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Vinylidene fluoride copolymer particles and use thereof

A technology of vinylidene fluoride and copolymer, which is applied in the field of vinylidene fluoride polymer particles and its utilization, can solve the problems of battery characteristics and battery life reduction, and achieve the effect of improving adhesion

Active Publication Date: 2019-08-23
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is known that in a non-aqueous electrolyte secondary battery, when a gap is generated between an electrode and a separator, there is a problem that battery characteristics and battery life are reduced

Method used

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  • Vinylidene fluoride copolymer particles and use thereof
  • Vinylidene fluoride copolymer particles and use thereof
  • Vinylidene fluoride copolymer particles and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0176] 330 parts by mass of ion-exchanged water as a dispersion medium was placed in the autoclave, and degassed by bubbling nitrogen gas for 30 minutes. Next, 1.0 parts by mass of perfluorooctanoic acid ammonium salt (PFOA) was charged as a surfactant, the pressure was increased to 4.5 MPa, and nitrogen replacement was performed three times. Next, 0.05 parts by mass of ethyl acetate as a chain transfer agent, 35 parts by mass of vinylidene fluoride (VDF), and 8.0 parts by mass of hexafluoropropylene (HFP) as another compound were added to the autoclave. Then, after heating up to 80 degreeC with stirring, the 5 wt% ammonium persulfate aqueous solution as a polymerization initiator was put in the amount equivalent to 0.1 mass part in conversion of ammonium persulfate, and superposition|polymerization was started. After the start of the reaction, when the pressure dropped to 2.5 MPa, 56.9 parts by mass of VDF were continuously added so that the pressure in the tank was maintaine...

Embodiment 2

[0178] Except having used monomethyl maleate (MMM) as the compound containing an oxygen atom, polymerization was carried out similarly to Example 1, and the latex containing a particle was obtained. The obtained latex had a solid content concentration of 20.8 wt % and a particle diameter of 150 nm.

Embodiment 3

[0180] Except having used acryloyloxypropyl succinate (APS) as an oxygen atom containing compound, it polymerized similarly to Example 1, and obtained the latex containing a particle. The obtained latex had a solid content concentration of 21.0 wt % and a particle diameter of 150 nm.

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Abstract

The present invention provides vinylidene fluoride copolymer particles which are capable of efficiently exhibiting high adhesion between an electrode and a separator. These vinylidene fluoride copolymer particles comprise vinylidene fluoride and a compound having a functional group comprising an oxygen atom, and the proportion of the oxygen atoms on the surface of the vinylidene fluoride copolymerparticles is higher than the proportion of the oxygen atoms in locations other than the surface of the vinylidene fluoride copolymer particles.

Description

technical field [0001] The present invention relates to a vinylidene fluoride polymer particle and its utilization. More specifically, it relates to a vinylidene fluoride copolymer particle and a dispersion using the vinylidene fluoride copolymer particle, a coating composition, a separator, Binder composition and secondary battery. Background technique [0002] In recent years, the development of electronic technology has been astounding, and the high functionality of small portable devices has been promoted. Therefore, miniaturization and weight reduction, ie, higher energy density, are required for power supplies used in these devices. As a battery having a high energy density, for example, a nonaqueous electrolyte secondary battery typified by a lithium ion secondary battery or the like is widely used. [0003] From the viewpoint of global environmental issues and energy saving, such non-aqueous electrolyte secondary batteries are also used in hybrid vehicles that comb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/22H01M2/16H01M4/04H01M50/426
CPCC09D127/16C08F214/225C08F14/22Y02E60/10H01M50/461H01M50/426C08F220/06C08F222/16C08F2/001C08F214/22C08F220/26H01M50/411H01M50/449C08K3/04C08K3/22C08K2003/2203C08K2003/2262C08K2003/2289C08K2003/2293
Inventor 冈田佳余子长泽善幸及川彩铃木梦乃小林正太
Owner KUREHA KAGAKU KOGYO KK
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