Lithium ion battery diaphragm, lithium ion battery and manufacturing method thereof

A lithium-ion battery and separator technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, battery pack components, etc., can solve problems such as poor thermal stability, poor electrical performance, and poor electrolyte wettability, and achieve good thermal stability, Excellent long-term cycle performance, high performance, stable electrochemical window

Inactive Publication Date: 2020-02-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the defects of poor wettability, poor thermal stability, and poor electrical performance of the lithium-ion battery separator in the prior art, the present invention provides a lithium-ion battery separator, a lithium-ion battery and a preparation method thereof

Method used

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  • Lithium ion battery diaphragm, lithium ion battery and manufacturing method thereof
  • Lithium ion battery diaphragm, lithium ion battery and manufacturing method thereof
  • Lithium ion battery diaphragm, lithium ion battery and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Preparation of lithium-ion battery separator

[0047] (1) Preparation of slurry: Accurately weigh 0.4g of polyvinylidene fluoride (PVDF) and dissolve in 9.6g of anhydrous N-methylpyrrolidone (NMP), stir at room temperature for 4 hours to obtain a fully dissolved PVDF solution, PVDF mass The score is 4%. Then, mix 1.2g nanometer polyhydrous kaolin (HNT) with the above-mentioned PVDF solution (PVDF and HNT mass ratio 1:3), stir at room temperature for 12 hours, and sonicate for 0.5 hours to ensure that HNT is evenly dispersed in the PVDF solution, and obtain Uniform, white slurry.

[0048] (2) Coating and film making: evenly coat the prepared slurry on both sides of the Celgard 2400 diaphragm with a scraper, and control the coating thickness to 5 μm by selecting a suitable scraper model. After a large amount of solvent is volatilized, place it in a vacuum oven for 50 °C for 12 hours in vacuum, after drying, use a hot press to press under 4MPa pressure for 30 seconds, pu...

Embodiment 2

[0050] The dosage of nano-hydrokaolin (HNT) is 2.4g, so that the mass ratio of PVDF and HNT is 1:6. Other than that, other steps and conditions were the same as those in Example 1 to prepare the lithium-ion battery separator. The lithium-ion battery separator was cut into a disc with a diameter of 16 mm, which was designated as sample 2.

Embodiment 3

[0052] The amount of nano-hydrokaolin (HNT) is 3.6g, making the mass ratio of PVDF and HNT 1:9. Other than that, other steps and conditions were the same as those in Example 1 to prepare the lithium-ion battery separator. The lithium-ion battery separator was cut into a disc with a diameter of 16 mm, which was designated as sample 3.

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Abstract

The invention discloses a lithium ion battery diaphragm, a lithium ion battery and a manufacturing method thereof. The lithium ion battery diaphragm comprises a base membrane and a coating. At least one side of the base membrane is covered by the coating, the coating contains a binder and nanometer hydrated halloysite, a mass ratio of the binder and the nanometer hydrated halloysite is 1: (3-15),and a thickness of the coating is 2.5-15mum. The lithium ion battery diaphragm is good in wettability to an electrolyte, high in liquid absorption rate, good in thermal stability, high in ionic conductivity and stable in electrochemical window. The manufacturing method is simple, and the lithium ion battery has an excellent rate capability and long-term cycle performance.

Description

technical field [0001] The invention relates to a lithium ion battery diaphragm, a lithium ion battery and a preparation method thereof. Background technique [0002] The separator is an important part of lithium-ion batteries, especially those with liquid electrolytes, because it provides a physical barrier between the positive and negative electrodes to prevent short circuits. The separator also acts as a reservoir of electrolyte during the charge and discharge cycles of the battery, and the separator does not directly participate in any battery reactions. However, the research on battery kinetics and battery performance has proved that the structure and properties of the separator play an important role in determining the cycle life, safety performance, energy density and power density of the battery. [0003] Commercial microporous polyolefin separators have problems such as poor electrolyte wettability, poor thermal stability, and serious safety hazards. Due to their ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M10/058
CPCH01M10/0525H01M10/058H01M50/403H01M50/431Y02E60/10Y02P70/50
Inventor刘小孔胡振原
OwnerJILIN UNIV