Lithium ion battery and preparation method thereof
A lithium-ion battery, the same technology, applied in battery electrodes, secondary batteries, circuits, etc., to achieve high charge-discharge efficiency, improved energy density, and good cycle stability.
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[0032] see figure 1 , a flow chart of the steps of the preparation method of the lithium-ion battery of an embodiment, comprising the following steps:
[0033] S110, providing fine and soft copper wires and first polymer fiber wires.
[0034] By providing fine and soft copper wire and the first polymer fiber wire, it can facilitate the subsequent weaving to obtain copper-plastic composite mesh. The copper-plastic composite mesh is moderately soft and hard, and has strong flexibility. It is not easy to break during the weaving process, and in the process of subsequent use It is convenient to bend or wind, which is conducive to the subsequent preparation of lithium-ion batteries with better performance.
[0035] In order to improve the softness of the copper-plastic composite mesh cloth, for example, the diameter of the fine soft copper wire is 0.08mm-0.6mm. It can be understood that the wire diameter of the soft copper wire has a great influence on the softness of the prepare...
Embodiment 1
[0074] (1) Provide soft copper wire and polyethylene terephthalate fiber wire;
[0075] (2) Weave fine soft copper wire and polyethylene terephthalate fiber wire into a copper-plastic composite mesh with a mesh number of 80 by plain weaving, in which the diameter wires are all polyethylene terephthalate The fiber wires and the weft wires are multiple thin soft copper wires and multiple polyethylene terephthalate fiber wires alternately arranged at intervals; copper metal is used as the target material, copper-plastic composite mesh is used as the base material, and the copper-plastic composite mesh is used as the base material. After the mesh cloth is ultrasonically cleaned, copper metal is deposited on the copper-plastic composite mesh cloth by vacuum evaporation, and the vacuum degree is 3×10 -3 Pa, the evaporation distance is 9cm, the evaporation current is 350A, the evaporation voltage is 2V, the evaporation time is 20min, and the composite copper foil is obtained;
[007...
Embodiment 2
[0083] (1) Provide soft copper wire and polyamide fiber wire;
[0084] (2) The fine soft copper wire and polyamide fiber wire are woven into a copper-plastic composite mesh cloth with a mesh number of 90 mesh by plain weaving method, in which the diameter wires are all polyamide fiber wires, and the weft wires are multiple soft copper wires and multiple wires. Polyamide fiber filaments are alternately arranged at intervals; copper metal is used as the target material, and copper-plastic composite mesh is used as the base material. After the copper-plastic composite mesh is ultrasonically cleaned, copper metal is deposited on the copper-plastic composite mesh by vacuum evaporation. cloth, where the vacuum is 4 x 10 -3 Pa, the evaporation distance is 10cm, the evaporation current is 350A, the evaporation voltage is 3V, the evaporation time is 25min, and the composite copper foil is obtained;
[0085] (3) coating the negative electrode slurry on the composite copper foil, drying...
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