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Lithium ion battery and preparation method thereof

A technology of lithium-ion batteries and batteries, which is applied in the manufacture of electrolyte batteries, batteries, secondary batteries, etc., and can solve problems affecting the high-temperature storage performance of batteries

Active Publication Date: 2014-03-12
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the technical problems that the SEI film of the negative electrode of the existing battery is decomposed under high temperature conditions, which affects the liquid absorption capacity of the electrode, the rate charge and discharge characteristics of the battery, the high temperature cycle capacity retention rate, and the high temperature storage performance of the battery, a technical problem is provided. A lithium-ion battery with good rate charge and discharge characteristics, high high-temperature cycle capacity retention rate, excellent high-temperature storage performance of the battery, and more ideal safety performance, and a preparation method thereof

Method used

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Examples

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preparation example Construction

[0020] The present invention also provides a preparation method for the above-mentioned battery, the steps include: S1, preparation of the electrode group: the negative electrode / diaphragm / positive electrode is wound or stacked to prepare the electrode group, wherein a porous layer is also separated between the negative electrode and the diaphragm, The porous layer includes ceramic particles and a binder, the ceramic particles include aluminum oxide and silicon oxide, based on the mass percentage of the ceramic particles, the content of the aluminum oxide is 70-90wt%, and the silicon oxide The content of the aluminum oxide is 10-30wt%, the average particle size of the aluminum oxide particles is 200nm-700nm, the average particle size of the silicon oxide particles is 200nm-500nm, and the above-mentioned ceramic particles can be obtained commercially. The method for forming the electrode group by winding or stacking has no special requirements in the present invention, and can b...

Embodiment 1

[0056] (1) Preparation of negative electrode sheet

[0057] Mix and stir 100 grams of water and 1 gram of CMC2000 (sodium hydroxymethyl cellulose 2000) until the viscosity of the mixed solution changes less than 3% within 10 minutes, then add 3 grams of microspherical superconducting carbon black with a particle size of 6.5 μm Stir until the viscosity of the mixture changes less than 3% within 10 minutes, then add 70 grams of natural graphite and stir for 1 hour until the viscosity of the mixture changes less than 5%, and finally add 2.5 grams of BM400 (styrene-butadiene rubber) and stir until uniform to obtain a negative electrode slurry. The negative electrode slurry is evenly coated on a copper foil with a width of 400 mm and a thickness of 10 microns, with a coating thickness of 140 microns, vacuum-dried at 100 ° C for 5 hours, and after rolling, it is cut on a slitting machine to obtain a size of 544 mm. mm x 45 mm x 105 µm for the negative electrode.

[0058] (2) Prepar...

Embodiment 2

[0068] (1) Preparation of negative electrode sheet

[0069] Mix and stir 100 grams of water and 1 gram of CMC2000 (sodium hydroxymethyl cellulose 2000) until the viscosity of the mixed solution changes less than 3% within 10 minutes, then add 3 grams of microspherical superconducting carbon black with a particle size of 6.5 μm Stir until the viscosity of the mixture changes less than 3% within 10 minutes, then add 70 grams of natural graphite and stir for 1 hour until the viscosity of the mixture changes less than 5%, and finally add 2.5 grams of BM400 (styrene-butadiene rubber) and stir until uniform to obtain a negative electrode slurry. The negative electrode slurry is evenly coated on a copper foil with a width of 400 mm and a thickness of 10 microns, with a coating thickness of 140 microns, vacuum-dried at 100 ° C for 5 hours, and after rolling, it is cut on a slitting machine to obtain a size of 544 mm. mm x 45 mm x 105 µm for the negative electrode.

[0070] (2) Prepar...

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Abstract

The present invention provides a lithium ion battery and a preparation method thereof. The lithium ion battery comprises a housing, an electrode set and an electrolyte, wherein the electrode set and the electrolyte are sealed inside the housing, the electrode set comprises a positive electrode, a negative electrode and a separation membrane positioned between the positive electrode and the negative electrode, a porous layer is arranged between the negative electrode and the separation membrane, and comprises ceramic particles and a binder, the ceramic particles comprise 70-90 wt% of alumina and 10-30 wt% of silica, the average particle size of the alumina is 200-700 nm, and the average particle size of the silica is 200-500 nm. The prepared battery has characteristics of good rate charge and discharge property, high high-temperature cycle capacity retention rate, excellent high-temperature storage performance and ideal safety performance.

Description

technical field [0001] The invention relates to the field of batteries, in particular, the invention relates to a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries are currently widely used secondary batteries, which have the advantages of high specific energy, high working voltage, low self-discharge rate, long cycle life, and no pollution. Widely used in electric tools, electric vehicles and other fields, there are important requirements for its safety performance. [0003] When the lithium-ion battery is stored in an extremely high temperature environment for a long time or under long-term use or abuse, the separator is easy to shrink or be destroyed, and the positive and negative electrodes will actually contact each other to generate an internal short circuit. The trend of lithium-ion battery capacity also has the risk of lithium dendrites piercing the diaphragm. Once an internal short circuit occurs, the battery ...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/058
CPCY02E60/122H01M10/0525H01M10/058H01M2200/00H01M50/446H01M50/461Y02E60/10Y02P70/50
Inventor 鲍添增陈珍贞马爱丽张闪闪
Owner BYD CO LTD
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