Current collector for lithium-ion battery, preparation method of current collector, pole piece for lithium-ion battery and lithium-ion battery

A lithium-ion battery and current collector technology, which is applied in electrode carriers/current collectors, electrode manufacturing, secondary batteries, etc., can solve problems such as temperature increase, lithium-ion battery safety performance degradation, and lithium-ion battery thermal runaway reaction, etc. Achieve the effect of improving safety, slowing down exothermic reaction, and avoiding short-circuit discharge

Inactive Publication Date: 2018-01-19
DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the battery is short-circuited, a large amount of heat will be released inside the battery, causing the temperature to rise, and various side reactions will occur inside the battery, especially when the aluminum foil current collector is in short-circuit contact with the negative electrode in a fully charged state, it is easier to make the lithium-ion battery A thermal runaway reaction occurs, which greatly reduces the safety performance of lithium-ion batteries

Method used

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  • Current collector for lithium-ion battery, preparation method of current collector, pole piece for lithium-ion battery and lithium-ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The lithium ion battery current collector of the present embodiment, such as figure 1 As shown, an aluminum foil 1 with a thickness of 18 μm is included, and a PTC layer 2 is attached to both sides of the aluminum foil 1; the thickness of the PTC layer 2 is 2 μm (single layer thickness).

[0041] The PTC layer 2 contains 98% (mass percent) positive temperature coefficient material, and the balance is PVDF binder; the positive temperature coefficient material is strontium titanate sintered body doped with metal oxide, and the metal oxide Neodymium oxide (Nd 2 o 3 ), the doping amount of metal oxide is 0.1%.

[0042] The preparation method of the lithium ion battery current collector of the present embodiment comprises the following steps:

[0043] 1) Dissolve PVDF binder in N-methylpyrrolidone, then add positive temperature coefficient material powder, the mass ratio of positive temperature coefficient material powder to binder is 98:2, and disperse evenly to make the...

Embodiment 2

[0057] The current collector for lithium-ion batteries of this embodiment (same structure as in Embodiment 1) includes an aluminum foil with a thickness of 18 μm, and a PTC layer is attached to both sides of the aluminum foil; the thickness of the PTC layer is 10 μm (single-layer thickness).

[0058] The PTC layer 2 contains 98% (mass percent) positive temperature coefficient material, and the balance is PVDF binder; the positive temperature coefficient material is a lead titanate sintered body doped with metal oxide, and the metal oxide Nd 2 o 3 and La 2 o 3 , the doping amount of metal oxide is 0.1%.

[0059] The preparation method of the lithium ion battery current collector of the present embodiment comprises the following steps:

[0060] 1) Dissolve PVDF binder in N-methylpyrrolidone, then add positive temperature coefficient material powder, the mass ratio of positive temperature coefficient material powder to binder is 98:2, and disperse evenly to make the solid con...

experiment example

[0074] 1. Make the battery

[0075] 1) Make positive electrode

[0076] Dissolve 2 parts by weight of PVDF (polyvinylidene fluoride) in NMP (N-methylpyrrolidone), prepare a binder slurry, and uniformly mix 1.5 parts by weight of conductive graphite in the binder, 100 parts by weight of LiNi 0.5 co 0.2 mn 0.3 (Positive electrode active material) mixed with conductive paste. Apply the obtained positive electrode slurry on both surfaces of the above-mentioned current collector, that is, the prepared PTC-coated aluminum foil, then dry it, and then roll it and die-cut it, so that the desired positive electrode sheet is obtained. .

[0077] 2) Make the negative electrode

[0078] Dissolve 1.5 parts by weight of CMC (sodium carboxymethylcellulose) in ionized water to prepare a binder slurry, uniformly mix 1.5 parts by weight of conductive graphite in the binder, and mix 100 parts by weight of The negative electrode active material was mixed with the conductive paste, and 2 par...

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Abstract

The invention relates to a current collector for a lithium-ion battery, a preparation method of the current collector, a pole piece for the lithium-ion battery and the lithium-ion battery. The currentcollector comprises aluminum foil; A PTC layer is attached to one side or each of two sides of the aluminum foil; each PTC layer contains a positive temperature coefficient material; the positive temperature coefficient material is a metal oxide-doped strontium titanate sintered body or lead titanate sintered body; and a metal oxide is oxide of any one of Nb, Ta, Bi, Sb, Y and La or combination of oxides. The resistance of the PTC (positive temperature coefficient) layers of the current collector is rapidly increased or even insulated when the internal temperature of the battery rises to a critical point, thereby effectively controlling the temperature of the battery when the lithium-ion battery is charged or discharged at a high rate; and a negative electrode can be effectively preventedfrom being in direct contact with the aluminum foil when the battery is damaged from puncture and the like, thereby avoiding the possibility of short-circuit discharge of the negative electrode and the aluminum foil, retarding exothermic reaction of the battery in a short circuit and further improving the security of the lithium-ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a current collector for lithium-ion batteries and a preparation method thereof, and also relates to a pole piece for lithium-ion batteries and a lithium-ion battery using the current collector. Background technique [0002] As an emerging technology, lithium-ion batteries have many advantages over traditional batteries. In the prior art, lithium-ion batteries have been widely used in various industries. The most prominent representative is that a single lithium-ion battery is used as a power source for mobile phones, while new energy electric vehicles basically use lithium-ion batteries as a power source. Based on the advantages of lithium-ion batteries at home and abroad, they have focused on research and breakthroughs in theory and engineering in recent years, and have basically mastered the application characteristics of the batteries. Although lithi...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M10/0525H01M4/04
CPCY02E60/10
Inventor 杨阳李亚南罗传军赵永锋许飞刘兴福李小涛马明远李莉牛猛卫
Owner DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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