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Composite diaphragm, preparation method thereof, and lithium ion battery

A technology of composite diaphragm and diaphragm, applied in secondary batteries, battery pack parts, circuits, etc., can solve the problems of high dispersion and difficult dispersion, reduce surface energy, improve ionic conductivity, and high rate performance. Effect

Active Publication Date: 2017-11-10
JIANGSU HUADONG INST OF LI ION BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Experiments have shown that most of the commercially available inorganic nanoparticles are not easy to disperse, even after ultrasonic and subsequent ball milling treatment, the effect of high dispersion cannot be achieved. Regardless of the composition of the polymer and the amount of nanoparticles added, the nanoparticles are easy to Separation from the matrix

Method used

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  • Composite diaphragm, preparation method thereof, and lithium ion battery
  • Composite diaphragm, preparation method thereof, and lithium ion battery
  • Composite diaphragm, preparation method thereof, and lithium ion battery

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preparation example Construction

[0013] The embodiment of the present invention provides a method for preparing a composite diaphragm, which includes the following steps:

[0014] S1, preparing nano barium sulfate modified with lithium carboxylate groups on the surface;

[0015] S2, preparing a composite gel; and

[0016] S3, composite the composite gel and the diaphragm base material to obtain a composite diaphragm.

[0017] Specifically, this step S1 includes:

[0018] S11, adding a solution formed by dissolving lithium carboxylate in an organic solvent to a soluble barium salt aqueous solution, and mixing to form a first solution;

[0019] S12: Provide a soluble sulfate aqueous solution with a pH value of 8-10, and add the soluble sulfate aqueous solution to the first solution to react to generate a precipitate;

[0020] S13, separating the precipitate, washing with water, and drying to obtain nano-barium sulfate whose surface is modified with lithium carboxylate groups;

[0021] In this step S11, the lithium carboxyla...

Embodiment （

[0052] Example (1) Preparation of nano barium sulfate

Embodiment 1

[0054] The solution formed by dissolving 0.01g lithium oleate in 50ml anhydrous methanol is added to 50ml, 0.5mol / L barium chloride solution, and uniformly mixing for 20 to 30 minutes to form a mixed solution; add 50ml, 0.5mol / L The sodium sulfate solution of L is adjusted to a pH value of 8-9 with ammonia water, and is slowly added to the above mixed solution, and the precipitate is obtained by centrifugal separation. The precipitate was washed 3 times in deionized water, and finally dried in a vacuum oven at 80° C. to obtain nano barium sulfate modified with lithium carboxylate groups. See figure 1 The particle size of the nano barium sulfate particles is relatively small, about 30 nm to 50 nm, a certain gap is formed between the nano barium sulfate particles and the particles, and each nano barium sulfate particle contains mesopores. It is 6nm-10nm. The specific surface area of ​​the nano barium sulfate is about 19.9m 2 / g.

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Abstract

The invention relates to a composite diaphragm, comprising a diaphragm base material and a composite gel compounded with the diaphragm base material, the composite gel comprising a gel polymer and surface-modified lithium carboxylate groups dispersed in the gel polymer group of nano barium sulfate. The invention also relates to a preparation method of the composite diaphragm and a lithium ion battery.

Description

Technical field [0001] The invention relates to a composite diaphragm for a lithium ion battery, a preparation method thereof, and a lithium ion battery using the composite diaphragm. Background technique [0002] Gel electrolyte, also called gel polymer electrolyte, is a composite of polymer and electrolyte. The electrolyte is wrapped in a network formed by the polymer to form a gel. Lithium-ion batteries using gel polymer electrolytes are commonly known as gel polymer batteries. [0003] Compared with traditional liquid electrolytes, gel polymer electrolytes have the advantages of non-leakage, high flexibility, and high physical and chemical stability, but they also have some disadvantages, such as low mechanical strength, low ion conductivity, and battery charge and discharge. There is a certain gap in rate performance compared with liquid electrolyte batteries, so its applications are mostly limited to the field of digital batteries used at low rates. In the field of power ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0565H01M10/056H01M10/0525H01M50/403H01M50/406H01M50/417H01M50/42H01M50/426H01M50/443H01M50/446H01M50/451H01M50/491H01M50/497
CPCH01M10/0525H01M10/056H01M10/0565H01M50/403H01M50/451H01M50/491H01M50/497H01M50/42H01M50/426H01M50/417H01M50/406Y02E60/10H01M50/446
Inventor 尚玉明丁小磊何向明王莉王要武李建军高剑
Owner JIANGSU HUADONG INST OF LI ION BATTERY
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