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A kind of polyimide, silicon negative electrode sheet and its preparation method and application
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A polyimide, silicon anode technology, applied in battery electrodes, structural parts, electrochemical generators, etc., can solve the problem that the pole piece is difficult to maintain integrity, the cycle performance of lithium batteries is poor, and the large volume of high-capacity anodes cannot be buffered. Expansion and other problems, to achieve the effect of good buffering, good flexibility characteristics, and maintaining integrity
Active Publication Date: 2021-08-13
SHANGHAI ZIJIAN CHEM TECH CO LTD
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[0005] The problem to be solved by the present invention is to overcome the fact that when the existing polyimide is used as the negative electrode binder, it cannot buffer the large volume expansion of the high-capacity negative electrode during the charging and discharging process, and it is difficult to maintain the integrity of the pole piece. Imide is used as a binder for lithium batteries with poor cycle performance and other defects, thus providing a polyimide
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Embodiment 1
[0049] Add (1) (276.5g, 0.5mol), 4,4'-diaminodiphenyl ether (ODA) (100g, 0.5mol), methylpyrrolidone (2746g, solution solid content about 20%) into a three-necked flask, Stir at room temperature, after being completely dissolved, add diphenyl ether tetracarboxylic dianhydride (310g, 1mol), after completely dissolving, react at room temperature for 12 hours, terminate the reaction, and precipitate in methanol to obtain polyimide P1 (650g, molecular weight 62000 , PDI=1.5), which conforms to formula (5), where n=m.
Embodiment 2
[0051] Add (1) (107g, 0.2mol), 4,4'-diaminodiphenyl ether (ODA) (160g, 0.8mol), methylpyrrolidone (2308g, solution solid content about 20%) in a three-necked flask, room temperature Stir, after being completely dissolved, add diphenyl ether tetracarboxylic dianhydride (310g, 1mol), after completely dissolving, react at room temperature for 12 hours, terminate the reaction, and precipitate in methanol to obtain polyimide P2 (536g, molecular weight 59000, PDI=1.4), which conforms to formula (5), where n=4m.
Embodiment 3
[0053] Add (1) (53.5g, 0.1mol), 4,4'-diaminodiphenyl ether (ODA) (180g, 0.9mol), methylpyrrolidone (2174g, solution solid content about 20%) into a three-necked flask, Stir at room temperature, after being completely dissolved, add diphenyl ether tetracarboxylic dianhydride (310g, 1mol), after completely dissolving, react at room temperature for 12 hours, terminate the reaction, and precipitate in methanol to obtain polyimide P3 (522g, molecular weight 65000 , PDI=1.5), which conforms to formula (5), where n=9m.
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Abstract
The invention discloses a polyimide, which is obtained by polymerization of diamine monomers and dianhydride monomers, wherein the diamine monomers at least include monomers represented by formula (1) , wherein, n=5~10; the dianhydride monomer is selected from one or more of the compounds represented by formula (2) or formula (3), wherein, R is a single bond or a divalent organic substituent The molar ratio of the diaminemonomer to the dianhydride monomer is 1:10 to 10:1; the molecular weight of the polyimide is 1,000 to 500,000; the molecular weight distribution index (PDI) is 1.2 to 2.5 . The invention also provides a silicon negative electrode sheet prepared by using the polyimide as a binder. When the silicon negative pole piece is used in a lithium battery, it has a good buffering effect on the huge volume expansion generated during charging and discharging, maintains the integrity of the pole piece, and improves the cycle performance of the battery.
Description
technical field [0001] The invention relates to a polyimide, a silicon negative pole piece, a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, excellent rate and power performance, and long cycle life, and are widely used in daily life. With the continuous expansion of its application fields, higher requirements are put forward for the cycle performance and energy density of lithium-ion batteries. [0003] Binder is an important part of lithium-ion batteries, and its performance will have a great impact on the performance of the battery. Common binders include carboxymethyl cellulose, polyvinylidene fluoride, polyethylene and polysaccharide polymers, polyimide, etc. Among them, polyimide has good mechanical properties and chemical stability. , extremely low dielectric constant and excellent thermal stability, and are used in many fields. [0004] However, when the traditional polyim...
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