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Method for preparing lithium secondary battery and lithium secondary battery prepared using the method

A lithium secondary battery and electrode technology, applied in the field of preparing lithium secondary batteries and using the prepared lithium secondary batteries, can solve problems such as deformation and short circuit of electrode components

Active Publication Date: 2019-01-29
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, as a safety test, when heat is detected at a temperature of 130°C or higher, deformation of the electrode assembly wound in the shape of a jelly roll may occur due to gas generation in the pouch-type lithium ion polymer battery, which may cause cause short circuit
Also, the separator included in the electrode assembly shrinks in the MD direction or the TD direction, so that a hard short or a fine short may occur

Method used

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  • Method for preparing lithium secondary battery and lithium secondary battery prepared using the method
  • Method for preparing lithium secondary battery and lithium secondary battery prepared using the method
  • Method for preparing lithium secondary battery and lithium secondary battery prepared using the method

Examples

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Effect test

preparation example 1

[0081] Preparation Example 1: Preparation of Lithium Secondary Battery

[0082] 1.1: Preparation of the first electrode

[0083] Place 97.2 parts by weight of LiCoO in the solvent N-methylpyrrolidone 2 powder, 1.5 parts by weight of polyvinylidene fluoride and 1.3 parts by weight of carbon black to prepare the first electrode slurry. The first electrode paste was coated on the aluminum electrode substrate to a thickness of about 145 μm using a doctor blade (gap: 170 mm). The aluminum electrode substrate coated with the first slurry was heat-treated in vacuum at a temperature of 100° C. for about 5.5 hours, and then dried. Then, the dried aluminum electrode substrate was pressed using a roll press to prepare a first electrode plate on which a first electrode active material layer was formed, and the first electrode plate was cut into a size of 457mm×65.5mm and a strip shape to prepare the first electrode.

[0084] 1.2: Preparation of the second electrode

[0085] 98 part...

experiment example 1

[0094] Experimental example 1: Heating experiment and safety verification experiment

[0095] Two cycles of formation charge / discharge were performed on the lithium secondary batteries prepared in Example 1 and Comparative Examples 1 and 2 at room temperature. During the formation process, the lithium secondary battery is charged at a constant current of 0.7C until the voltage of the lithium secondary battery reaches 4.35V, and then the lithium secondary battery is discharged at a constant voltage of 4.35V until the current of the lithium secondary battery reaches 0.05 c. Next, the lithium secondary battery was discharged at a constant current of 1.0C until the voltage of the lithium secondary battery reached 2.75V. Then, the lithium secondary battery on which formation charge / discharge was performed was charged at a constant current of 0.5C in the same manner as above, and discharged at a constant current of 0.2C until the voltage of the lithium secondary battery reached 3...

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Abstract

The invention provides a method for preparing a lithium secondary battery and the lithium secondary battery prepared with the method. The method prepares the lithium secondary battery through at least two times of ageing process circulation for a stacked electrode assembly with injected electrolyte. The method comprises a step of performing at least one time of hot press process circulation at the temperature of 95 DEG C or above on the electrode assembly between the ageing process circulations.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2013-0099878 filed with the Korean Intellectual Property Office on Aug. 22, 2013, the entire contents of which are hereby incorporated by reference. technical field [0003] One or more embodiments of the present invention relate to a method of manufacturing a lithium secondary battery and a lithium secondary battery prepared using the method. Background technique [0004] The demand for secondary batteries used in mobile electronic devices for information and communication, including personal digital assistants, cell phones and notebook computers, and electric bicycles or electric cars is rapidly increasing, and according to manufacturing electronic devices of compact size and light weight As a trend, lithium secondary batteries that can be compact, lightweight, and rechargeable at a high capacity are being commercialized. [0005] Among various ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0585Y02E60/10Y02P70/50H01M10/052H01M10/058H01M50/116H01M50/124H01M50/461
Inventor 宋治勋
Owner SAMSUNG SDI CO LTD