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Lithium battery diaphragm ceramic slurry with high temperature resistance and preparation method thereof
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A ceramic slurry, high temperature resistance technology, used in lithium batteries, separators/films/diaphragms/spacers, circuits, etc., can solve problems such as poor dimensional stability, and achieve excellent heat resistance and coating technology. Simple, good heat resistant effect
Inactive Publication Date: 2019-02-12
SHANGHAI WEIKAI CHEM +1
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Problems solved by technology
The present invention prepares ceramic slurry by using high temperature-resistant ceramics with different dimensions to mix, and improves the disadvantage of poor dimensional stability of the diaphragm under high-temperature environment
Method used
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Embodiment 1
[0034] This embodiment provides a preparation method for lithium-ion battery separator slurry, the method comprising the following steps:
[0035] (1) First put all the solvents, i.e. 15 kg of ethanol and 40.3 kg of deionized water into the reactor, and stir for 10 min at 1500 rpm;
[0036] (2) Keep stirring and put 0.4 kg of sodium polyacrylate, 0.8 kg of wetting agent, 0.1 kg of defoamer, and 0.3 kg of rheological additive into the reactor at one time, and stir at 1500rpm for 15min;
[0037] (3) After mixing evenly, slowly put 5 kg of adhesiveemulsion into the reaction kettle and stir for 10 minutes;
[0038] (4) Put 30.4 kg of the first heat-resistant ceramic (alumina particles) and 7.6 kg of the second heat-resistant ceramic (siliconcarbidewhisker) into the reaction kettle, and stir at 1500rpm for 0.5h;
[0039] (5) Add 0.1 kg of thickener into the reaction kettle, and stir for 1 hour at 1500 rpm;
[0040] (6) After the slurry is mixed evenly, weigh and pack.
Embodiment 2
[0042] This embodiment provides a preparation method for lithium-ion battery separator slurry, the method comprising the following steps:
[0043] (1) First put all solvents, i.e. 15 kg of ethanol and 41.2 kg of deionized water into the reactor, and stir at 1500rpm for 10min;
[0044] (2) Keep stirring and put 0.4 kg of sodium polyacrylate, 0.8 kg of wetting agent, 0.1 kg of defoamer, and 0.3 kg of rheological additive into the reactor at one time, and stir at 1500rpm for 15min;
[0045] (3) After mixing evenly, slowly put 3.4 kg of adhesiveemulsion into the reaction kettle and stir for 10 minutes;
[0046] (4) Put 27.09 kg of the first heat-resistant ceramic (aluminawhisker) and 11.61 kg of the second heat-resistant ceramic (aluminum nitride particles) into the reaction kettle, and stir at 1500rpm for 0.5h;
[0047] (5) Add 0.1 kg of thickener into the reaction kettle, and stir for 1 hour at 1500 rpm;
[0048] (6) After the slurry is mixed evenly, weigh and pack.
Embodiment 3-7
[0050] Examples 3-7 respectively provide a slurry for lithium-ion battery separators, and the specific components and contents are shown in Table 1; the preparation method is the same as that of Example 1.
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Abstract
The invention provides lithium battery diaphragm ceramicslurry with high temperature resistance. The lithium battery diaphragm ceramicslurry is prepared from the following ingredients in parts by weight: 15 to 75 parts of heat-resistant ceramic, 3 to 10 parts of a bonding agent, 0.5 to 5 parts of an auxiliary agent and 40 to 65 parts of a solvent, wherein the heat-resistant ceramic is prepared from at least two of ceramic particles, ceramic crystalwhiskers and ceramic nanometer sheets. The lithium battery diaphragm ceramic slurry is applied to a lithium batterypolymer diaphragm; a formulaand a preparation method of the ceramic slurry with high temperature resistance are provided. The ceramic slurry coats a lithium battery diaphragm surface by a coating process. Compared with the priorart, the lithium battery diaphragm ceramic slurry has the advantages that the ceramic slurry is prepared from the same / different ceramics with different microtopography according to various proportions, so that the temperature resistance of a ceramic coating diaphragm is effectively improved; the dimensional change during the diaphragm heating is reduced; the short circuit generated when positiveand negative electrodes are in contact is avoided.
Description
technical field [0001] The invention relates to the technical field of diaphragm coatings, in particular to a lithium battery diaphragm ceramic slurry with high temperature resistance and a preparation method thereof. Background technique [0002] Separators are an important component in lithium-ion batteries. Lithium battery diaphragm needs to have two aspects of performance, one is to avoid the short circuit of the positive and negative contacts of the battery, and the other is to satisfy the lithium ions during the charging and discharging process of the lithium battery, so as to complete the storage and release of electric energy. The performance of the lithium battery separator plays a very important role in the performance of the lithium battery. The dimensional stability of the separator is an important factor to ensure the safety of the battery. When the battery is operated at sudden abnormal high temperature, good dimensional stability can ensure that the battery ...
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