Jieda Wu

Bio: Jieda Wu is an academic researcher from Shenzhen Polytechnic. The author has contributed to research in topics: Lithium & Anode. The author has an hindex of 2, co-authored 3 publications receiving 8 citations.

Enhanced Electrochemical Performance of CNTs/α-Fe2O3/PPy Composite as Anode Material for Lithium Ion Batteries

Abstract: A novel CNTs/α-Fe2O3/PPy composite with three-dimensional interconnected network structure is successfully synthesized through a solvothermal method and in-situ polymerization. The as-synthesized C...

Preparation method of CA/nano Si/graphene composite negative electrode material of lithium ion battery

Abstract: The invention provides a preparation method of a CA/nano Si/graphene composite negative electrode material of a lithium ion battery. The method comprises the following steps: step 1: 1), dissolving nano silicon powder in a polar solvent to prepare a nano silicon liquid; 2) performing ultrasonic dispersion; and 3) adding a polyether hyperdispersant with multiple anchoring groups; step 2, mixing resorcinol and formaldehyde to prepare carbon aerogel; step 3, adding the carbon aerogel and the nano silicon liquid into deionized water, and magnetically stirring; and adding polyvinylpyrrolidone; step 4, transferring the mixture into a reaction kettle with a polytetrafluoroethylene lining, carrying out heat preservation treatment, cooling to room temperature, washing, carrying out heat preservation, and drying to obtain CA/nano silicon; step 5, dissolving the CA/nano silicon composite material in deionized water, stirring, adding lauryl sodium sulfate and graphene, and carrying out ultrasonic oscillation and magnetic stirring to obtain a solution D; and step 6, carrying out centrifugal separation on the solution D, washing, and carrying out vacuum drying. The method has potential application prospects in the fields of portable electronic equipment, electric vehicles and the like.

Graphene oxide wrapped Fe2O3 as a durable anode material for high-performance lithium-ion batteries

Abstract: Highlights • A flexible interleaved Fe 2 O 3 /graphene oxide hybrid are used as anode materials • Graphene oxide can act as flexible but mechanically strong buffer to ease the stress • Fe 2 O 3 /graphene oxide hybrid can provide the better performance • Mechanical tests were performed to confirm the possible mechanism Abstract Ferric oxide has demonstrated as a promising anode candidiate for lithium ion batteries (LIBs) due to large charge storage capacity, but its high cost, low Coulombic efficiency, and unstable solid-electrolyte interphase remain to be a technical challenge Here, we report a flexible interleaved hybrid in which Fe 2 O 3 nanoparticles were encapsulated by graphene oxide layers (Fe 2 O 3 /GO) using facile freeze-drying approach as anode for LIBs Within this flexible interleaved structure, GO layers act as flexible but mechanically strong buffer to accommodate volume expansion and reduce associated stress in Fe 2 O 3 nanoparticles, thereby maintaining mechanical integrity and increasing the cycling life of batteries With the synergistic effects from Fe 2 O 3 and GO, this hybrid not only promotes fast mass transfer and shortens the diffusion path of the Li ions but also forms a stable solid electrolyte interface, contributing improved Coulombic efficiency in the first few cycles The Fe 2 O 3 /GO hybrid as anode for LIBs exhibited a reversible specific capacity of ca 890 mAh g−1 after 50 cycles at 1 C (1005 mA g−1) and 405 mAh g−1 after 1000 cycles at 10 C rate Furthermore, a full-cell battery with a LiFePO4 cathode also showed high Coulombic efficiency and good capacity retention capability Mechanical properties and impedance spectroscopy tests were performed to confirm the mechanism in suerior rate and electrochemical stability The conclusions are considered to be very useful for design of Li batteries with improved mechanical performance

Construction of a High-Performance Three-Dimensional Structured NiCo2O4@PPy Nanosheet Array Free-Standing Electrode for a Hybrid Supercapacitor

Abstract: Asymmetric supercapacitors (ASCs) with free-standing electrodes have attracted extensive attention due to enhanced power density, high energy density, long-term stability, and low inner resistance....

Surfactant-assisted solvothermal synthesis of NiCo₂O₄ as an anode for lithium-ion batteries

Abstract: Binary metal oxides have been considered as promising anode materials, which exhibit much better performances than single metal oxides in view of their variable oxidation state and fairly high electrical conductivity. In this research, NiCo₂O₄ nanocrystals are prepared from a facile procedure including microemulsion-solvothermal reaction and subsequent calcination at 400 °C for 4 hours. The as-prepared NiCo₂O₄ nanocrystals are characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). When applied as an anode for a lithium ion battery, it demonstrates excellent cycling and rate stability. The initial charge/discharge efficiency is as high as 75.41% at a current density of 100 mA g⁻¹. After 45 cycles, the discharge capacity still retains up to 1175.9 mA h g⁻¹, which is even much higher than that of the initial discharge capacity. Meanwhile, the reversible capacity remains over 644.9 mA h g⁻¹ at a large current density of 1600 mA g⁻¹, ascribed to the dispersed nanoparticles, which will help to improve the conductivity of the electrode material during the lithium-ion insertion/deintercalation process, shorten the ion diffusion path and reduce the charge transfer resistance (Rcₜ).

Dielectric and Thermal Behavior of Polystyrene/Sr2TiMnO6 (STMO) Composites

Abstract: Materials with high dielectric permittivity are in demand due to their potential applications in microelectronics, capacitors and related fields. Polymer/ceramic composites, due to their improved p...