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Lithium-ion secondary battery

A secondary battery, lithium ion technology, used in secondary batteries, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of no protection device, high short-circuit power, and inability to completely remove impurities or particles, and achieve compensation for irreversible capacity. Loss, reduce the formation of lithium dendrites, and avoid the effect of short circuit inside the battery

Inactive Publication Date: 2010-05-26
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the various safety performances of lithium-ion secondary batteries, the controllability of the internal short circuit of the battery is the worst. The reason is that the internal short circuit of the lithium-ion secondary battery cannot be controlled:
[0004] 1) The introduction of impurities or particles cannot be completely eliminated during the production process;
[0005] 2) When an internal short circuit occurs, due to the large instantaneous short circuit power, the short circuit current will trigger the chemical reaction of the battery within a few seconds, and no protection device can play a role
It turns out that Al 2 o 3 , ZrO 2 Although it can improve the safety performance of lithium-ion secondary batteries, it does not contain inactive components that can store lithium, which seriously affects the cycle performance of lithium-ion secondary batteries.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0043] The preparation of the positive electrode plate: Lithium nickel cobalt manganese oxide (LiNiCoMnO 2 ), conductive carbon black (Super-P), polyvinylidene fluoride (PVDF) and N,N-dimethylpyrrolidone (NMP) at a weight ratio of 94:2:4, mix them evenly to obtain a slurry for coating the positive electrode sheet , The viscosity can be adjusted by NMP during the stirring process. Then, the slurry was uniformly coated with a certain width on both sides of a 14 μm thick positive current collector (aluminum foil), and then cold pressed and sliced ​​(that is, the pole pieces were cut and cut to the required size) to prepare positive electrode sheets.

[0044] The preparation of the negative electrode sheet: the artificial graphite, conductive carbon black (Super-P), sodium carboxymethyl cellulose (water-based binder, CMC), and styrene butadiene rubber (Styrene Butadiene Rubber, SBR) at a weight ratio of 95:1 :1:3 is mixed with deionized water and stirred evenly to obtain a slurry for...

Embodiment 2

[0048] Preparation of the positive electrode plate: Lithium nickel cobalt manganate (LiNiCoMnO 2 ), conductive carbon black (Super-P), and polyvinylidene fluoride (PVDF) are mixed with N,N-dimethylpyrrolidone (NMP) at a weight ratio of 94:2:4, and stir to obtain a slurry for coating the positive electrode sheet. , The viscosity can be adjusted by NMP during the stirring process. Then, the slurry is uniformly coated with a certain width on both sides of a 14 μm thick positive current collector (aluminum foil), and then cold pressed and sliced ​​(ie, the pole pieces are cut and cut to the required size) to prepare positive electrode sheets.

[0049] The preparation of the negative electrode sheet: the artificial graphite, conductive carbon black (Super-P), sodium carboxymethyl cellulose (water-based binder, CMC), and styrene butadiene rubber (Styrene Butadiene Rubber, SBR) at a weight ratio of 95:1 :1:3 is mixed with deionized water and stirred evenly to obtain a slurry for coating...

Embodiment 3

[0053] The preparation of the positive electrode plate: Lithium nickel cobalt manganese oxide (LiNiCoMnO 2 ), conductive carbon black (Super-P), and polyvinylidene fluoride (PVDF) are mixed with N,N-dimethylpyrrolidone (NMP) at a weight ratio of 94:2:4, and stir to obtain a slurry for coating the positive electrode sheet. , The viscosity can be adjusted by NMP during the stirring process. Then, the slurry is uniformly coated with a certain width on both sides of a 14 μm thick positive current collector (aluminum foil), and then cold pressed and sliced ​​(ie, the pole pieces are cut and cut to the required size) to prepare positive electrode sheets.

[0054] The preparation of the negative electrode sheet: the artificial graphite, conductive carbon black (Super-P), sodium carboxymethyl cellulose (water-based binder, CMC), and styrene butadiene rubber (Styrene Butadiene Rubber, SBR) at a weight ratio of 95:1 :1:3 is mixed with deionized water and stirred evenly to obtain a slurry f...

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Abstract

The invention discloses a lithium-ion secondary battery, which comprises a positive plate, a negative plate, an isolation membrane arranged between the positive plate and the negative plate, and electrolyte; the positive plate comprises a positive pole current collector and a positive pole active material distributed on the positive pole current collector; the negative plate comprises a negative pole current collector and a negative pole active material which is distributed on the negative pole current collector; and an oxide layer or a nitride layer which has lithium-storage electro-chemical activity is distributed on the surface of the negative plate. In the invention, because the oxide layer or the nitride layer which is distributed on the negative plate of the lithium-ion secondary battery has lithium-storage electro-chemical activity, the safety property of the lithium-ion secondary battery can be improved, and after 50 times of circulation at normal temperature, the discharging capacity conversation rate of the lithium-ion secondary battery has no difference with that of a normal battery.

Description

Technical field [0001] The invention relates to a lithium ion secondary battery, in particular to a lithium ion secondary battery with good safety performance. Background technique [0002] Lithium-ion secondary battery, as a kind of environmental protection battery, has developed rapidly in recent years due to its advantages of high working voltage, high specific energy and long cycle life. It is used in mobile devices such as notebook computers, digital cameras, mobile phones, MP3 and MP4. The application is more and more extensive. [0003] With the development of mobile devices in the direction of miniaturization and multi-function, higher requirements have been placed on the safety performance of lithium ion secondary batteries. Among the various safety performances of lithium ion secondary batteries, the controllability of the internal short circuit of the battery is the worst. The reason is that the internal short circuit of the lithium ion secondary battery cannot be contr...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/13
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 涂健杨勇龚本利王岳利吴凯陈卫
Owner DONGGUAN AMPEREX TECH
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