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Composite diaphragm and preparation method thereof as well as battery and object with composite diaphragm

A technology for composite diaphragms and objects, applied in the field of objects, composite diaphragms and their preparation, and batteries, to achieve the effects of high surface energy, good hydrophilicity, and improved affinity

Pending Publication Date: 2022-04-19
NINGDE ZHUOGAO NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this application is to provide a composite diaphragm that overcomes the defects of a single electrospun film in the prior art, improves the mechanical strength of the electrospun film, and controls the pore size

Method used

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  • Composite diaphragm and preparation method thereof as well as battery and object with composite diaphragm
  • Composite diaphragm and preparation method thereof as well as battery and object with composite diaphragm

Examples

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Effect test

preparation example Construction

[0043] Finally, the preparation method of above-mentioned composite diaphragm comprises the following steps:

[0044] Preparation of electrospinning film: dry the powdery polymer mixture and add it to the solvent N,N-dimethylformamide, stir it to make it fully dispersed to obtain an electrospinning solution, and perform electrospinning under the electrospinning equipment silk, to prepare the electrospun film. Among them, the electrospinning equipment adopts a spinning rate of 0.2-1.2ml / h, a voltage of 14-20KV, an ambient humidity of ≤30%, and a distance of 10-20cm from the spinning nozzle to the receiving plate. Dry at ℃ for 1-3h / 13.

[0045] Preparation of nano-coating: preparing a mixed solution of DMF and absolute ethanol, adding the LATP nano-material into the mixed solution, stirring and dispersing to prepare the nano-coating. Among them, LAPT nanomaterials are prepared by the following method: Li 2 CO 3 , AlOOH, TiO 2 , NH 4 h 2 PO 4 The powder is added into abso...

Embodiment 1

[0050] 3g of PVDF and 7g of PAN were dissolved in 55g of DMF to prepare a PVDF-PAN spinning solution, and stirred at a constant speed for 24 hours at room temperature to obtain a PVDF-PAN mixture. The spinning rate is 1.2ml / h, the setting voltage is 20KV, the ambient humidity (RH) is ≤30%, the distance between the spinning nozzle and the receiving plate is 20cm, collected by a drum, and dried at 70°C for 2.5h to obtain PVDF-PAN electrospun film.

[0051] According to the molar ratio Li 2 CO 3 :AlOOH:TiO 2 : NH 4 h 2 PO 4 1.3:0.3:1.7:1 was added with absolute ethanol and mixed on a planetary ball mill, and the mixture was dried at 80° C. for 5 hours to obtain a precursor material. The precursor was first heated to 300°C for 2 hours in a muffle furnace at a heating rate of 5°C / min, then heated to 700°C for 4 hours and then naturally cooled to room temperature. The calcined LATP block material was taken out, ground and sieved (100 mesh), you can get LATP[Li 1.3 al 0.3 Ti...

Embodiment 2

[0056] The difference from Example 1 is that 5g of PVDF and 5g of PAN are dissolved in 55g of DMF to prepare a PVDF-PAN spinning solution.

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Abstract

The invention discloses a composite diaphragm and a preparation method thereof, and relates to the technical field of secondary batteries. The electrostatic spinning thin film is used as the base film, the electrostatic spinning thin film is subjected to electrostatic spinning in a mixing and dissolving mode, the polymer mixture has the advantages of being good in hydrophilicity and high in surface energy, and the affinity of the lithium battery diaphragm to electrolyte can be improved. Besides, one side of the electrostatic spinning film is coated with a nano material, the nano material has the characteristic of high room-temperature ionic conductivity, the conductivity of the lithium battery diaphragm can be improved, and meanwhile, the other side of the base film is coated with PVDF slurry, so that the liquid absorption performance and the heat shrinkage resistance of the composite diaphragm are improved.

Description

technical field [0001] The present application relates to the technical field of secondary batteries, in particular to a composite diaphragm, a preparation method thereof, and batteries and objects having the same. Background technique [0002] Lithium-ion battery diaphragm is an important part to ensure the safety performance of lithium-ion batteries. Its main function is to provide microporous channels to conduct lithium ions in the liquid electrolyte while insulating electrons. The structure and performance of the diaphragm have a great influence on the charge and discharge capacity of lithium-ion batteries Cycle life has a big impact. The traditional microporous polyolefin separator has high mechanical properties and good electrochemical stability, but the separator has a high dielectric constant, a porosity of about 40%, a low melting point, and a low liquid absorption rate. The thermal safety performance is not high, and the charge-discharge cycle performance is reduc...

Claims

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Application Information

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IPC IPC(8): H01M50/40H01M50/403H01M50/414H01M50/417
CPCH01M50/40H01M50/403H01M50/414H01M50/417
Inventor 李姗姗王晓明周素霞黄云王婷张振坤曹林娜张云金
Owner NINGDE ZHUOGAO NEW MATERIAL TECH CO LTD
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