Flexible battery negative electrode and preparation method thereof, flexible battery
A flexible battery and negative active material technology, applied in battery electrodes, electrolyte battery manufacturing, electrode carrier/current collector, etc., can solve the problems affecting battery cyclability, displacement, cracking, etc., to improve cycle stability and improve cycle performance , the effect of inhibiting initiation and expansion
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[0063] In the second aspect, the embodiment of the present application provides the first method for preparing a flexible battery negative electrode, comprising the following steps: providing a flexible substrate; preparing a transition layer on the flexible substrate; preparing a negative electrode active material layer on the surface of the transition layer; wherein , the transition layer is a mixed material layer formed by negative electrode active materials and conductive materials capable of preparing current collectors; and along the direction from the flexible substrate to the negative electrode active material layer, in the transition layer, the conductive material The content of the negative electrode active material is gradually decreased, and the content of the negative electrode active material is gradually increased.
[0064] In some embodiments, the preparation method of the flexible battery negative electrode includes the following steps:
[0065] S01. providing...
Embodiment 1
[0142] A flexible battery negative electrode based on a silicon active material, the flexible battery negative electrode includes a flexible base, a conductive layer combined on one side of the flexible base, a transition layer combined on the side of the conductive layer away from the flexible base, and a transition layer combined on the side away from the flexible base. a negative electrode active material layer on the substrate side;
[0143] Wherein, the flexible substrate is a polyamide fiber fabric; the material of the conductive layer is copper; the transition layer is a mixed material layer formed of copper and silicon; and along the direction from the flexible substrate to the negative electrode active material layer, In the transition layer, the content of copper gradually decreases, and the content of silicon gradually increases; in the cross section of the fiber fabric perpendicular to the fiber length direction, the negative electrode active material layer is cresc...
Embodiment 2-8
[0150] The difference between embodiment 2-8 and embodiment 1 is that embodiment 2-7 adopts polyester fiber, polyamide fiber, polyacrylonitrile fiber, polyvinyl formal fiber, polyvinyl chloride fiber, polyurethane elastic fiber respectively , polyolefin elastic fiber, and conductive carbon fiber are used as flexible base layer materials.
[0151] The flexible negative electrodes prepared in Examples 1-8 were subjected to composition, structural characterization and bending performance tests, and the test results are shown in Table 1 below:
[0152] Table 1
[0153]
[0154]
[0155] In order to illustrate the flexibility of the flexible silicon negative electrode and the excellent film-based bonding strength between the various parts, this example uses a bending test device ( Figure 5 ) to perform a bending test on the flexible silicon negative electrode. In order to better illustrate the good bending resistance of the flexible silicon negative electrode prepared in th...
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