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Electrode plate and lithium ion battery comprising same

A lithium-ion battery and electrode sheet technology, applied in secondary batteries, non-aqueous electrolyte battery electrodes, circuits, etc., can solve problems such as short maintenance cycle, diaphragm folds, and metal burrs left at the cutting position, and achieve a smooth appearance , good elongation, and the effect of avoiding capacity loss

Active Publication Date: 2015-03-25
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the current collector is copper foil, aluminum foil or stainless steel foil. These metal foils are affected by the intrinsic mechanical properties and the state of the slitting equipment during the slitting process, which will leave defects such as metal burrs at the slitting place
If this kind of metal burr is not dealt with, it will cause the lithium ion battery separator to be pierced when assembled into the lithium ion battery, and the cathode and anode will be short-circuited, which will eventually lead to serious consequences such as heat, smoke or fire and explosion of the battery due to the internal short circuit.
In addition, before the diaphragm is assembled into the battery, it must go through the diaphragm compaction process, which will cause the entire diaphragm to stretch
Due to the difference in material properties, if the extension of the cathode or / and anode diaphragm and the insulating layer coverage area is too different, it will cause the diaphragm to wrinkle, causing poor appearance of the diaphragm and poor internal interface of the cell
At the same time, in the actual production process, if the filler hardness of the insulating layer is too high, the cold pressure roller will be fatigued during cold pressing, and the maintenance cycle is very short.

Method used

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  • Electrode plate and lithium ion battery comprising same
  • Electrode plate and lithium ion battery comprising same
  • Electrode plate and lithium ion battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 Preparation of electrode sheets

[0043] Preparation of positive electrode active material slurry: the active material lithium iron phosphate, binder PVDF (polyvinylidene fluoride), and conductive carbon black are mixed, and the mixture is uniformly dispersed by high-speed stirring to form a mixture containing the positive electrode active material. In the mixture, the solid component contains 90wt% lithium iron phosphate, 5wt% PVDF and 5wt% conductive carbon black. The mixture uses NMP (N-methylpyrrolidone) as a solvent to prepare positive electrode active material slurry, and the solid content in the slurry is 40 wt%.

[0044]Preparation of negative electrode active material slurry: mix the active material artificial graphite, binder SBR (styrene-butadiene latex), sodium carboxymethyl cellulose and conductive carbon black, and disperse evenly through high-speed stirring to form a mixture containing negative active material . In the mixture, the solid compo...

Embodiment 2

[0052] Example 2 Preparation of lithium ion battery

[0053] The diaphragm of the lithium-ion battery is an 8 μm polypropylene diaphragm, the electrolyte is a lithium hexafluorophosphate electrolyte containing 1M, and the solvent is a mixture of ethylene carbonate / dimethyl carbonate / 1,2 propylene glycol carbonate-1:1:1 (volume ratio) solvent.

[0054] The positive electrode sheet, separator, and negative electrode sheet prepared in Example 1 are sequentially stacked to form a layered structure to form a bare cell, and after packaging, liquid injection, chemical formation and other processes, a stacked lithium-ion battery or roll Winding lithium-ion battery.

[0055] The relationship between the serial number of the lithium-ion battery and the battery type, the positive pole piece used and the negative pole piece used is shown in Table 2.

[0056] Table 2

[0057] battery number

Embodiment 3

[0058] Embodiment 3 Test of battery capacity

[0059] Take out 20 lithium-ion batteries S1~S4 and D1, D2 obtained in embodiment 2 respectively according to carry out room temperature capacity test, same size battery, the capacity average value of the battery of different groups is as follows image 3 shown.

[0060] Combining Table 1 and image 3 From the data, it can be seen that the battery capacity of the S1-S4 groups adopting the technical solution of the present application is higher than that of the D1 and D2 groups. Since the solid insulating material in the insulating layer of the electrode sheets used in groups D1 and D2 is Al with high hardness 2 o 3 (Mohs hardness level 9), TiO 2 (Mohs hardness 6-7), in the compaction process of lithium-ion batteries, Al 2 o 3 and TiO 2 The prepared insulating layer, because the filled ceramic particles are relatively hard, is not prone to inter-particle slippage and particle breakage, resulting in a relatively small elongati...

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Abstract

The invention relates to an electrode plate and a lithium ion battery comprising the same. The electrode plate comprises a current collector, an electrode diaphragm and an insulation layer; the electrode diaphragm comprises an electrode active substance; the insulation layer comprises solid insulation padding with the mohs hardness being less than or equal to 5; the insulation layer at least covers an area, which is not covered by the electrode diaphragm, of the surface of the current collector. By adopting the insulation layer, the safety problem caused by the piercing of burrs of the current collector to the diaphragm can be avoided; the insulation layer also has the good extension rate and the good effect on transferring the rolling pressure, the flat appearance of the electrode plate in rolling can be guaranteed, a good fitting interface of the electrode plate inside a cell also can be guaranteed, and the capacity loss of the lithium battery in the charging and discharging processes can be reduced.

Description

technical field [0001] The application relates to an electrode sheet and a lithium ion battery containing the electrode sheet, belonging to the field of clean energy. Background technique [0002] Lithium-ion batteries have the advantages of large capacity, high energy density, small size, light weight, and environmental protection. They have been widely used in digital electronic products and electric vehicle industries. [0003] The production process of lithium-ion batteries inevitably involves the diaphragm cutting process and the diaphragm compaction process. Generally, the current collector is copper foil, aluminum foil or stainless steel foil. These metal foils are affected by their intrinsic mechanical properties and the state of the cutting equipment during the cutting process, which will leave defects such as metal burrs at the cutting place. If this kind of metal burr is not dealt with, it will cause the lithium ion battery separator to be pierced when assembled ...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M10/0525
CPCH01M4/13H01M10/0525Y02E60/10
Inventor 杨建青刘坤郭超
Owner DONGGUAN AMPEREX TECH
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