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Lithium-ion secondary battery

A secondary battery and lithium-ion technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as combustion and explosion, short circuit between positive and negative electrodes, and achieve the effect of avoiding combustion and explosion and accelerating heat dissipation

Active Publication Date: 2018-05-22
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the use of lithium-ion secondary batteries, there will be overcharging and continuous heat generation, especially when the lithium-ion secondary battery reaches a high voltage, the positive electrode active material, negative electrode active material and electrolyte will undergo side reactions, resulting in a large amount of heat release. When the heat accumulates to a certain level, there is a risk of combustion and explosion in lithium-ion secondary batteries
However, when the lithium-ion secondary battery is abused by impact, acupuncture, etc. during use, the positive electrode and negative electrode will short-circuit and generate a large amount of heat. When the heat accumulates to a certain extent, the lithium-ion secondary battery will also burn and explode. risks of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Preparation of the negative electrode sheet of the lithium-ion secondary battery

[0033] Add solvent deionized water and thickener sodium carboxymethyl cellulose (CMC) into the stirring grinder to make it dissolve completely under vacuum to obtain an aqueous polymer solution; then add the conductive agent conductive carbon black to the already In the dissolved water-based polymer solution, quickly stir and grind until the fineness is below 5 μm; then add artificial graphite, the negative electrode active material, and stir slowly under vacuum conditions; then add the binder styrene-butadiene latex, and The condition is slowly stirred evenly; after that, the negative electrode slurry is obtained by filtering with a 150-mesh stainless steel screen, wherein the solid content of the negative electrode slurry is 68%; then the negative electrode slurry is evenly coated on the current collector copper foil with a thickness of 8 μm Both sides are dried to obtain a negative...

Embodiment 2

[0045] Lithium-ion secondary batteries were prepared according to the method of Example 1, except for the following differences:

[0046] (6) Preparation of lithium-ion secondary battery

[0047] The coating area of ​​the low melting point coating slurry is 50% of the area of ​​the negative electrode collector not coated with the negative electrode film.

Embodiment 3

[0049] Lithium-ion secondary batteries were prepared according to the method of Example 2, except for the following differences:

[0050] (5) Preparation of low melting point coating

[0051] The shell layer of the core-shell polymer microspheres is made of ethylene acrylamide copolymer with a melting point of 100°C, and the thickness of the shell layer is 0.5 μm. The core layer of the core-shell polymer microspheres is made of polypyrrole. The swelling degree of the polymer microspheres in the electrolyte is 5%.

[0052] (6) Preparation of lithium-ion secondary battery

[0053] Coating the low melting point coating slurry on the surface of the negative electrode current collector that is not coated with the negative electrode film at the end of the winding of the battery cell is close to the end of the negative electrode film.

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Abstract

The invention provides a lithium ion secondary battery. A coating with low melting point is coated on a partial / whole area of at least one surface of an anode current collector without anode diaphragm coated and an opposite cathode current collector without cathode diaphragm coated; the coating with low melting point comprises core-shell polymer microspheres; the core-shell polymer microspheres comprise shell layers which are made of insulating polymers and core layers with conductivity; an isolating membrane is provided with a pore on a position facing the coating with low melting point; when the internal temperature of the lithium ion secondary battery allows the shell layers of the insulating polymer in the coating of low melting point to melt, the anode current collector without anode diaphragm coated and the opposite cathode current collector without cathode diaphragm coated are electrically connected by means of core layers with conductivity. The lithium ion secondary battery has lower deformation and higher safety, and especially can be used as a high capacity battery and a high energy density battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium ion secondary battery. Background technique [0002] Since its commercialization, lithium-ion secondary batteries have been widely used as power sources for various mobile devices due to their high energy density, high operating voltage, no memory effect, long cycle life, and no pollution to the environment. Entered the large-scale practical stage. [0003] With the multi-functionalization and refinement of various portable electronic devices, higher requirements are put forward for the energy density of lithium-ion secondary batteries, and the improvement of energy density of lithium-ion secondary batteries puts forward higher requirements for its safety performance. requirements. During the use of lithium-ion secondary batteries, there will be overcharging and continuous heat generation, especially when the lithium-ion secondary battery reaches a high voltage, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/66
CPCY02E60/10
Inventor 杨建瑞赖旭伦张新枝彭三军江辉
Owner CONTEMPORARY AMPEREX TECH CO
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