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A secure lithium icon battery, improving method and making method of its anode slice

A technology of lithium-ion batteries and manufacturing methods, which is applied in the field of safe lithium-ion batteries, and can solve problems such as the safety factor is difficult to meet the standard, the battery cannot pass the short-circuit test, and the current is large.

Inactive Publication Date: 2007-10-17
DONGGUAN NEWPOWER ELECTRIC SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the aluminum foil and the anode diaphragm are short-circuited, the resistance is small and the current is large, resulting in heat generation. At this time, a large amount of heat generated by the current is concentrated here, which is very easy to cause combustion, causing the battery to fail the short-circuit test, and the safety factor is difficult. up to standard

Method used

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  • A secure lithium icon battery, improving method and making method of its anode slice

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Embodiment 1

[0021] See Figure 1, below with AL 2 o 3 , as an example to illustrate the present invention. As mentioned above, the method adopted in the present invention to improve the safety performance of the lithium-ion battery is to increase the resistance of the surface of the anode sheet and reduce the thermal conductivity of the anode, so that the lithium-ion battery can successfully pass the short-circuit test and improve the safety performance of the product. When making this lithium-ion battery, other steps are the same as the current manufacturing process of ordinary lithium-ion batteries, the difference is that the following methods need to be used when making the anode sheet:

[0022] First, make the base of the anode sheet. The anode sheet base includes an anode current collector 11 and a membrane 12 attached thereon with an anode active substance. The anode current collector 11 is generally made of copper foil. The active material is mixed in a solvent to form a homogen...

Embodiment 2

[0035] The present invention will be described below by taking Li2O as an example. As mentioned above, the embodiment is the same as the anode sheet manufacturing process of the above embodiment, and also includes the following three steps:

[0036] First, make the base of the anode sheet. The anode plate base includes an anode current collector and a membrane attached thereon with an anode active substance.

[0037] Next, make a ready-to-coat slurry. Powdered Li2O is mixed with a binder solvent and dissolved in the solvent to form a slurry. Solvent adopts organic solvent. where AL 2 o 3 The mass ratio of mixing with binder is 90-95:10-5.

[0038] Finally, dipping or coating the prepared anode sheet substrate into the slurry, and then drying the anode sheet to evaporate the solvent, so that a layer of slurry film is formed on the surface of the anode sheet substrate. The drying temperature can be selected to dry at room temperature.

[0039] The anode sheet produced in...

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Abstract

The invention relates to a lithium ion battery technology field, in particular to a safe lithium ion battery, improvement method and the manufacturing method of its anode strip. The inventive method of improving the lithium ion battery safety is to raise the facial resistance of the anode strip, and to reduce the thermal conductivity of the anode strip, namely to cover a metal oxide material membrane layer on the anode strip surface of the lithium ion battery for raising the facial resistance of the anode strip and reducing the thermal conductivity of the anode strip. Use of the invention can raise the facial resistance of the anode strip, so after of the cathode current collector is in short circuit with the anode diaphragm, the resistance is greater, its current is smaller, resulting in a reduction of the produced, thereby the manufactured battery may easily pass through the short-circuit test, and the safety factor reaches the standard. At the same time the film layer formed by adopting the metal oxide, has a better hole for passing through lithium ions in its material interior structure, without any influence on the electrochemistry performance of the battery. The lithium ion battery that adopts this invention has a higher safety than the safety performance of the ordinary lithium ion battery.

Description

Technical field: [0001] The invention relates to the technical field of lithium ion batteries, in particular to a safe lithium ion battery, an improvement method and a method for making an anode sheet thereof. Background technique: [0002] short circuit test Anode piece copper foil Anode diaphragm cathode sheet aluminum foil Safety Danger Cathode diaphragm Safety very safe [0003] In the above experiment, the cathode current collector and the cathode diaphragm were directly contacted with the anode current collector and the anode diaphragm in the anode sheet respectively, and then the test results were recorded respectively. According to the results of the above tests, we found that when the cathode current collector (aluminum foil) in the cathode sheet is short-circuited with the anode diaphragm, the temperature of the battery will rise rapidly, smoke will start to occur, and an...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/04H01M10/40H01M4/139H01M10/0525H01M50/431H01M50/489H01M50/491
CPCY02E60/122Y02E60/10
Inventor 赵丰刚胡学山
Owner DONGGUAN NEWPOWER ELECTRIC SCI & TECH
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