ELECTROCHEMICAL DEVICE AND ELECTRONIC DEVICE

    公开(公告)号:US20250029998A1

    公开(公告)日:2025-01-23

    申请号:US18897304

    申请日:2024-09-26

    Abstract: An electrochemical device includes a negative electrode. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer includes a negative active material. The negative active material layer satisfies 0.1≤SA/S002≤0.3, where SA is a peak area value of an A peak corresponding to a diffraction angle 2θ of 42.4° to 43.6° in an XRD pattern of the negative active material layer, and S002 is a peak area value of a 002 peak in the XRD pattern of the negative active material layer. The electrochemical device has excellent cycle performance and kinetic performance in addition to a high gravimetric capacity.

    ELECTROCHEMICAL DEVICE AND ELECTRONIC DEVICE CONTAINING SAME

    公开(公告)号:US20240243285A1

    公开(公告)日:2024-07-18

    申请号:US18619837

    申请日:2024-03-28

    Abstract: An electrochemical device includes a positive electrode, a separator, an electrolyte solution, and a negative electrode. The negative electrode includes a negative current collector and a negative active material layer disposed on a surface of the negative current collector. The electrochemical device satisfies: A=W/(ID/IG), and 150≤A≤1000. As tested by differential scanning calorimetry, the negative active material layer exhibits an exothermic peak at a temperature ranging from a room temperature to 450° C. A peak area of the exothermic peak is W J/g. As tested by Raman spectroscopy, a ratio of a peak intensity at a wavenumber 1350 cm−1 to a peak intensity at a wavenumber 1580 cm−1 of the negative active material layer is ID/IG. The electrochemical device of this application achieves improved kinetic performance and cycle performance in addition to a high capacity.

    SECONDARY BATTERY AND ELECTRONIC APPARATUS

    公开(公告)号:US20250132339A1

    公开(公告)日:2025-04-24

    申请号:US19006425

    申请日:2024-12-31

    Abstract: A secondary battery includes a negative electrode, which includes a negative electrode current collector and a negative electrode active material layer disposed on the negative electrode current collector, and the negative electrode active material layer includes graphite particles. In a thickness direction of the negative electrode active material layer, a region from a surface of the negative electrode active material layer to a depth of 10 μm inside the negative electrode active material layer is a first region. The secondary battery satisfies 3≤m1/n1≤18 and 5%≤n1≤20%, wherein m1 is based on a number of graphite particles in the first region, a proportion of graphite particles in the first region with an angle of 0° to 20° between a longest diameter of the graphite particles and a direction of the negative electrode current collector, and n1 is a cross-sectional porosity of the first region.

    ANODE MATERIAL, ANODE AND ELECTROCHEMICAL DEVICE COMPRISING THE ANODE MATERIAL

    公开(公告)号:US20210351405A1

    公开(公告)日:2021-11-11

    申请号:US17281042

    申请日:2020-03-11

    Abstract: An anode material having 0.8≤0.06×(Dv50)2−2.5×Dv50+Dv99≤12 (1); and 1.2≤0.2×Dv50−0.006×(Dv50)2+BET≤5 (2), where Dv50 represents a value in the volume-based particle size distribution of the anode material that is greater than the particle size of 50% of the particles, Dv99 represents a value in the volume-based particle size distribution of the anode material that is greater than the particle size of 99% of the particles, and BET is a specific surface area of the anode material, wherein Dv50 and Dv99 are expressed in μm and BET is expressed in m2/g. The anode material is capable of significantly improving the rate performance of electrochemical devices.

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