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Separator comprising density-controlled coating and battery comprising same

A separator and coating technology, applied in the field of separators including density-controlled coatings and batteries including the separators, can solve the problems of deterioration of separator adhesion, difficulty in preventing short circuits, and reduced coating force, and achieve excellent prevention, The effect of increasing the service life and strong adhesion

Active Publication Date: 2016-11-30
CHEIL IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the amount of inorganic particles is increased in order to obtain sufficient heat dissipation, the amount of inorganic binder in the coating is relatively reduced, thus deteriorating the adhesion of the separator
[0008] In this case, the adhesion between the coating and the electrodes is weakened, so the force of the coating that suppresses the thermal shrinkage of the base film decreases, making it difficult to prevent a short circuit between the positive and negative electrodes after the battery is overheated

Method used

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  • Separator comprising density-controlled coating and battery comprising same
  • Separator comprising density-controlled coating and battery comprising same

Examples

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Embodiment 1 to 4

[0096] Including the weight average molecular weight 1,000,000g / mol The above polyvinylidene fluoride homopolymer and average particle size are 700nm The following inorganic particles and the density is 1.2g / m 3 Preparation of the above coated diaphragm

Embodiment 1

[0098] (1) Preparation of coating agent

[0099] 1) Add polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP) copolymer (21216, Solvay) with a weight average molecular weight of 700,000 g / mol to acetone (Daejung Chemicals & Metals), add 10wt%, and stir The reactor was stirred at 25°C for 4 hours to prepare the first polymer solution,

[0100] 2) Add a polyvinylidene fluoride ("PVdF") homopolymer (5130, Solvay) with a weight average molecular weight of 1,100,000 g / mol to DMF (Daejung Chemicals & Metals), the addition amount is 10wt%, and then use a stirrer at 25 Stir at °C for 4 hours to prepare the second polymer solution,

[0101] 3) Put Al 2 O 3 The particles (LS235, Nippon Light Metal, Ltd.) were added to acetone (Daejung Chemicals & Metals) in an amount of 25wt%, and then ground and dispersed with a bead mill at 25°C for 3 hours to prepare an inorganic dispersant.

[0102] Mix the prepared first polymer solution, second polymer solution and inorganic dispersant in the following ...

Embodiment 2

[0106] The separator was prepared in the same manner as in Example 1, except that the inorganic particles were dispersed for 2 hours to prepare the inorganic dispersant in (1) of Example 1.

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Abstract

Disclosed herein is a separator including a density-controlled coating and a battery including the same. The separator consists of a coating agent formed on a base film with a density of 1.2 g / m 3 to 2g / m 3 Coatings in between, this coating agent contains polyvinylidene fluoride homopolymer and inorganic particles with an average particle size between 1 nm and 700 nm, providing a thin structure while ensuring high peel strength and strong adhesion to the electrode. focus. The battery has high stability and long service life.

Description

Technical field [0001] The present invention relates to a separator including a coating, and a battery including the separator. Background technique [0002] The separator used in an electrochemical battery refers to an intermediate layer provided in the battery, which isolates the positive electrode and the negative electrode from each other while maintaining ionic conductivity to allow charging and discharging of the battery. [0003] Recently developed electrochemical batteries have a lighter and thinner structure to improve the portability of electronic devices, such as mobile devices and notebook computers, while ensuring high output and high capacity for use in electric vehicles and the like. Therefore, the separator of the battery is required to be thin in thickness and light in weight, while ensuring high adhesion and shape stability based on high thermal resistance in order to produce a high-capacity battery. [0004] For example, Korean Patent No. 0775310 discloses a separ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16
Inventor 洪起哲都在九林建子郑准镐
Owner CHEIL IND INC
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