In Situ Growth of CoP₃/Carbon Polyhedron/CoO/NF Nanoarrays as Binder‐Free Anode for Lithium‐Ion Batteries with Enhanced Specific Capacity

Abstract

Advanced functional materials enable lithium‐ion batteries to reach high specific capacity. To achieve this goal, nickel foam (NF), as current collector, is chosen to in situ form aligned nanoarrays composed of CoP3/carbon polyhedron (CP)/CoO. The CoO nanowire acts as bridge to link NF and CoP3/CP which not only reinforces the adhesion between active material and NF but also enhances the capacity of whole electrode. Besides, CoP3 is evenly coupled with CP, which can effectively buffer the volume expansion of CoP3 during the charge/discharge process. Moreover, the novel architecture of CoP3/CP/CoO/NF is beneficial to improve the electronic conductivity. As a result, the CoP3/CP/CoO/NF anode delivers an ultrahigh specific capacity of 1715 mAh g−1 at 0.5 A g−1 which can remain at 1150 mAh g−1 after 80 cycles, demonstrating the good durability. Thus, this work develops a facile strategy to design self‐supporting electrodes for an enhanced energy storage device.

In situ growth of CoO nanosheets on a carbon fiber derived from corn cellulose as an advanced hybrid anode for lithium-ion batteries

“…Unfortunately, it has a low specific capacity of 372 mA h g −1 , which cannot satisfy the demands of high-power LIBs. 6,7 Recently, carbon allotropes, such as spherical fullerenes, graphenes and carbon nanotubes, have been targeted as high-performance anodes owing to their high electrical conductivity, excellent chemical properties, large specific surface area and tuneable structures. 8,9 However, the preparation of these carbon materials is often based on very complex processes, which are neither economical nor environmentally friendly.…”

A Spinel Tin Ferrite with High Lattice-Oxygen Anchored on Graphene-like Porous Carbon Networks for Lithium-Ion Batteries with Super Cycle Stability and Ultra-fast Rate Performances

“…41 The semicircle diameter of the SFO@C-IV electrode in the H-MF region is much smaller than that of the other four samples, which means that the proper carbon content, oxygen vacancy, and small SFO particle size jointly made the SFO@C-IV electrode have a lower charge transfer resistance. The diffusion coefficient of Li + (D Li + ) can be calculated by eq 7, as follows: 19,42,43 where R is the gas constant (8.314 J mol −1 k −1 ), T is the experimental temperature (K), A is the area of the electrode (here 1.1304 cm 2 ), n is the transferred electrons into 1 mol SnFe 2 O 4 @C molecule according to the ratio of SnFe 2 O 4 and C, F is the Faraday constant (96,500 C mol −1 ), c 0 is the molar concentration of lithium-ions in the electrode material (mol cm −3 ), and σ is the Warburg coefficient (Ω s −1/2 ) that is obtained from the slope of linear fitting of the relationship of the real impedance to the angular frequency at the LF region (Z re ∼ ω −1/2 ) by eq 8:…”

Stabilized Coralloid‐like CoP with N,P‐Codoped Carbon Shell on Carbon Paper for Enhanced Sodium Storage

“…Thereby, the specific capacity of metal phosphides presents rapidly decaying along with cycling. In order to address the above problems, a general strategy to improve the electrochemical performance is to design rational nanostructures, such as nanowires, [4] nanorods, [5] nanosheets, [6] and hollow structures. [7,8] However, the existence of binder is unfavorable to improve the utilization of active materials to achieve high theoretical specific capacity.…”