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Hydrophobic electrode, preparation method thereof and battery

An electrode and hydrophobic technology, applied in battery electrodes, circuits, fuel cell half-cells and primary battery half-cells, etc., can solve problems such as complex operation, inability to apply large-scale industrial production, and difficulty in control, etc. Dissolution, excellent cycle performance and safety performance, effect of improving cycle stability

Active Publication Date: 2020-11-27
REHAB ENERGY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the formation of nano-protrusion lines usually requires the simultaneous use of laser etching and rolling with a roller press. The operation is complicated and difficult to control, and cannot be applied to industrial production on a large scale.

Method used

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  • Hydrophobic electrode, preparation method thereof and battery
  • Hydrophobic electrode, preparation method thereof and battery
  • Hydrophobic electrode, preparation method thereof and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Use metallic zinc as the negative electrode, and the active material of the positive electrode is MnO 2 (70wt%), acetylene black as a conductive agent (20wt%), polyvinylidene fluoride as a binder (10wt%), N-methyl-pyrrolidone as a solvent (the mass ratio of solvent to binder is 46:1) Stir it into a uniform slurry, and then coat the slurry on a conductive polyethylene film to form a slurry layer on the polyethylene film to form a positive pole piece. After the positive pole piece is vacuum dried at 60°C, Spin-coating a paraffin solution with a concentration of 1wt% on the surface of the dried positive pole piece (such as Figure 4 As shown in b), the spin coating speed is 1200r / min, and after drying again, a hydrophobic material layer is formed on the surface of the positive pole piece (the thickness of the hydrophobic material layer is 5μm). The contact angle test result of the hydrophobic material layer is as follows Figure 5 As shown in b, it is then immersed in ZnSO wi...

Embodiment 2

[0050] Except that the hydrophobic material is changed to epoxy resin and the concentration of the epoxy resin-containing slurry is 1 wt%, the thickness of the hydrophobic material layer is 3.5 μm, and the conductive electrode sheet is graphite foil, other preparation conditions and test conditions are the same as those in Example 1. the same. After charging and discharging at a constant current of 100mA / g for 4 times and then charging and discharging with a constant current of 500mA / g for 1000 times, the capacity decays to 24%.

Embodiment 3

[0052] Except for the positive active material changed to ZnMn 2 O 4 , Other preparation conditions are the same as in Example 1, to obtain a paraffin-coated ZnMn with zinc as the negative electrode 2 O 4 It is a positive secondary battery. The test conditions are also the same as in Example 1. According to the test results, it is also obtained that the capacity decay ratio after 1000 cycles after activation is 22%.

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Abstract

The invention discloses a hydrophobic electrode, a preparation method thereof and a battery. The hydrophobic electrode comprises an electrode substrate and a hydrophobic material layer, and the hydrophobic material layer is arranged on at least one part of the surface of the electrode substrate. The hydrophobic electrode has excellent cycle stability, so that the battery loaded with the hydrophobic electrode has excellent cycle performance, safety performance and capacity retention rate.

Description

Technical field [0001] The invention belongs to the field of batteries, and specifically relates to a hydrophobic electrode, a preparation method thereof, and a battery. Background technique [0002] In the field of electrochemical energy storage, the current treatment method for the hydrophobic effect on the surface of the air electrode is mainly to form a neat nano-protruding pattern on the surface of the carbon film to change the surface tension of the air electrode. The formation of nano-protruding lines usually requires both a laser etching method and a roller pressing method, which is complicated in operation, difficult to control, and cannot be applied to industrial production on a large scale. [0003] Therefore, the hydrophobic method of the existing electrode needs to be improved. Summary of the invention [0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an object of the present invent...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M12/06
CPCH01M4/8657H01M4/8825H01M12/06Y02E60/10
Inventor 刘昱陈璞
Owner REHAB ENERGY INC