A diaphragm, its preparation method and lithium battery

Abstract

A separator provided by the present invention includes a base material and a coating layer, and the raw materials of the coating layer include polyhydric alcohol and / or polyamine, ceramic particles and a coupling agent. The membrane prepared by the invention has good stability.

Description

technical field

[0001] The invention relates to a diaphragm, a preparation method thereof and a lithium battery. Background technique

[0002] With the advancement of technology, the improvement of human needs and application requirements, electrochemical energy storage devices are more and more widely used, and are also developing in the direction of high capacity and high rate. Supercapacitors and secondary batteries have emerged as the times require. From electronic equipment to electric vehicles, which are currently being vigorously promoted, electrochemical energy storage devices occupy an increasingly important position in daily life.

[0003] The basic electrochemical energy storage device is mainly composed of positive and negative electrodes, a separator and an electrolyte filled therein. Among them, the positive and negative electrodes are used to store energy; the electrolyte connects the positive and negative electrodes in the energy storage device, so that ions...

Examples

Embodiment 1

[0044] Raw materials γ-aminopropyltriethoxysilane, butanediol and water are mixed in a mass ratio of 20%:10%:70% to obtain a mixed solution, and the total mass of the raw materials is 1000g; nano-alumina particles, The dispersant polyacrylate and water were mixed in a mass ratio of 50%:2%:48% to obtain 400 g of a nano-alumina dispersion. The nano-alumina dispersion and the catalyst hydrochloric acid are added to the above mixed solution to form a slurry. The above slurry is coated on the surface of the aramid fiber diaphragm, and dried at 80° C. to obtain the diaphragm of the present invention.

[0045] Battery production: the binder polyvinylidene fluoride (PVDF) is dissolved in N-methylpyrrolidone to form a solution, conductive carbon black is added to the above PVDF solution, and stirred to form a uniform suspension; then the ternary positive electrode material (LiMn 1 / 3 co 1 / 3 Ni 1 / 3 o 2 ) was added to the above-mentioned suspension, and stirred to form a slurry; whe...

Embodiment 2

[0049] With embodiment 1, difference is that described catalyzer is ammoniacal liquor. Test results: The capacity retention rate after 713 cycles is 95.4%.

Embodiment 3

[0051] With embodiment 1, difference is that ceramic particle is nanometer Li 4 SiO 4 -B 2 o 3 . Test results: The capacity retention rate after 730 cycles is 96.2%.

technical field

[0001] The invention relates to a diaphragm, a preparation method thereof and a lithium battery. Background technique

[0002] With the advancement of technology, the improvement of human needs and application requirements, electrochemical energy storage devices are more and more widely used, and are also developing in the direction of high capacity and high rate. Supercapacitors and secondary batteries have emerged as the times require. From electronic equipment to electric vehicles, which are currently being vigorously promoted, electrochemical energy storage devices occupy an increasingly important position in daily life.

[0003] The basic electrochemical energy storage device is mainly composed of positive and negative electrodes, a separator and an electrolyte filled therein. Among them, the positive and negative electrodes are used to store energy; the electrolyte connects the positive and negative electrodes in the energy storage device, so that ions...

Examples

Embodiment 1

[0044] Raw materials γ-aminopropyltriethoxysilane, butanediol and water are mixed in a mass ratio of 20%:10%:70% to obtain a mixed solution, and the total mass of the raw materials is 1000g; nano-alumina particles, The dispersant polyacrylate and water were mixed in a mass ratio of 50%:2%:48% to obtain 400 g of a nano-alumina dispersion. The nano-alumina dispersion and the catalyst hydrochloric acid are added to the above mixed solution to form a slurry. The above slurry is coated on the surface of the aramid fiber diaphragm, and dried at 80° C. to obtain the diaphragm of the present invention.

[0045] Battery production: the binder polyvinylidene fluoride (PVDF) is dissolved in N-methylpyrrolidone to form a solution, conductive carbon black is added to the above PVDF solution, and stirred to form a uniform suspension; then the ternary positive electrode material (LiMn 1 / 3 co 1 / 3 Ni 1 / 3 o 2 ) was added to the above-mentioned suspension, and stirred to form a slurry; whe...

Embodiment 2

[0049] With embodiment 1, difference is that described catalyzer is ammoniacal liquor. Test results: The capacity retention rate after 713 cycles is 95.4%.

Embodiment 3

[0051] With embodiment 1, difference is that ceramic particle is nanometer Li 4 SiO 4 -B 2 o 3 . Test results: The capacity retention rate after 730 cycles is 96.2%.

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