Barium sulfate composite diaphragm as well as preparation method and lithium ion battery

A technology of composite diaphragm and barium sulfate, applied in secondary batteries, battery pack parts, circuits, etc., can solve the problems of complex process, easy agglomeration of nano-barium sulfate, poor wettability of diaphragm, etc., to promote transmission and improve electrochemical performance. Effect

Inactive Publication Date: 2015-05-13
JIANGSU HUADONG INST OF LI ION BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The separators in the prior art are generally microporous polyolefin separators, which will shrink when the temperature rises, which will cause a short circuit inside the battery and affect the safety of the battery; and the hydrophobicity of the surface of the microporous polyolefin separator makes the wettability of the separator less Poor, increasing the internal resistance of the battery, affecting the cycle performance and charge-discharge performance of the battery, therefore, the imp

Method used

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  • Barium sulfate composite diaphragm as well as preparation method and lithium ion battery
  • Barium sulfate composite diaphragm as well as preparation method and lithium ion battery
  • Barium sulfate composite diaphragm as well as preparation method and lithium ion battery

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preparation example Construction

[0015] The embodiment of the present invention provides a kind of preparation method of barium sulfate composite diaphragm, it comprises the following steps:

[0016] S1, adding a solution formed by dissolving lithium carboxylate in an organic solvent into a soluble barium salt solution, and mixing to form a first solution;

[0017] S2, providing a soluble sulfate aqueous solution with a pH value of 8-10, adding the soluble sulfate aqueous solution to the first solution, and reacting to form a precipitate;

[0018] S3, the precipitate is separated, washed and dried to obtain nano-barium sulfate with lithium carboxylate groups modified on the surface;

[0019] S4, mixing the nano-barium sulfate and a binder to obtain a mixed slurry, and coating it on the surface of a base film to form a barium sulfate composite diaphragm.

[0020] In this step S1, the Ba of this lithium carboxylate and soluble barium salt 2+ Form a stable barium-lithium carboxylate complex that slowly release...

Embodiment 1

[0044] The solution formed by dissolving 0.01g lithium oleate in 50ml of anhydrous methanol was added to 50ml, 0.5mol / L barium chloride solution, and mixed uniformly for 20 minutes to 30 minutes to form a mixed solution; 50ml, 0.5mol / L The sodium sulfate solution of L is adjusted to a pH value of 8-9 by ammonia water, and slowly added to the above mixed solution, and separated by centrifugation to obtain a precipitate. The precipitate was washed 3 times in deionized water, and finally vacuum-dried in an 80°C drying oven to obtain nano-barium sulfate with lithium carboxylate groups modified on the surface. The particle size of the nano-barium sulfate is 30nm-50nm, and the specific surface area is 19.9m 2 / g.

[0045] Add 1 g of nano-barium sulfate to 20 ml of N-methylpyrrolidone solvent to form a solution, and stir vigorously for 3 hours until the nano-barium sulfate is evenly dispersed. 0.05 g of soluble polyimide was added to the above solution and stirred for 4 hours to fo...

Embodiment 2

[0047] A solution formed by dissolving 0.02g of lithium stearate in 100ml of N,N-dimethylformamide was added to 100ml of 0.5mol / L barium nitrate solution, and mixed uniformly for 20-30 minutes to form a mixed solution; Adjust 100 ml of 0.5 mol / L potassium sulfate solution with dilute sodium hydroxide solution to a pH value of 8-9, slowly add it to the above mixed solution, and separate by centrifugation to obtain a precipitate. The precipitate was washed 3-4 times in deionized water, and finally vacuum-dried in an 80°C drying oven to obtain nano barium sulfate with lithium carboxylate groups modified on the surface. The particle diameter of the nanometer barium sulfate is 50nm-80nm.

[0048] A solution formed by adding 1 g of nano-barium sulfate to 10 ml of N-methylpyrrolidone solvent was stirred for 3 hours until the nano-barium sulfate was uniformly dispersed. 0.116 g of polyvinylidene fluoride was added to the above solution and stirred for 6 hours to form a mixed slurry. ...

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Abstract

The invention relates to a method for preparing a barium sulfate composite diaphragm. The method comprises the following steps: dissolving carboxylic acid lithium into a solution with an organic solvent, and adding into a dissoluble barium salt solution to form a first solution; providing a dissoluble sulfate solution of which the pH value is 8-10, adding the dissoluble sulfate solution into the first solution to react to generate precipitate; separating the precipitate, washing with water, and drying, thereby obtaining nano barium sulfate of which the surface is modified with carboxylic acid lithium groups; mixing the nano barium sulfate with an adhesive so as to obtain mixed slurry, and coating the mixed slurry on the surface of a substrate membrane, thereby obtaining the barium sulfate composite diaphragm.

Description

technical field [0001] The invention relates to a barium sulfate composite diaphragm for lithium ion batteries, a preparation method thereof, and a lithium ion battery using the barium sulfate composite diaphragm. Background technique [0002] A lithium-ion battery mainly includes a positive electrode, a negative electrode, a separator, and an electrolyte. Although the separator of lithium-ion batteries does not participate in the electrochemical reactions in the battery, it is an important component of lithium-ion batteries. The separators in the prior art are generally microporous polyolefin separators, which will shrink when the temperature rises, which will cause a short circuit inside the battery and affect the safety of the battery; and the hydrophobicity of the surface of the microporous polyolefin separator makes the wettability of the separator less Poor, increasing the internal resistance of the battery, affecting the cycle performance and charge-discharge perform...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0525H01M2/14H01M50/403H01M50/417H01M50/42H01M50/426H01M50/446H01M50/451H01M50/491
CPCH01M10/0525Y02E60/10H01M50/403H01M50/417H01M50/451H01M50/491H01M50/426H01M50/42
Inventor尚玉明丁小磊何向明王莉李建军刘榛许志新王要武高剑
OwnerJIANGSU HUADONG INST OF LI ION BATTERY