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A diaphragm and a high-voltage battery including the diaphragm

A diaphragm and coating layer technology, applied in the diaphragm field of high-voltage battery systems, can solve the problems of deteriorating battery cycle and rate discharge, adverse effects on electrical performance, and increasing diaphragm manufacturing costs, so as to improve battery safety performance and stabilize the surface of the positive electrode Structure, the effect of improving battery performance

Active Publication Date: 2021-09-28
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The metal particles precipitated on the surface of the negative electrode, on the one hand, produce metal dendrites that are easy to pierce the separator and cause a short circuit inside the battery; on the other hand, they affect the normal insertion of lithium ions and affect the long-term cycle performance of the battery.
[0004] Due to the above-mentioned problems in the precipitated magnetic metal particles or metal ions (including transition metal ions), it has been reported in the prior art that the transition metal ions are adsorbed by using porous ceramic particles. High enough to adversely affect electrical performance
It has also been reported in the prior art to add a transition metal ion adsorption layer on the surface of the ceramic diaphragm. This method not only increases the manufacturing cost of the diaphragm, but also deteriorates the ion conductivity due to the addition of the transition metal ion adsorption layer, which deteriorates the battery cycle and Performance such as rate discharge

Method used

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  • A diaphragm and a high-voltage battery including the diaphragm
  • A diaphragm and a high-voltage battery including the diaphragm
  • A diaphragm and a high-voltage battery including the diaphragm

Examples

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preparation example Construction

[0059] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0060] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0062] Dissolve 20 parts of the modified material in ethanol by stirring to form a mixed solution, add 200 parts of aluminum oxide, stir and mix evenly, remove the solvent in the mixture by vacuum heating and drying technology, and obtain the modified material coated ceramic material particles, the modified material is selected from 3-aminopropyltrimethoxysilane substituted with ethylenediaminetetraacetic acid.

[0063] In the prepared ceramic particles, the shell is a modified material containing 3-aminopropyltrimethoxysilane substituted with ethylenediaminetetraacetic acid, and the core is aluminum oxide; the mass ratio of the shell to the core is 20 :200, the thickness of the shell layer is 10nm, and the average particle size of the ceramic particles is about 0.8μm.

[0064] 80 parts of the ceramic particles prepared above, 20 parts of polyvinylidene fluoride-hexafluoropropylene and 2 parts of polyethylene glycol were added to 900 parts of N,N-dimethylacetamide, and mixed u...

Embodiment 2

[0068] Dissolve 20 parts of the modified material in ethanol by stirring to form a mixed solution, add 200 parts of boehmite, stir and mix evenly, remove the solvent in the mixture by vacuum heating and drying technology, and obtain a modified material-coated ceramic material. Particles, the modifying material is selected from 3-aminopropyltrimethoxysilane substituted with hydroxyethylethylenediaminetriacetic acid.

[0069] In the prepared ceramic particles, the shell is a modified material containing 3-aminopropyltrimethoxysilane substituted by hydroxyethylethylenediaminetriacetic acid, and the core is boehmite; the mass ratio of the shell to the core is The ratio is 20:200, the thickness of the shell layer is 10nm, and the average particle size of the ceramic particles is about 0.8μm.

[0070] The preparation method of the diaphragm and the lithium ion battery is the same as that of Example 1, except that the ceramic particles prepared above are used.

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Abstract

The invention provides a diaphragm and a high-voltage battery comprising the diaphragm. The present invention coats a modified layer on the surface of the inorganic ceramic particles, and the modified layer can absorb the transition metal ions precipitated from the electrode material, so as to prevent the transition metal ions from forming transition metal precipitates on the surface of the negative electrode and improve the safety of the battery. performance, rate performance and cycle performance. At the same time, since the modified layer is coated on the surface of the inorganic ceramic particles, it does not significantly affect the internal resistance of the battery, thereby not reducing the rate, low temperature and cycle performance of the battery. Not only that, the inventors also unexpectedly found that the introduction of the modified material can also achieve the adsorption of a small amount of HF generated in the battery system. On the one hand, it can inhibit the dissolution of transition metal ions, stabilize the surface structure of the positive electrode, and improve battery performance; On the other hand, it can reduce the corrosion of HF to the battery outsourcing material and improve the safety performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a separator suitable for a high-voltage battery system and a battery comprising the separator. Background technique [0002] With the popularity of 3C products and the rise of the electric vehicle market, the demand for lithium-ion secondary batteries is getting higher and higher. Due to the inevitable doping of some magnetic metal particles or metal ions in the entire battery system, these magnetic metal particles or metal ions will be precipitated on the surface of the negative electrode during the charging and discharging process of the battery; in addition, the positive electrode material itself also has transition metal ions eluted In some cases, the dissolved transition metal ions will also precipitate on the surface of the negative electrode; especially in high-voltage battery systems, such precipitation is more serious. [0003] The metal partic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/443H01M50/434H01M50/403H01M10/0525C01F7/02H01M50/451H01M50/489
CPCH01M10/0525C01F7/021C01P2004/62H01M50/431H01M50/446H01M50/403H01M50/414H01M50/434H01M50/443H01M50/451H01M50/489C04B35/10C04B35/62802C04B35/62894C04B35/62897C04B2235/5445C04B2235/5436C04B2235/5454C04B35/62655C04B35/04C04B35/111C04B2235/3218C04B2235/3217C04B2235/3206C04B2235/3208C04B2235/3284C04B2235/3279C04B2235/3418C04B2235/3236C04B2235/3826C04B2235/448C04B35/468C04B35/453C04B35/057C04B35/14C04B35/565Y02E60/10
Inventor 张祖来李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD