A kind of reinforced inorganic diaphragm for lithium ion battery and preparation method thereof
A technology for lithium-ion batteries and inorganic diaphragms, applied in secondary batteries, battery pack components, separators/films/diaphragms/spacers, etc., can solve the problem of poor bonding of inorganic particles, lack of mechanical strength and flexibility , unable to meet the requirements of lithium-ion battery assembly and use, etc., to achieve high flexibility, improve mechanical strength and flexibility, excellent electrolyte wettability and high temperature dimensional stability
Inactive Publication Date: 2019-03-12
EAST CHINA UNIV OF TECH
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Problems solved by technology
However, the bonding between inorganic particles is poor, and they do not have sufficient mechanical strength and flexibility to meet the requirements of lithium-ion battery assembly and use.
Method used
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Embodiment 1～3
[0036] Dissolve polyvinylidene fluoride (PVDF), polyacrylonitrile (PAN) and their mixture (PVDF / PAN) at a mass ratio of 1:1 in N,N-dimethylformamide at 80°C to obtain spinning liquid; the quality of the polymer in the spinning solution is 22 parts, and the solvent is 78 parts.
[0037] The above spinning solution was electrospun to prepare polymer nanofibers; the spinning voltage was 15kV.
[0038] Disperse nano-silica with a mass fraction of 0.4 in acetone with a mass fraction of 99.6, and add polyvinylidene fluoride with a mass fraction of 0.04 as a binder to prepare a nano-silica suspension, and ultrasonically treat it for 10 minutes .
[0039] The nano-silicon dioxide suspension is infiltrated into the polymer nanofibers by vacuum filtration, and the mass ratio of the nano-silicon dioxide suspension to the polymer nanofibers is 500 to obtain a reinforced inorganic diaphragm.
[0040] After drying, the reinforced inorganic separator was prepared into a dumbbell-shaped sam...
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Abstract
The invention discloses a reinforced inorganic diaphragm for a lithium ion battery and a preparation method thereof. The reinforced inorganic diaphragm uses inorganic particles as a matrix, and polymer nanofibers run through the inorganic particle matrix to form a reinforced phase. The reinforced inorganic membrane is obtained by infiltrating the suspension of inorganic particles between the polymer nanofibers. The reinforced inorganic separator obtained in the present invention contains a large amount of inorganic particles (mass fraction greater than 65), which fully utilizes the advantages of inorganic particles, thus has excellent electrolyte wettability and high temperature dimensional stability, and greatly improves lithium ion The electrochemical performance and safety of the battery. At the same time, due to the existence of polymer nanofibers, the reinforced inorganic separator has good mechanical strength and flexibility, which can meet the requirements for the assembly and use of lithium-ion batteries.
Description
technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a reinforced inorganic separator for lithium ion batteries and a preparation method thereof. Background technique [0002] The separator is an important component in lithium-ion batteries, and its role is to separate the positive and negative electrodes to prevent short circuits. In order to meet the requirements of high-performance lithium-ion batteries, the separator should at least have the following characteristics: 1) good electrolyte wettability and high liquid absorption rate, and 2) excellent high-temperature dimensional stability. The currently commonly used polyolefin-based microporous separators cannot meet the above characteristics, and the resulting lithium-ion batteries have poor performance. Electrospinning refers to a spinning technique that stretches a polymer solution or melt into fibers under the action of an electrostatic field. The...
Claims
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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/40H01M50/403H01M50/431
CPCH01M10/0525H01M50/40H01M50/403H01M50/409H01M50/431Y02E60/10
Inventor 吕瑞华那兵柳和生
Owner EAST CHINA UNIV OF TECH