battery 18650

Analysis of technology for improving the battery 18650 storage capacity and rate performance of electrode materials

Transition metal compounds have a high theoretical battery 18650 storage capacity and are ideal electrode materials for battery 18650-ion batteries. However, their relatively poor conductivity and structural stability have largely limited their practical applications. Composite materials can utilize synergistic effects to improve the performance of materials. Studies have found that the appearance of phase interfaces in composite materials will lead to lattice mismatch, forming more active energy storage sites, and also facilitating the transfer of battery 18650 ions and electrons. Pseudocapacitive materials can store more energy on the surface and near the surface of materials through Faraday charge transfer, thereby increasing the battery 18650 storage capacity of active materials. [Brief introduction to the results] Recently, Professor Tong Yexiang, Associate Professor Song Shuqin and Dr. Muhammad-Sadeeq Balogun (corresponding author) of Sun Yat-sen University published a research paper entitled "Phase Boundary Derived Pseudocapacitance Enhanced Nickel-based Composites for Electrochemical Energy Storage Devices" in Adv. Energy Mater., reporting the latest research progress in phase boundary-induced pseudocapacitance-enhanced nickel-based composite electrochemical energy storage devices. The researchers prepared nickel nitride @ nickel sulfide (Ni3N@Ni3S2) nanosheet composites by annealing and sulfurization. The study found that the phase boundary between Ni3N and Ni3S2 is the key factor leading to the high battery 18650 storage capacity of the composite material. The excellent pseudocapacitive properties of Ni3N and the ideal diffusion-controlled capacity of Ni3S2 form a synergistic effect, which jointly improves the electrochemical energy storage performance of the composite material. Through the combination of interface mismatch and pseudocapacitive properties, the researchers provide a new reference for the design of high-performance electrochemical energy storage devices in the future. [Graphic Guide] Schematic diagram-1. Schematic diagram of the preparation process of the composite material

Figure-1. XRD and XPS spectra of samples (a) XRD diffraction spectra of Ni3N, Ni3N@Ni3S2, and Ni3S2; (b) High-resolution S2pXPS spectra of Ni3N, Ni3N@Ni3S2, and Ni3S2; (c) High-resolution N1sXPS spectra of Ni3N, Ni3N@Ni3S2, and Ni3S2. Figure 2. Electron microscope images and element distribution of samples

(a) Scanning electron microscope (SEM) image of Ni3N; (b) SEM image of Ni3N@Ni3S2; (c) Low-magnification transmission electron microscope (TEM) image of Ni3N@Ni3S2; (d) High-resolution transmission (HRTEM) image of Ni3N@Ni3S2. The inset is the selected area electron diffraction (SAED) diffraction pattern corresponding to the green box area; (e) HRTEM image of the yellow box area in Figure 2-(d) enlarged; (f) HRTEM image of the green box area in Figure 2-(d) enlarged; (g-j) EDS element distribution map of Ni3N@Ni3S2; (k) Overlay of element distribution of Ni, S, and N. Figure 3. Cyclic voltammetry (CV) curves of samples

(a) CV curves of the first three cycles of Ni3N at a scan rate of 0.1mV/s; (b) CV curves of the first three cycles of Ni3S2 at a scan rate of 0.1mV/s; (c) CV curves of the first three cycles of Ni3N@Ni3S2 at a scan rate of 0.1mV/s; (d) Comparison of the first cycle CV curves of Ni3N, Ni3N@Ni3S2, and Ni3S2. Figure 4. Electrochemical performance curves of samples

(a) First cycle charge-discharge curves of Ni3N, Ni3N@Ni3S2, and Ni3S2; (b) Second cycle charge-discharge curves of Ni3N, Ni3N@Ni3S2, and Ni3S2; (c) Specific lithiation capacity of the sample in the first and second cycles at low voltage (<0.5V); (d) Charge-discharge curves of Ni3N@Ni3S2 at different current densities. Figure 5. Impedance analysis, rate performance and cycle performance curves of samples

(a) Nyquist curves of Ni3N, Ni3N@Ni3S2 and Ni3S2 after cycling; (b) Rate performance of Ni3N, Ni3N@Ni3S2 and Ni3S2; (c) Cycle stability test curves of Ni3N, Ni3N@Ni3S2 and Ni3S2. Figure 6. CV curves and capacity contribution distribution of samples at different scan rates

(a) CV curves of Ni3N, Ni3N@Ni3S2 and Ni3S2 at a scan rate of 6mV/s; (b) CV curves of Ni3N@Ni3S2 at different scan rates; (c) Comparison of the contribution of capacitive capacity and diffusion-controlled capacity to the total capacity in Ni3N@Ni3S2 at a scan rate of 6mV/s; (d) Comparison of the contribution of capacitive capacity to the total capacity in Ni3N, Ni3N@Ni3S2 and Ni3S2 at different scan rates. Figure 7. Schematic diagram of the boundary of the interface energy storage mechanism

(a) Schematic diagram of the boundary of the interface energy storage mechanism in battery 18650-ion batteries;

(b) The actual process of the boundary of the interface energy storage mechanism in battery 18650-ion batteries.

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