Multifunctional coating modified composite pole piece as well as preparation method and application thereof
A pole piece, electrode pole piece technology, applied in the field of composite pole piece and its preparation, can solve the problem that the effect is not very ideal, it is difficult to achieve high ionic conductivity, insulation, flame retardancy and high temperature closed cells at the same time, and it is difficult to take into account the coating. Adhesion to the substrate and other issues, to achieve high safety performance, excellent performance
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Embodiment 1
[0054] This embodiment provides a multifunctional coated composite pole piece with a total thickness of 151 μm, such as figure 1 As shown, its structure is:
[0055] Positive pole piece, the thickness of which is 137 μm;
[0056] A solid electrolyte layer, which is formed on both sides of the positive electrode sheet, with a thickness of 5 μm on one side;
[0057] A ceramic layer formed on the surface of the solid electrolyte layer, with a thickness of 2 μm on one side;
[0058] in:
[0059] The positive electrode sheet includes aluminum foil and a positive electrode active material layer; the positive electrode active material layer includes the following components by weight: 90 parts of positive electrode active material NCM811, 5 parts of conductive carbon black, and 5 parts of binder PVDF;
[0060] The solid electrolyte layer includes the following components by weight: 300 parts of Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 Oxide electrolyte (LLZTO), 7.7 parts of PVDF, 10.2 ...
Embodiment 2
[0098] This embodiment provides a 20Ah soft pack battery, which differs from Embodiment 1 only in that the electrolyte in the solid electrolyte layer is glassy 75Li 2 S-25P 2 S 5 sulfide electrolyte.
[0099] According to the GB / T31485-2015 standard, the heating test and acupuncture test were carried out; the results are shown in Table 1.
[0100] At the same time, the battery was cut into 12mm discs, rolled, weighed, dried in a vacuum oven at 200°C for 12 hours, and the button half-cells were assembled to test the electrical properties;
[0101] The results showed that: 0.1C, the specific capacity was 195.0mAh / g, the first effect was 88.1%, and the capacity retention rate was 86.2% after 100 cycles.
Embodiment 3
[0103] This embodiment provides a 20Ah pouch battery, which differs from Embodiment 1 only in that:
[0104] (1) The thickness of one side of the solid electrolyte layer is 3 μm;
[0105] (2) Increase the thickness of the PE separator to ensure that the total thickness of the battery obtained is equal to that of the battery in Example 1.
[0106] According to the GB / T31485-2015 standard, the heating test and acupuncture test were carried out; the results are shown in Table 1.
[0107] At the same time, the battery was cut into 12mm discs, rolled, weighed, dried in a vacuum oven at 200°C for 12 hours, and the button half-cells were assembled to test the electrical properties;
[0108] The results showed that: 0.1C, the specific capacity was 196.3mAh / g, the first effect was 88.4%, and the capacity retention rate was 90% after 100 cycles.
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Abstract
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