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Electrode assembly

A technology of electrode assembly and battery negative electrode, which is applied in the direction of electrical components, batteries, circuits, etc., and can solve the problem of increasing the initial resistance of the battery

Inactive Publication Date: 2017-06-13
唐忠相
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this causes an increase in the initial resistance of the battery

Method used

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  • Electrode assembly

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (preparation of positive electrode)

[0032] Prepare a slurry by dispersing lithium cobalt oxide, carbon black, and polyvinylidene fluoride (PVDF) in N-methyl-2-pyrrolidone (NMP) and then wrap both sides of the aluminum foil with the slurry cover. The covered aluminum foil was sufficiently dried and then a positive electrode was prepared by pressing the covered aluminum foil.

[0033] (preparation of negative electrode)

[0034] A slurry was prepared by dispersing graphite, acetylene black, and PVDF in NMP and then clad on both sides of the copper foil with the slurry. The coated copper foil was sufficiently dried and then a negative electrode was prepared by pressing the coated copper foil.

[0035] (Space and Diaphragm)

[0036] Bicells were prepared by coating both sides of the separator with PZT at a thickness of about 30 um, after which by using the separator coated on one side at a thickness of about 30 um during winding of 13 bicells (using PLZT), an electro...

experiment example 2

[0038] 1) Initial resistance ： The initial resistance was calculated from the voltage drop when a half-charged cell (SOC50) was discharged at a constant current (50 A), and decreased by about 3% compared to a single cell prepared by using a typical method.

[0039] 2) Battery life ： When the battery life is defined as the time during which the resistance increases by 30% during storage at a constant high temperature, the battery life is comparable to that of a single cell prepared by using a typical method.

[0040] As described above, it can be confirmed that the electrode assembly of the present invention improves the processability of battery production while reducing the initial resistance and having excellent battery life.

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Abstract

An embodiment of the invention provides an electrode assembly. The electrode assembly has a state-winding structure which is used for arranging multiple unit batteries with a stacked structure on a long-sheet type diaphragm; the electrode assembly comprises the unit batteries which are configured from more than two kinds of electrode materials, wherein separating sheets which are stacked on the unit batteries with the stacked structure have a coating material used for coating the two sides thereof, and the long-sheet type diaphragm has a coating material used for coating one side thereof; in the preparation period, the initial resistance is lowered while the machinability of battery preparation is improved; in addition, the electrode assembly has the equivalent battery service life as the conventional battery; and a lithium secondary battery comprising the electrode assembly is disclosed.

Description

technical field [0001] The invention relates to a lithium secondary battery of an electrode assembly. Background technique [0002] Now, with the technological development and increase in demand for various mobile power supply devices, the demand for secondary batteries has also increased dramatically. Among secondary batteries, lithium secondary batteries having high energy density and operating voltage and excellent storage and life characteristics have been widely used as energy sources of various electronic products as well as various mobile devices. [0003] Lithium secondary batteries use metal oxides such as LiCoO as positive electrode active materials and carbon materials as negative electrode active materials. A medium in which lithium ions move between the negative and positive electrodes. The lithium secondary battery must be basically stable within the operating voltage range of the battery, must have high charge and discharge efficiency, and must have the abil...

Claims

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Application Information

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IPC IPC(8): H01M10/04H01M10/0525H01M10/0587
CPCH01M10/045H01M10/0525H01M10/0587H01M2220/10H01M2220/20Y02E60/10Y02P70/50
Inventor 唐忠相
Owner 唐忠相
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