In Situ Synthesis and Unprecedented Electrochemical Performance of Double Carbon Coated Cross-Linked Co₃O₄

Abstract

Improving the structural stability and the electron/ion diffusion rate across whole electrode particles is crucial for transition metal oxides as next-generation anodic materials in lithium ion batteries. Herein, we report a novel structure of double carbon coated Co3O4 cross-linked composite, where Co3O4 nanoparticle is in-situ covered by nitrogen-doped carbon and further connected by carbon nanotubes (Co3O4 NP@NC@CNTs). This double carbon coated Co3O4 NP@NC@CNTs framework not only endows a porous structure that can effectively accommodate the volume changes of Co3O4, but also provides multidimensional pathways for electronic/ionic diffusion in and among the Co3O4 nanoparticles. As expected, the Co3O4 NP@NC@CNTs electrode exhibits unprecedented lithium storage performance, with high reversible capacity of 1017 mAh g-1 after 500 cycles at 1 A g-1 , and very good capacity retention of 75%, even after 5000 cycles at 15 A g-1. The lithiation/delithiation process of Co3O4 NP@NC@CNTs is dominated by pesudocapacitive behavior, resulting in excellent rate performance and durable cycle stabiltiy. Electrochemical kinetics further reveals a decreased energy barrier for electron/ion transport, synergistically, contributes to its excellent lithium storage performance.

Ant-nest-like Cu2−xSe@C with biomimetic channels boosts the cycling performance for lithium storage

“…Slightly capacity loss was observed in the initial cycles, which was due to the irreversible formation of solid electrolyte interphase (SEI) film and the trapping of Li + in the cathode material. 18,25 After the initial activation at 0.1 A g -1 for 15 cycles, a clearly capacity increasing was observed until the 900 th cycle, with the discharge/charge capacity gradually climbed from 492/490 mAh g -1 (in the 16 th cycle) to 1431/1428 mAh g -1 (in the 900 th cycle). From the 900 th cycle onward the discharge/charge capacity of the AN-Cu 2-x Se@C became quite stable and maintained to be 1452 and 1449 mAh g -1 until the end of 1200 cycles.…”

“…17 Previously, we had designed a serious of tentacle-like structure based on metal-organic frameworks (MOF). 7,18 As a typical class of porous materials that containing metal ionic nodes and organic linkers, the tailorable structure of MOFs made their derivatives possible to show various structure and compositions which is crucial for the target synthesise of functional materials. With the aim of extending the lifespan of Cu 2-x Se, herein, we reported a novel structure of ant-nest-like Cu 2-x Se that coated with carbon layers on its outer surface (marked as AN-Cu 2-…”

Urchin-like NiCoP coated with a carbon layer as a high-performance electrode for all-solid-state asymmetric supercapacitors

“…The R ct is an important parameter for evaluating the reaction kinetic properties for electrode materials. 48 In the high-frequency range, the R ct value of NiCoP@C-ULAs (0.995 O) is lower than that of NiCo-ULAs (3.355 O) and Ni x Co 1Àx O@ C-ULAs (1.173 O), and equivalent to that of NiCoP-ULAs (0.986 O), which indicates that the NiCoP@C-ULAs has excellent conductivity and favors fast charge transfer during the electrochemical redox processes. In the low-frequency region, the diffusive resistance obtained from the slope of the straight line reflects the ion diffusion rate of the redox species in the electrolyte.…”

Biomass-Derived Graphitic Carbon/Co3O4 Nanocomposites with Pseudocapacitance for Lithium Storage

“…At present, nanoparticles combined with pseudocapacitance effect have been proved to effectively improve the capacity and rate performance of the Co 3 O 4 anode material in LIBs . However, nanoparticles with a high surface energy tend to self-aggregate, which increase the contact resistance among the particles and difficulty in controlling the volume change of the electrode, further resulting in the fast fading of the capacity. , In recent years, the most effective strategy to solve the above problems of the Co 3 O 4 nanomaterial has been to construct a mesoporous hybrid micro/nanostructure from carbon materials (such as graphene and carbon nanotubes). − The introduction of carbon increases the conductivity and specific surface area of anode materials. In particular, carbon materials can effectively inhibit the agglomeration of nanoparticles and mitigate the volume change throughout the charge/discharge process.…”