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Positive pole piece and secondary battery using same

A technology of positive pole piece and positive current collector, applied in the field of secondary batteries, can solve the problems of inability to prevent aluminum foil from being exposed, and inability to completely prevent short circuit of positive electrode current collectors, etc.

Active Publication Date: 2019-04-02
CONTEMPORARY AMPEREX TECH CO
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the perspective of the mechanism of the internal short circuit of the battery cell, the most important thing to prevent the internal short circuit of the lithium-ion battery from being out of control is to avoid the exposure of the positive electrode current collector (aluminum foil). The cross-section is exposed when the aluminum foil is broken, so it is still impossible to completely eliminate the short circuit between the positive electrode current collector and the negative electrode

Method used

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  • Positive pole piece and secondary battery using same
  • Positive pole piece and secondary battery using same
  • Positive pole piece and secondary battery using same

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preparation example Construction

[0047] There are two main methods for the preparation of graft polymers:

[0048] Method 1: A pre-polymerized polymer is activated by chemical or physicochemical methods to generate active centers (represented by *) on the main chain, which can be free radicals, positive or negative ions. Then it initiates the polymerization of monomer M to form a graft copolymer. This method is called the method of grafting on the polymer.

[0049] Method 2: The graft monomer is added while the main chain monomer is polymerized, so that the main chain monomer and the graft modified monomer M are polymerized at the same time to form a graft modified polymer.

[0050] Among them, M is used as a graft-modified monomer, and if it has polymerization reaction functional groups such as C═C, -OH, etc., and the polymerization reaction can occur, the second method can be used. If M itself does not contain a group that can participate in the polymerization reaction, the first method is adopted, that is...

Embodiment 1

[0090] Expansion layer preparation

[0091] After mixing the polymer and the conductive agent, a solvent is added, and after stirring evenly, the extension layer slurry is obtained, and then the extension layer slurry is coated on the surfaces of both sides of the positive electrode current collector, and the extension layers 1-13 are obtained after drying. The oily polymer uses N-methylpyrrolidone as the solvent, and the water-based polymer uses deionized water as the solvent. The positive electrode current collector is made of aluminum foil with a thickness of 12 μm. The types of polymer and conductive agent, the mass ratio of the two added, the thickness of the extended layer, the ratio of the elongation ratio of the extended layer to the positive electrode current collector, and the ratio of the conductivity of the extended layer to the positive electrode current collector are shown in Table 1. In the column of polymer, taking "styrene-butadiene rubber-g-octadecene, 6.3:...

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Abstract

The present invention relates to a positive pole piece. An extension layer containing specific polymer and a conductive agent is arranged between a positive pole current collector and a positive poleactive material layer. The extension layer comprises a polymer and a conductive agent, and the ratio of the extension layer and the extension rate of the positive pole current collector is (2-10):1. When core is abused, the extension layer can prevent the cell from high-power short circuit and cannot reduce the battery capacity.

Description

technical field [0001] The present application relates to the field of secondary batteries, and in particular, to a positive electrode sheet and a secondary battery using the positive electrode sheet. Background technique [0002] Secondary batteries, especially lithium-ion batteries, have the characteristics of small size, high energy, and no pollution, and have been widely used in mobile devices, high-power power equipment (such as electric vehicles), and energy storage power stations. However, how to ensure the safety of lithium-ion batteries has become a major research topic for major lithium battery manufacturers. [0003] When the lithium-ion battery is collided or the battery is invaded by foreign objects, it will cause an internal short circuit in the battery. At present, for lithium-ion batteries, the most serious short-circuit method is the short-circuit between the positive current collector and the negative electrode. In this method, the short-circuit power is e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/667H01M10/0525Y02E60/10
Inventor 武卫忠陈小波
Owner CONTEMPORARY AMPEREX TECH CO
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