Lithium-ion battery and preparation method thereof

A technology of lithium-ion batteries and manufacturing methods, which is applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve problems such as inability to block electronic pathways, limitations, and limited battery safety improvements, and achieve improved cycle performance and high temperature. Preservation performance, guarantee of coating uniformity, and simple preparation method

Active Publication Date: 2016-12-07
BERZELIUS (NANJING) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the carbon layer is a conductive layer, whether it is placed on the surface of the active material layer or on the current collector, it cannot hinder the electronic path under extreme conditions such as acupuncture, extrusion, and heavy impact, so it cannot effectively improve the safety performance of the battery.
[0024] Patent document CN 201310612376.3 discloses a preparation method of zinc oxide or aluminum-doped zinc oxide coated lithium cobalt oxide electrode, and patent documents CN200710119817.0 and CN200710119817.0 respectively disclose a surface coating modification to improve the safety of lithium-ion battery negative electrodes method and a surface coating modification method for improving the safety of lithium-ion battery positive electrodes. The above three inventions are limited by the shape and size of the sample chamber, and have to be plated on very small pole pieces in batches, which cannot be applied on a large scale; at the same time Since the growth of the magnetron sputtering coating is only performed on the surface of the active material layer, the safety improvement of the real battery is very limited, which is not supported by any valid data in the descriptions of the above three inventions
[0025] To sum up, there is currently no good case of combining lithium-ion batteries with magnetron sputtering technology, which not only satisfies large-scale production, but also improves the energy density and safety performance of batteries.

Method used

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  • Lithium-ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Cell preparation:

[0065] (1) homogenate:

[0066] The positive electrode active material lithium cobaltate (LiCoO 2) mixed with conductive agent superconducting carbon black (Super P) and thickener / binder polyvinylidene fluoride (PVDF) in a mass ratio of 97:1.5:1.5, adding an appropriate amount of solvent N-methylpyrrolidone (NMP) , through the high-speed shearing action of the planetary agitator and the high-speed dispersing disc, a stable and uniform fluid with a certain viscosity is formed, which is the positive electrode slurry;

[0067] The negative electrode active material natural graphite (NG, Natural Graphite) and the conductive agent superconducting carbon black (Super P), the thickener carboxymethyl cellulose (CMC) and the binder styrene-butadiene rubber (SBR) at a ratio of 96:1: 1.5:1.5 mass ratio mixing, add appropriate amount of deionized water (H 2 O), the high-speed shear action of the planetary agitator and the high-speed dispersing disc forms a st...

Embodiment 2

[0096] The thickness of the diaphragm was changed to 9 μm, and the others were consistent with Example 1.

[0097] It was tested that the volumetric energy density of the full battery reached 716Wh / L at a charge-discharge rate of 0.5C, and the capacity retention rate of 500 cycles was 86.5%. The discharge capacity of the full battery was measured after it was placed at a high temperature of 85°C for 4 hours. 93.2% of one discharge capacity. The battery was subjected to the acupuncture test, and the result was passed.

[0098] Compared with Example 1, the thickness of the separator in the battery of Example 2 is reduced to 9 μm, so that the thickness of the battery is greatly reduced and the energy density is significantly improved. At the same time, the capacity retention rate, high temperature performance and safety performance are not significantly reduced. The surface of the negative electrode sheet and the area where the current collector is not covered by the electrode m...

Embodiment 3

[0100] Sputter coating (Al 2 o 3 ) is wiped off with a solvent, and the others are consistent with Example 1.

[0101] It was tested that the volumetric energy density of the full battery reached 685Wh / L at a charge-discharge rate of 0.5C, and the capacity retention rate of 500 cycles was 86.2%. 94.4% of one discharge capacity. The battery was subjected to an acupuncture test, and the result was a failure.

[0102] Compared with Example 1, there is a nano-protective layer on the surface of the positive electrode and the negative electrode sheet of Example 3, and the energy density, cycle performance, and high-temperature storage performance of the battery are not greatly affected; and the area where the current collector is not covered by the electrode material There is no nano-protective layer, and the battery fails when it is needled, indicating that the presence of a nano-protective layer in the area of ​​the current collector not covered by the electrode material is als...

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Abstract

The invention relates to a lithium-ion battery and a preparation method thereof. The lithium-ion battery comprises (1) a positive plate, (2) a negative plate, (3) a membrane, (4) an electrolyte and (5) an aluminum-plastic packaging film, wherein surface modification treatment is carried out on at least one of the manufactured positive plate and negative plate in a coiled coating manner; and a layer of nanofilm evenly coats the surface of an electrode material of at least one of the positive plate and the negative plate and an area, which is not covered with the electrode material, of a current collector corresponding to the plate. Meanwhile, the invention discloses preparation methods of the positive plate, the negative plate and the battery. The preparation method of the lithium-ion battery is simple, efficient and good in repeatability; the prepared lithium-ion battery has good cycle performance, high-temperature storage performance and safety performance in extreme cases of puncture and the like; and large-scale production of the high-energy density and high-safety lithium-ion battery can be really achieved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery and a preparation method thereof. Background technique [0002] Since the invention of commercial lithium-ion batteries, the application of lithium-ion batteries has been continuously integrated into people's daily life. Today, electronic products such as smartphones, tablet computers, Bluetooth headsets, and smart watches based on lithium-ion batteries are becoming more and more mature. The rise of electric vehicles, drones, and energy storage base stations has also brought new vitality to the development of lithium-ion batteries. Lithium-ion batteries are composed of positive electrode materials, negative electrode materials, separators, electrolytes, current collectors, tabs, and casings. [0003] Usually, in the manufacturing process of lithium-ion batteries, taking the winding assembly method as an example, it mainly includes the followin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/0525H01M10/058B82Y30/00C23C14/35C23C14/56
CPCB82Y30/00C23C14/35C23C14/562H01M4/13H01M4/62H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 王岑
Owner BERZELIUS (NANJING) CO LTD
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