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Modified diaphragm, and preparation method and application thereof

A diaphragm and modification technology, applied in the direction of optical devices, instruments, structural parts, etc., can solve the problem of inability to judge the coating coating on the diaphragm surface, and achieve the effect of uniform coating

Active Publication Date: 2021-10-01
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the objectives of the present invention is to provide a modified diaphragm to solve the current problem that it is impossible to judge whether the coating on the surface of the diaphragm is uniform. The modified diaphragm of the present invention can be accurately characterized by the coating on its surface. The uniformity of the coating, and can also increase the affinity of the separator to the electrolyte

Method used

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  • Modified diaphragm, and preparation method and application thereof
  • Modified diaphragm, and preparation method and application thereof
  • Modified diaphragm, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Such as figure 1 As shown, a modified diaphragm includes a base film 1 and a modified layer 2; the modified layer 2 is coated on at least one surface of the base film 1; wherein the modified layer 2 includes a transparent modifier and a carbon dioxide Manganese, the content of manganese dioxide is 0.5mg / mL~5mg / mL.

[0045] Further, the manganese dioxide is prepared by a hydrothermal method, the reaction temperature is 100-180° C., and the reaction time is 5-20 hours. More preferably, the reaction temperature may be 100-110°C, 110-120°C, 120-130°C, 130-140°C, 140-150°C, 150-160°C, or 170-180°C; and the reaction time may be 5 ~6h, 6~8h, 8~10h, 10~12h, 12~14h, 14~16h, or 16~20h. In the preparation of hydrothermal method, the temperature and time of hydrothermal reaction have a great influence on the morphology and particle size of manganese dioxide. Although the reaction temperature is too high, the formation of manganese dioxide nanosheet morphology will be accelerated,...

Embodiment 2

[0075] A method for characterizing the coating uniformity of the diaphragm, which uses a CCD camera to detect the modified diaphragm described in Example 1, and detects the difference in color to characterize the uniformity of the coating of the modified layer 2 in the modified diaphragm sex.

Embodiment 3

[0077] A lithium ion battery, comprising a positive electrode sheet, a negative electrode sheet and a diaphragm spaced between the positive electrode sheet and the negative electrode sheet, the diaphragm is the modified diaphragm described in Example 1.

[0078] Wherein, the active material layer coated on the positive electrode sheet can include but not limited to chemical formula such as Li a Ni x co y mz o 2- b N b (wherein 0.95≤a≤1.2, x>0, y≥0, z≥0, and x+y+z=1, 0≤b≤1, M is selected from one or more combinations of Mn and Al , N is selected from the combination of one or more of F, P, S), the combination of one or more of the compounds shown, the positive active material can also include but not limited to LiCoO 2 , LiNiO 2 、LiVO 2 , LiCrO 2 , LiMn 2 o 4 、LiCoMnO 4 , Li 2 NiMn 3 o 8 、LiNi 0.5 mn 1.5 o 4 、LiCoPO 4 、LiMnPO 4 、LiFePO 4 、LiNiPO 4 、LiCoFSO 4 、CuS 2 , FeS 2 、MoS 2 , NiS, TiS 2 One or more combinations of these. The positive active mate...

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Abstract

The invention provides a modified diaphragm, and a preparation method and an application thereof. The modified diaphragm comprises a base membrane and a modified layer. The modified layer is coated on at least one surface of the base membrane, wherein the modified layer comprises a transparent modifier and manganese dioxide, and the content of the manganese dioxide is 0.5 mg / mL to 5 mg / mL. Compared with the prior art, the modified diaphragm has the advantages that a certain amount of manganese dioxide is added, the color of the manganese dioxide is brown yellow, the brown yellow manganese dioxide is mixed with the transparent modifier, and the problem that the coating uniformity of the transparent modifier cannot be judged due to the fact that the transparent modifier is high in light transmittance and thin in coating layer can be effectively solved; and after themanganese dioxide is added, a CCD camera can detect the coating uniformity through a color difference so that the problem that the coating uniformity of the modified layer is difficult to detect at present is solved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a modified diaphragm and its preparation method and application. Background technique [0002] In the structure of lithium batteries, the separator is one of the key inner components. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A separator with excellent performance plays an important role in improving the overall performance of the battery. The main function of the diaphragm is to separate the positive and negative electrodes of the battery, prevent the two electrodes from contacting and short circuit, and also have the function of allowing electrolyte ions to pass through. For the lithium battery series, since the electrolyte is an organic solvent system, a diaphragm material resistant to organic solvents is required, and a high-stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/431H01M50/443H01M50/449H01M50/489H01M50/403H01M10/0525G01B11/06G01B11/30
CPCH01M50/449H01M50/431H01M50/443H01M50/489H01M50/403H01M10/0525G01B11/303G01B11/0683Y02E60/10
Inventor 余津福符宽黄继兵谢才兴甘婷赵云龙杨山陈杰
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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