Self-supporting diaphragm, preparation method thereof, composite pole piece and secondary battery
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A self-supporting, diaphragm technology, used in secondary batteries, battery pack parts, non-aqueous electrolyte battery electrodes, etc. Stability, improve practicability, reduce the effect of short positive and negative electrodes
Pending Publication Date: 2021-12-14
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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However, the polyolefin separator has high crystallinity, low surface energy, and low polarity, and has poor affinity, wettability, and liquid retention with the electrolyte, and poor contact with the surface of the positive and negative electrodes, which is likely to cause lithium ions The internal resistance of the battery increases, so the current polyolefin separator mostly uses a polyolefin separator coated with ceramics. Although the wettability and heat resistance of the electrolyte are improved after coating the ceramic layer, when the temperature reaches 130 ° C In the above cases, there will be a risk of hole breakage in the polyolefin separator, resulting in a short circuit between the positive and negative electrodes, causing the battery cell to ignite spontaneously, posing a safety hazard
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Embodiment 1
[0036] A method for preparing a self-supporting diaphragm 3, comprising the following steps:
[0037] Step (A): adding the ionic liquid into the first solvent and stirring evenly to obtain the first solution;
[0038] Step (B): adding lignocellulose to the second solution and grinding to obtain the second solution;
[0039] Step (C): adding the binder into the third solvent and stirring evenly to obtain the third solution;
[0040] Step (D): adding the second solution into the first solution and stirring evenly, adding the third solution and stirring evenly to obtain a mixed slurry; the prepared mixed slurry has a solid content of 40%.
[0041] Step (E): coating the mixed slurry on the surface of the carrier and drying to obtain the self-supporting membrane 3 .
[0042] Wherein, in step (B), a ball mill jar is used for grinding, the ball-to-material ratio for grinding is 50:1, and the rotation speed is 1032r / min.
[0043] Among them, the ionic liquid is [BMIM]BF 4 (1-butyl...
Embodiment 2
[0048] The difference with embodiment 1 is:
[0049] The weight ratio of ionic liquid, lignocellulose and binder is 50 parts: 40 parts: 10 parts.
[0050] The rest are the same as in Embodiment 1, and will not be repeated here.
Embodiment 3
[0052] The difference with embodiment 1 is:
[0053] The weight ratio of the ionic liquid, lignocellulose and binder is 40 parts: 50 parts: 10 parts.
[0054] The rest are the same as in Embodiment 1, and will not be repeated here.
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Abstract
The invention belongs to the technical field of secondary batteries, and particularly relates to a self-supporting diaphragm, a preparation method thereof, a composite pole piece and a secondary battery. The self-supporting diaphragm is prepared from, by weight, 40-60 parts of an ionic liquid, 30-50 parts of lignocellulose and 5-20 parts of a binder. The self-supporting diaphragm disclosed by the invention has good thermal stability, ionic conductivity, dimensional stability and wettability, the conditions of short positive and negative electrodes and spontaneous combustion of a battery cell under a high-temperature condition are greatly reduced, and the practicability of the diaphragm and the battery cell is improved.
Description
technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a self-supporting diaphragm, a preparation method thereof, a composite pole piece and a secondary battery. Background technique [0002] At present, due to the advantages of polyolefin separators such as light and thin film formation and good flexibility, most commercially used separators are polyolefin separators. However, the polyolefin separator has high crystallinity, low surface energy, and low polarity, and has poor affinity, wettability, and liquid retention with the electrolyte, and poor contact with the surface of the positive and negative electrodes, which is likely to cause lithium ions The internal resistance of the battery increases, so the current polyolefin separator mostly uses a polyolefin separator coated with ceramics. Although the wettability and heat resistance of the electrolyte are improved after coating the ceramic layer, when the t...
Claims
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