode for High-Performance Lithium-Ion Batteries

Abstract

Black phosphorus is regarded as a promising anode material due to its high theoretical specific capacity and fast-charging safety compared with the commercial graphite-based anode materials. However, the practical application of a black phosphorus anode is constrained by the large volumetric variation, unstable electrode/electrolyte interface, and shuttle effect of soluble phosphorus intermediates. Herein, we fabricated a phosphorus/carbon nanotube@polypyrrole (BP/CNT@PPy) composite via a simple high-energy ball-milling (HEBM) and liquid polymerization method. When it was used as the anode material for lithium-ion batteries, the elastic and conductive PPy coating layer played an important role in buffering volume expansion, improving electrical conductivity, and maintaining the integrity of active materials. Thus, the BP/CNT@PPy electrode exhibits excellent cyclic stability. This work provides a favorable strategy to design a high-performance phosphorus anode for lithium-ion batteries.

Heterogeneous Atoms Substituted Rock Salt Phase Mn1‐xFexO Solid Solution with Rich Defects for Advanced Lithium‐Ion Batteries

“…When the current density returned to 0.1 A g –1 again, the capacity recovered almost completely, indicating excellent lithium storage kinetics of Mn 0.55 Fe 0.45 O. As shown in Figure 4d, compared with previously reported analogous literature, [ 7b,21a,b,25 ] the Mn 0.55 Fe 0.45 O electrode can obtain more outstanding rate performance.…”

“…In particular, carbon materials and their derivatives have played an important role in improving electrical conductivity and buffering volume changes of active materials. [ 4b,7 ] However, carbon coating generally suffers from increased additional costs and decreased mass‐energy density. From the viewpoint of internal modulation, many MnO nanostructures have been synthesized, including nanowires, [ 4b ] nanosheets, [ 4c ] and nanospheres.…”

Tannic acid-polypyrrole multifunctional coating layer enhancing the interface effect and efficient Li-ion transport of a phosphorus anode

“…S2a-d †). 7 Compared with PPy, the E b of P, LiP, Li 2 P, and Li 3 P with TA are 1.42 eV, 2.89 eV, 2.74 eV, and 2.97 eV, respectively (Fig. S2e-h †), exhibiting higher adsorption ability for Li x Ps (Fig.…”

“…To solve the problems of volume expansion and sluggish ionic transfer at the interface, Ji et al prepared a black phosphorus-graphite anode with a polyaniline coating layer, which delivered little change in electrode thickness and excellent high-rate performance. 6 In addition, polypyrrole 7 and polydopamine 8 also served as the coating layer to buffer the volume expansion of the phosphorus anode, resulting in enhanced electrochemical performance. The above polymers are all electrically conductive.…”

Bi Works as a Li Reservoir for Promoting the Fast‐Charging Performance of Phosphorus Anode for Li‐Ion Batteries

“…[12,13] To solve these problems, various carbon carriers and conductive polymer coating layers are usually introduced into P anode. [1][2][3][14][15][16][17][18] However, high Li diffusion barriers in carbon-based frameworks (0.34 eV) [19] and the heterogeneous interface, respectively, hinder the superior fastcharging performance of P-based composites. In addition, the problem of uneven local reaction in P particles has not been solved yet.Herein, to enhance the fast-charging performance, we introduced electrochemically active bismuth, a 2D layered material with a layer spacing of 0.396 nm, [20,21] into P/graphite (P/C) composite as a functional filler by the ball-milling method.…”